AP Seminar - Physics and Chemistry at Ferroelectric Surfaces
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Date
20 Nov 2023
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Organiser
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Time
16:00 - 17:00
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Venue
CD620, 6/F, Wing CD, PolyU Map
Speaker
Prof. Jinxing Zhang
Summary
Ferroelectrics hold spontaneous polarization that can be switched by electric field. It may generate a switchable electric field across the solid–liquid interface, which provides a platform to control chemical reactions (physical properties) using physical fields (chemical stimuli). However, it is challenging to in-situ control such polarization-induced interfacial chemical structure and electric field. In this talk, I will introduce how to selectively construct chemical bonds at the surface of ferroelectric BiFeO3 in aqueous solution, leading to a reversible bulk polarization switching, without the application of electric field. We discover that the reversible polarization switching is ascribed to the sufficient formation of polarization-selective chemical bonds at its surface, which decreases the interfacial chemical energy. This water-induced ferroelectric switching allows us to construct large-scale type-printing of polarization [1] using green energy and opens up new opportunities for sensing [2], high-efficient catalysis [3], and Bio-tissue proliferation [4], etc.
References:
[1] Nature Communications 9, 3809, (2018). (Editor‘s highlights).
[2] Adv. Funct. Mater., 32, 2111180 (2022).
[3] Type-printable ferroelectric superdomain for enhanced mid-infrared photodetector, submitted.
[4] Adv. Funct. Mater. 27, 1703771 (2017).
Keynote Speaker
Prof. Jinxing Zhang
Professor
Department of Physics
Beijing Normal University
Professor Jinxing Zhang currently professor of Department of Physics, Beijing Normal University. He graduated from the Hong Kong Polytechnic University in 2009, and worked as a post-doctoral scholar at the University of California, Berkeley between 2009 and 2012. Jinxing has joined department of physics at Beijing Normal University as a full professor since the spring of 2012. The ultimate goal in Jinxing’s group is the artificial control of symmetries (time-reversal, space-inversion, gauge ones) in strongly correlated oxides for emergent quantum phenomena and functionalities, e.g. magnetoelectric phase transition, water-printing of ferroelectric polarization, topological spin textures and efficient spin-wave propagation. Recently, he has taken great efforts on exploring the potential applications of those fundamental discoveries on Beyond-CMOS devices. He published over 100 peer-reviewed papers including Nature Nanotechnology, Physical Review Letters, Advanced Materials, etc. In 2022, he was supported by Chinese National Science Fund for Distinguished Young Scholars.
