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PolyU research reveals major healthcare and communication challenges for migrant domestic workers in Hong Kong

Migrant domestic workers support many Hong Kong working families in childcare and household duties but their own personal needs seldom receive significant attention. The Department of English and Communication at The Hong Kong Polytechnic University (PolyU) has conducted research into the health and other structural issues faced by migrant domestic workers in Hong Kong, especially during the COVID-19 pandemic. Findings reveal that health literacy and access to information and facilities are crucial to their well-being. The researchers have interviewed more than 700 Filipino and Indonesian migrant domestic workers and surveyed more than 400 to investigate their life stories and well-being in Hong Kong, covering topics from narratives about their (traumatic) experiences, health literacy and healthcare needs to their communication networks. In view of the increasing number of workers driven by growing demand for domestic elderly care in Hong Kong, these studies aimed to highlight the significance of cultivating favourable conditions for workers. Prof. Hans LADEGAARD, Professor of the Department of English and Communication at PolyU, said, “Our research shows that Indonesian workers, in particular, face marginalisation and isolation due to language and communication problems and a lack of awareness of their rights. Many took only a three-week Cantonese course before arrival, which clearly does not guarantee their Cantonese proficiency, while most of them are also unable to speak English. Many workers even do not know it is illegal to be paid under the minimum wage or that they are entitled to have 24 hours off once a week. Therefore, it is crucial to prioritise efforts to provide language learning support and to educate these workers about their rights.” Inadequate access to health facilities and information is one major challenge facing these workers. According to Prof. Ladegaard’s research, when the COVID-19 pandemic-induced loneliness, isolation and homesickness put them at higher risk of experiencing depression and anxiety, they only had limited access to support. To address the issue, the team advised that health campaigns be conducted in a language that the workers can understand and that accessible channels such as social media are mobilised for promotion. The research also indicated utilising cartoons and storytelling to be more effective in communicating with migrant populations. Another research study, led by Dr Jeffry OKTAVIANUS, Assistant Professor of the Department of English and Communication, found that community storytelling networks, including interpersonal relationships, community organisations and media outlets, played an essential role in supporting the migrant domestic workers in coping during the pandemic. His research has been published in the journal Health Communication. The study revealed that many workers could not obtain knowledge about effective preventive measures during the pandemic, due to the absence of reliable and accurate information in their native language. Interaction with workers’ communities on social media thus became their major source of informational and emotional support. However, workers were also exposed to fake news through interpersonal networks, which led to adverse effects, such as having a negative psychological impact. Dr Oktavianus remarked, “These networks provide crucial support, but also spread misinformation, creating both opportunities and challenges for empowering marginalised communities.” The research further highlighted the potential of community organisations in debunking hoaxes by disseminating credible news, thereby eliminating uncertainty, refuting misinformation and aiding in understanding the chaotic situation. In this regard, health campaigns are encouraged to utilise community-based storytellers, such as Indonesian organisations or ethnic media, to communicate public health information. Meanwhile, improving digital literacy is also important for helping foreign workers distinguish fake news from real. While the Philippines now has one of the highest breast cancer diagnosis rates in Asia, there is also an increasing number of Filipino workers diagnosed with breast cancer in Hong Kong. Dr Margo TURNBULL, Assistant Professor of the Department of English and Communication, led a research team focusing on the health literacy needs of migrant domestic workers. Published in the journal Quality Health Research, the research study provides a critical examination of how breast cancer and migration impact the lives of these workers. This study again emphasised the importance of health campaigns in workers’ native language and of their access to health facilities, particularly on Sundays, enabling them to receive timely diagnoses and assistance. Dr Turnbull added, “Improving language and communication skills can also increase workers’ effective utilisation of medical resources, alleviate the psychological impacts of having cancer and enhance their confidence in advocating for their healthcare needs.” Currently, Dr Turnbull is working with a cancer support group to co-develop multilingual communication resources that can be used by migrant domestic workers to share information about their diagnosis and care needs with their employers, families and doctors. In light of the structural issues uncovered by the studies, a symposium, “Migrant Worker Lives Matter”, organised by the Department of English and Communication in collaboration with two local migrant worker NGOs, PathFinders and Mission for Migrant Workers, will be held at the PolyU campus on 24 May. The event aims to address the challenges faced by migrant domestic workers and explore ways for Hong Kong to become a more inclusive society.   ***END***  

21 May, 2024

Research & Innovation Research and Innovation Office

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PolyU and Huizhou Daya Bay sign a cooperation agreement to establish joint technology and innovation research institute

Only Chinese version.

17 May, 2024

Events Research and Innovation Office

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PolyU-nurtured startup takes lead in implementing territory-wide large-scale liver disease screening programme ; As the first participating institution, PolyU drives translation of research into real-world applications

According to the “2024 Global Hepatitis Report” by the World Health Organization, the number of lives lost due to viral hepatitis is increasing year by year, leading to 1.3 million deaths in 2022, claiming 3,500 lives each day in average, and resulting in it constituting the second leading cause of infectious disease deaths worldwide 1. In response to this global public health issue, Eieling Technology Limited (Eieling Technology), an academic-led startup nurtured and supported by The Hong Kong Polytechnic University (PolyU), has announced its leadership in implementation of the five-year “LiverCare – Hong Kong 10 Million Liver Scans Program” (the Programme), to improve public awareness of liver disease prevention, and promote early detection and treatment to reduce the impact of liver disease. Prof. Christopher CHAO, Vice President (Research and Innovation) of PolyU and Prof. ZHENG Yongping, Henry G. Leong Professor in Biomedical Engineering, Chair Professor of Biomedical Engineering and Director of the Research Institute of Smart Ageing of PolyU, joined by Mr Patrick LAU, Deputy Executive Director of the Hong Kong Trade Development Council; Prof. Walter SETO, Clinical Professor in Gastroenterology and Hepatology of the University of Hong Kong; Dr Grace LAU, Head of the Institute for Translational Research of the Hong Kong Science and Technology Parks Corporation (HKSTP); Mr Xiaojia JIA, Chief Executive Officer of Eieling Technology Limited; and Ms Mildred LAW of the Hong Kong Liver Foundation officiated at the Programme launch ceremony yesterday (16 May). PolyU has long been committed to translating its technologies into real-world applications. The University will support the Programme and become the first institution to conduct the Programme. Starting from July this year, PolyU will conduct liver fibrosis and fatty liver screening for full-time university staff using Liverscan®, a palm-size wireless ultrasound imaging device. Participants are also encouraged to join a two-year follow-up study. From the data collected, the research team will study the importance of a balanced diet and daily exercise, as well as regular liver disease screening for monitoring the progression of liver disease. PolyU believes that the programme can not only improve public awareness of liver disease prevention and promote early detection and treatment, but also help reduce the threat of liver disease to human health. Prof. Chao said, “As a PolyU-nurtured start-up, Eieling Technology actively commercialises the University’s patents. With the support from investors and industries through the innovation and entrepreneurship ecosystem of PolyU, the company is able to translate its technologies into products with a positive impact on society. The launch of the programme marks a milestone for PolyU in contributing to the global public health, reflecting the University's commitment to social responsibility and the translation of scientific research outcomes. In recent years, PolyU has strategically established technology innovation institutes in several cities in the Mainland China, aiming to combine PolyU's unique advantages in basic research and innovation with the robust industrial bases and characteristics of various regions in the Mainland. This initiative promotes research and transformation of core technologies, cultivates innovative talents with knowledge in technology and global vision, and provides a more optimised application platform and scenarios for enterprises. Through these measures, PolyU will continuously strengthen its cooperation with cities in Mainland China, promote regional economic development, and also provide a favorable environment for university researchers to apply theory to practice and commercialise research findings." Eieling Technology, co-founded by Prof. Zheng and his research team in 2018, is a technology development company specialising in advanced medical ultrasound imaging devices designed to screen for liver diseases. Prof. Zheng and his PolyU research team combined transient elastography diagnostic technology with a real-time ultrasound image guided system to develop a solution called Liverscan® for liver fibrosis assessment. Liverscan® is an innovative medical device which, since it is palm-sized, wireless, lightweight and portable, easy to control and economical, allows medical staff to perform liver checkups on patients anytime, anywhere. Prof. Zheng said, “Liver fibrosis can be caused by long-term inflammation of liver tissue, excessive alcohol intake or long-term fatty liver, and may develop into cirrhosis, liver dysfunction, or even liver cancer. We hope that through the ultrasound device Liverscan®, which can lower costs, shorten examination time, facilitate operation and improve measurement accuracy, liver disease assessment and screening will be widely available to people in the community, thereby reducing the number patients with severe liver disease in the coming years significantly.” Eieling Technology has been supported by the PolyU Tech Launchpad Fund and the Incu-Bio Programme of HKSTP, as well as by secured funding from several industrial partners and private investors. Liverscan® has obtained registration approval from the US Food and Drug Administration (FDA510K) and is being used in many well-known hospitals and clinics in Hong Kong, Macau and other places. Eieling Technology is also carrying out clinical research and cooperation with several hospitals in Mainland China. Liverscan® is expected to enter the market in Mainland China after receiving registration approval from the National Medical Products Administration in Q3 this year, and to be launched globally in 2025.   1 World Health Organization- “Global hepatitis report 2024”     ***END***  

17 May, 2024

Research & Innovation Knowledge Transfer and Entrepreneurship Office

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PolyU study reveals effectiveness of GBGI infrastructure in mitigating urban heat, proposing nine-stage framework for development of a sustainable city

Primarily due to the impact of urbanisation and global warming, urban heatwaves have become a challenging issue worldwide, with Hong Kong persistently experiencing record-breaking high-temperature days. Mitigating urban heat through green and blue infrastructures is essential for creating a sustainable environment. Prof. Hai GUO, Professor of the Department of Civil and Environmental Engineering at The Hong Kong Polytechnic University (PolyU) and global researchers have conducted a first-of-its-kind study on the effectiveness of green interventions in cooling urban heat across various regions that can assist policymakers in prioritising effective interventions to develop sustainable cities. The study findings have been published in the international interdisciplinary journal The Innovation. Globally, the most efficient air cooling was observed in botanical gardens, wetlands, green walls, street trees and vegetated balconies. In light of this, the research team conducted a global review of the effectiveness of green-blue-grey infrastructure (GBGI) in air cooling. GBGI refers to green infrastructures that encompass naturally vegetation-based elements like trees, grass and hedges; blue infrastructures are related to water-based features like pools, lakes and rivers; and grey infrastructures comprise engineered structures including green walls, green facades and roofs. The Study revealed regional and city-specific variations in the effectiveness of GBGI for mitigating urban heat. In Europe, Asia, North America and Australia, the overall cooling effect of GBGI is up to 18.9°C, 17.7°C, 12°C and 9.63°C respectively. In addition, the implementation of green and blue infrastructures has proven to be highly effective in lowering air temperatures globally. While green infrastructures can regulate urban heat through evaporation, transpiration, shading and thermal insulation, blue infrastructures absorb heat and cool the surrounding area through evaporation. In Asian cities, constructed grey infrastructures, especially roof gardens and pergolas, are found to be the most effective for urban cooling. Roof gardens in Singapore achieved the most significant temperature reduction of 17.7°C. Pergolas and green roofs in Japan and South Korea also had substantial impact, resulting in cooling temperatures by 16.2°C and 10.8°C, respectively. Linearly planted hedges and street trees contributed to lowering temperatures by up to 10.8°C. Authorities are advised to plant more street trees, not only for their impressive cooling efficiency but also for their substantial potential to create other positive environmental impacts. The Study also showed notable effects of various GBGI features in mitigating urban heat in Mainland China cities. The most effective means include botanical gardens, wetlands, green walls and attenuation ponds which exhibited temperature reductions of up to 10°C, 9.27°C, 8°C and 7°C respectively. Although the cooling effect ranges are generally similar in the north and south of China, there is variability within the same region. For example, in Beijing, botanical garden could result in up to 10°C temperature decrease while that in Shaanxi province only contributed to 2.7°C. In Hong Kong, parks, green roofs and golf courses were found to play substantial roles in cooling urban heat, resulting in temperature reductions of 4.9°C, 4.9°C and 4.2°C respectively. A “Shining City Project” was proposed by the Hong Kong government in last year’s Policy Address to enhance urban green space. This initiative includes the greening of riverbanks to turn them into flower viewing points and the extensive planting of trees in government venues and at roundabouts on major roads. Prof. Guo said, “With their distinctive location and natural environment, the types of GBGI in Hong Kong are unique. The city features a network of oceans, rivers, wetlands and reservoirs, with remarkable vegetation cover, encompassing approximately 70% of its land area of which country parks occupy around 40%, and possesses a precious natural asset in the Victoria Harbour. Meanwhile, the Government actively promotes GBGI in new development areas and the adoption of green building design in new government projects. These forward-looking initiatives highlight Hong Kong’s dedication to sustainable and resilient urban development.” Globally, the types of GBGI vary significantly across continents due to diverse regional contexts, climate conditions and urban planning priorities. The Study’s GBGI heat mitigation inventory can assist policymakers and urban planners in prioritising effective interventions to reduce the risk of urban overheating and promote community resilience. At this point, the research team has introduced a nine-stage framework to facilitate the implementation of GBGI that outlines stages of stakeholder engagement, feasibility studies, design, policy development, implementation, monitoring, evaluation, and eventual upscaling and replication. Prof. Guo emphasised, “This framework serves as a strategic roadmap, optimising GBGI implementation to maximise benefits. Policymakers should conduct thorough investigation and planning tailored to the specific context and needs of their cities. In Asia, the extensive development of GBGI is a response to challenges posed by rapid urbanisation and cultural preferences that prioritise green areas for community activities, together with environmental goals focused on biodiversity conservation, improved air quality and mitigation of the urban heat island effect. It is crucial for future GBGI implementation to adopt a holistic approach, optimising their multifunctional benefits to effectively address sustainability goals.”   ***END***  

16 May, 2024

Research & Innovation Department of Civil and Environmental Engineering


PolyU Journal Nexus holds forum on sustainability and interdisciplinary research and innovation

The Hong Kong Polytechnic University (PolyU) and Cell Press co-hosted the Nexus Forum 2024 on campus on 9 to 10 May. Themed “Sustainable Exploration of Interdisciplinary Research and Innovation”, the forum explores innovative research in applied sciences, engineering, technology, and interdisciplinary fields that address the world’s major challenges. The two-day forum attracted over 150 participants, including an international line-up of keynote speakers from Canada, the United Kingdom, the United States, Germany, Japan and mainland China, as well as authors, session chairs, staff members and students. In the opening ceremony, PolyU’s Executive Vice President Dr Miranda LOU, Chair Professor of Building Thermal Science and Director of PolyU Academy for Interdisciplinary Research (PAIR) Prof Qingyan CHEN, Chair Professor of Energy and Buildings and Editor-in-Chief of Nexus Prof Jerry YAN, and Vice President of Editorial Strategy and Innovation at Cell Press and Editor-in-Chief of Immunity Dr Peter LEE warmly welcomed the audience from around the world. The keynote and panel speakers delved into four main topics, covering interdisciplinary solutions for sustainable futures, innovative materials-based solutions, carbon neutrality and energy system transformation and smart data-based science and technology, that sparked thought-provoking dialogues between the presenters and the audiences on how cross-discipline innovation and research can shape a sustainable future for all. Nexus is Cell Press’s first partner journal in the physical sciences and the first title published in collaboration with a university. Its addition marks Cell Press’s continued growth in open access physical sciences titles, which include Cell Reports Physical Science and Cell Reports Sustainability. To learn more about Nexus, please visit .   ***END***  

16 May, 2024

Events PolyU Academy for Interdisciplinary Research (PAIR)

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PolyU presents Lifetime Achievement Award to two distinguished scholars at inaugural Yuen Ren Chao Prize in Language Sciences

The Hong Kong Polytechnic University (PolyU) is privileged to announce that Prof. Peter HAGOORT, Director of the Max Planck Institute for Psycholinguistics, and Prof. William Shiyuan WANG, Chair Professor of Language and Cognitive Sciences of PolyU, are bestowed the Lifetime Achievement Award at the inaugural Yuen Ren Chao Prize in Language Sciences (Chao Prize). The Prize Presentation Ceremony was held on 10 May 2024. The Chao Prize, initiated and hosted by the PolyU Faculty of Humanities, is named after the late Professor Yuen Ren Chao who is widely regarded as the father of modern Chinese language studies. It is an international award that honours scholars and researchers who have made distinguished contributions to language sciences. Addressing the Ceremony, Dr LAM Tai-fai, PolyU Council Chairman, said, “The Faculty of Humanities strives to follow the same interdisciplinary approach of Prof. Chao, by bringing together language, communication, history, culture and technology to advance understanding and foster innovation. PolyU fully supports this award, as it aligns with our motto ‘To learn and to apply, for the benefit of mankind’, by promoting excellence in language sciences research and its practical applications for the betterment of society. More broadly, this Prize represents our commitment to deepening cultural understanding for the benefit of the wider community.” On behalf of the University, Prof. LI Ping, Dean of the PolyU Faculty of Humanities, expressed gratitude to the Chao family for giving PolyU permission to establish the Prize in Prof. Chao name, and also to the Patron of the Prize, Shenzhen iRead Foundation, for its generous donation to support the Prize. Through the Chao Prize, the Faculty is poised to bring together renowned scholars in the field of language sciences from around the world and become a hub in language sciences research.    While the iRead Foundation is dedicated to promoting children’s reading, Ms LI Wen, iRead Foundation Founder and Executive Board Chair, applauded the social value of the Chao Prize. She remarked, “Language serves as a vital tool for children to communicate, exchange ideas and acquire knowledge. By scientifically studying language, we can better understand how language development helps children’s mental and physical growth, as well as the patterns of language acquisition. This, in turn, enables us to provide children with better educational resources for reading and support them in cultivating good reading habits.” Both the Laureates are esteemed scholars of language sciences. Their research findings have brought major breakthroughs and far-reaching impacts to the field. Prof. Peter Hagoort receives the Yuen Ren Chao Prize in Language Sciences (Lifetime Achievement Award) for his distinguished contributions to the interdisciplinary studies in cognitive neuroscience and the understanding of human language processing in the brain. He applied neuroimaging techniques to investigate the language system and its impairments as in aphasia, dyslexia and autism. He is the Founding Director of the Donders Institute, Centre for Cognitive Neuroimaging and Professor in Cognitive Neuroscience at Radboud University Nijmegen, The Netherlands. He is also an elected member of the Royal Netherlands Academy of Arts and Sciences, the Academia Europaea, and the US National Academy of Sciences. Prof. Peter Hagoort is awarded the inaugural Chao Prize. In his acceptance speech, Prof. Hagoort said that it is all more rewarding to receive a prize named after an intellectual giant like Prof. Chao, who reminds us that language is not only an object of study, but also the way to create literature and humour, and thereby adding to the joy of life. Prof. William Shiyuan Wang receives the Yuen Ren Chao Prize in Language Sciences (Lifetime Achievement Award) for his distinguished contributions to the interdisciplinary studies in Chinese linguistics, evolutionary linguistics, and the cognitive neuroscience of language and ageing. His early interest in evolutionary theory, both biological and cultural, provided the basis of a theory of lexical diffusion. He was elected Inaugural President of the International Association of Chinese Linguistics when it was formed in Singapore. Other prestigious honours Prof. Wang has received include award from the Guggenheim Foundation, Honorary Degree of Doctor of Humane Letters from University of Chicago as well as Fellowship from the Linguistic Society of America.  He is now also Professor Emeritus of the University of California, Berkeley and an elected Academician of Academia Sinica.  Prof. William Shiyuan Wang is awarded the inaugural Chao Prize. In his acceptance speech, Prof. Wang said that the Prize is based on the recognition of the vital and central role language plays in all human affairs, and that with Hong Kong sitting at the corssroads between East and West, PolyU is well situated for scholars to continually interact and collaborate with each other even across continents. For the biography of the two Laureates, please visit the website of the Yuen Ren Chao Prize in Language Sciences.   ***END***  

13 May, 2024

Events Faculty of Humanities

Con-Day-2024_Press Room

“PolyU JUPAS Consultation Day 2024” coming soon, offering latest information on programmes and mock admission interviews for the first time

The Hong Kong Polytechnic University (PolyU) is holding the “PolyU JUPAS Consultation Day 2024” on 18 May 2024 (Saturday) from 10am to 1pm. Joint University Programmes Admissions System (JUPAS) applicants will be able to obtain the latest updates on PolyU programmes during the event, enabling them to re-evaluate and finalise their programme choices by late-July. Registration for the Consultation Day is now open at This year, PolyU will, for the first time, introduce mock admission interviews. Professors from different faculties will conduct individual or group mock interviews with participants and provide them with valuable post-interview feedback. About 70 mock interview sessions will be conducted, covering all programmes that will arrange interviews for JUPAS applicants. Places are available on a first-come, first-served basis. Among other engaging activities on the Consultation Day, the Academic Registry will host a thematic seminar on “admissions strategies and interview skills” to introduce the latest admissions arrangements, while PolyU student ambassadors from each faculty and school will share their interview experiences and useful tips for programme selection. Academic units will organise programme information seminars, consultation counters and guided tours to campus facilities, while an AI-powered information kiosk will be in place on campus to deliver admission information, allowing participants to learn about the entrance requirements, score calculation, curricula and features of their preferred disciplines/programmes. At the same time, participants will also have a chance to experience PolyU’s vibrant learning atmosphere. In the 2024/25 academic year, PolyU will further enhance some of its departmental scheme-based admissions programmes to address societal needs. Two new programmes, namely BSc (Hons) Scheme in Food Safety and Technology and BSc (Hons) in Urban Informatics and Smart Cities, will also be launched. Meanwhile, the University will continue to adopt flexible arrangements with regard to the minimum entrance requirements for JUPAS applicants. Applicants who fall slightly short of the general entrance requirements for degree programmes, i.e. “3-3-2-A-3-3” (level 3 in both languages, level 2 in Mathematics, “Attained” in Citizenship and Social Development, together with level 3 in two additional electives) will be given special consideration for admission under specific conditions. More details will be announced later on the Study@PolyU website ( For enquiries about the “PolyU JUPAS Consultation Day 2024”, please email For information about JUPAS admissions at PolyU, please reach out to the Academic Registry’s AI-powered virtual assistants.   ***END***  

10 May, 2024

Events Academic Registry


iRead Foundation makes donation to PolyU to support Yuen Ren Chao Prize in Language Sciences and to advance scientific research in the field

The Hong Kong Polytechnic University (PolyU) has received generous funding from the Shenzhen iRead Foundation (iRead Foundation) to support the Yuen Ren Chao Prize in Language Sciences (the Chao Prize) and to advance the development of language sciences.  Following the donation, PolyU and iRead Foundation will also explore opportunities to foster their academic and public engagement collaborations. Launched by the PolyU Faculty of Humanities last year, the Chao Prize comprises two awards, namely the Lifetime Achievement Award and Early Career Contribution Award. The awards are presented biennially, starting from 2024, to senior and junior scholars who have made distinguished contributions to research and education in language sciences. iRead Foundation is committed to enhancing the development of the reading ability and quality in children. Recognising the aspiration of and the social value brought about by the Chao Prize, the Foundation has made a donation of US$800,000 to fund the cash prizes given to the Prize recipients for five consecutive prize cycles starting from the inaugural one in 2024. With this generous support, the Lifetime Achievement Award recipients will be awarded US$100,000, while the Early Career Contribution Award recipients will be awarded US$50,000. Ms LI Wen, iRead Foundation Founder and Executive Board Chair, hopes to advance scientific research on children’s reading and language development through the donation. She said, “Language is a significant tool for children to communicate and acquire knowledge. We believe the development of language sciences is crucial to the enhancement of children’s reading and writing. Through language research, we are able to gain a deeper understanding of how language development impacts children’s mental and physical growth, as well as their learning patterns. With this understanding, we can develop better reading resources for children and help them develop positive lifelong reading habit.” Prof. LI Ping, Dean of the PolyU Faculty of Humanities, sincerely thanked iRead Foundation for their generous donation which enables the University to increase the amounts awarded while also adding visibility to the Prize. He said, “PolyU truly appreciates the efforts of the Foundation to promote children’s reading and language abilities. We look forward to collaborating with them in fostering research and exchanges in the fields of language studies and reading development.” Through the Chao Prize, the Faculty is poised to bring together renowned scholars in the field of language sciences around the world, making itself a hub of language sciences research. The awardees of the inaugural Yuen Ren Chao Prize in Language Sciences have been announced and the Prize Presentation Ceremony, hosted by the PolyU Faculty of Humanities, will be held this month. For more information, please visit   ***END***

6 May, 2024

Events Faculty of Humanities

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PolyU researchers create 2D all-organic perovskites and demonstrate potential use in 2D electronics

Perovskites are among the most researched topics in materials science. Recently, a research team led by Prof. LOH Kian Ping, Chair Professor of Materials Physics and Chemistry and Global STEM Professor of the Department of Applied Physics of The Hong Kong Polytechnic University (PolyU), Dr Kathy LENG, Assistant Professor of the same department, together with Dr Hwa Seob CHOI, Postdoctoral Research Fellow and the first author of the research paper, has solved an age-old challenge to synthesise all-organic two-dimensional perovskites, extending the field into the exciting realm of 2D materials. This breakthrough opens up a new field of 2D all-organic perovskites, which holds promise for both fundamental science and potential applications. This research titled “Molecularly thin, two-dimensional all-organic perovskites” was recently published in the prestigious journal Science. Perovskites are named after their structural resemblance to the mineral calcium titanate perovskite, and are well known for their fascinating properties that can be applied in wide-ranging fields such as solar cells, lighting and catalysis. With a fundamental chemical formula of ABX3, perovskites possess the ability to be finely tuned by adjusting the A and B cations as well as the X anion, paving the way for the development of high-performance materials. While perovskite was first discovered as an inorganic compound, Prof. Loh’s team has focused their attention on the emerging class of all-organic perovskites. In this new family, A, B, and X constituents are organic molecules rather than individual atoms like metals or oxygen. The design principles for creating three-dimensional (3D) perovskites using organic components have only recently been established. Significantly, all-organic perovskites offer distinct advantages over their all-inorganic counterparts, as they are solution-processible and flexible, enabling cost-effective fabrication. Moreover, by manipulating the chemical composition of the crystal, valuable electromagnetic properties such as dielectric properties, which finds applications in electronics and capacitors, can be precisely engineered. Traditionally, researchers face challenges in the synthesis of all-organic 3D perovskites due to the restricted selection of organic molecules that can fit with the crystal structure. Recognising this limitation, Prof. Loh and his team proposed an innovative approach: synthesising all-organic perovskites in the form of 2D layers instead of 3D crystals. This strategy aimed to overcome the constraints imposed by bulky molecules and facilitate the incorporation of a broader range of organic ions. The anticipated outcome was the emergence of novel and extraordinary properties in these materials. Validating their prediction, the team developed a new general class of layered organic perovskites. Following the convention for naming perovskites, they called it the “Choi-Loh-v phase” (CL-v) after Dr Choi and Prof. Loh. These perovskites comprise molecularly thin layers held together by forces that hold graphite layers together, the so-called van der Waals forces – hence the “v” in CL-v. Compared with the previously studied hybrid 2D perovskites, the CL-v phase is stabilised by the addition of another B cation into the unit cell and has the general formula A2B2X4. Using solution-phase chemistry, the research team prepared a CL-v material known as CMD-N-P2, in which the A, B and X sites are occupied by CMD (a chlorinated cyclic organic molecule), ammonium and PF6− ions, respectively. The expected crystal structure was confirmed by high-resolution electron microscopy carried out at cryogenic temperature. These molecularly thin 2D organic perovskites are fundamentally different from traditional 3D minerals, they are single crystalline in two dimensions and can be exfoliated as hexagonal flakes just a few nanometres thick – 20,000 times thinner than a human hair. The solution-processibility of 2D organic perovskites presents exciting opportunities for their application in 2D electronics. The Poly U team conducted measurements on the dielectric constants of the CL-v phase, yielding values ranging from 4.8 to 5.5. These values surpass those of commonly used materials such as silicon dioxide and hexagonal boron nitride. This discovery establishes a promising avenue for incorporating CL-v phase as a dielectric layer in 2D electronic devices, as these devices often necessitate 2D dielectric layers with high dielectric constants, which are typically scarce. Team member Dr Leng successfully addressed the challenge of integrating 2D organic perovskites with 2D electronics. In their approach, the CL-v phase was employed as the top gate dielectric layer, while the channel material consisted of atomically thin Molybdenum Sulfide. By utilising the CL-v phase, the transistor achieved superior control over the current flow between the source and drain terminals, surpassing the capabilities of conventional silicon oxide dielectric layers. Prof. Loh’s research not only establishes an entirely new class of all-organic perovskites but also demonstrates how they can be solution-processed in conjunction with advanced fabrication technique to enhance the performance of 2D electronic devices. These developments open up new possibilities for the creation of more efficient and versatile electronic systems.   ***END***  

6 May, 2024

Research & Innovation Department of Applied Physics


PolyU collaborates with Shanghai Westwell Technology to establish joint innovation laboratory

The Shanghai Municipal People’s Government held the “Invest in Shanghai • Share the Future” promotion campaign in Hong Kong on 26 April. Witnessed by Mr GONG Zheng, Mayor of Shanghai and Mr John LEE Ka-chiu, Chief Executive of the Hong Kong Special Administrative Region, The Hong Kong Polytechnic University (PolyU) and Shanghai Westwell Technology Co. Ltd (Shanghai Westwell Technology) signed an agreement for research collaboration in artificial intelligence and autonomous vehicle technology. The two parties will together build a joint innovation laboratory to explore the frontiers and application practices in these fields. At the event, 18 enterprises and institutions from Hong Kong and Shanghai signed eight key cooperation agreements, involving cooperation in fields such as financial services, energy investment, and industry-academia-research collaboration, including the establishment of the PolyU and Shanghai Westwell Technology joint innovation laboratory. Leveraging the joint laboratory platform, the collaboration between the two parties will promote the sharing and integration of resources. It will also foster technological breakthroughs and industrial applications in areas of common focus such as advanced navigation and positioning systems, spatial perception technologies, new auxiliary technologies and unmanned driving control technologies. The partnership will also deepen research cooperation between industry and academia, fostering the cultivation of high-quality scientific research and engineering talents. Prof. Christopher CHAO, Vice President (Research and Innovation) of PolyU, said “Deep integration of industry, academia and research has become key to technological innovation and development. Therefore, the collaboration between PolyU and Shanghai Westwell Technology carries great significance. The two parties will fully leverage their respective advantages at the forefront of artificial intelligence and move forward in collaborative innovation, talent cultivation and other areas, providing new impetus for the development of artificial intelligence technologies.” Mr TAN Limin, Founder and Chairman of Shanghai Westwell Technology, said, “As a technology company deeply engaged in the application of artificial intelligence, Shanghai Westwell Technology is honoured to collaborate with The Hong Kong Polytechnic University. We look forward to climbing the peaks of sci-tech innovation together with PolyU and applying artificial intelligence technologies to enhance human well-being and build a better world.” Looking ahead, PolyU will join hands with Shanghai Westwell Technology to build an innovative alliance with deep integration of industry, academia and research. They will promote close cooperation and exchanges in artificial intelligence and autonomous driving to propel research breakthroughs and knowledge transfer, accelerating the development of new quality productive forces. ***END***  

29 Apr, 2024

Events Research and Innovation Office

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