Seminar - Tailoring Nanostructures for Energy Conversion Devices by Prof. Jia Zhu
Date: 08 January 2016 (Friday)
Time: 11:00 am – 12:00 pm
Venue: EF305, The Hong Kong Polytechnic University
Supplying the world with sustainable energy is one of the most pressing issues in modern society. Nanomaterials with carefully tailored properties (such as interface, impurities) can be used to manipulate the flow of phonons, electrons and photons, to enable novel energy devices in an unconventional manner. In this talk, I will present two examples of nanostructure-enabled energy devices. We report a plasmonic enhanced solar desalination devices. The plasmonic absorber is fabricated through self-assembly of metallic nanoparticles onto a nanoporous template by one step deposition process. Because of its efficient light absorption and strong field enhancement, it can enable very efficient (>90%) and effective (4 orders salinity decrement) solar desalination. While silicon is considered as one of the most important materials for many energy applications, such as photovoltaics, Li-ion battery and thermoelectrics, most of silicon processes are historically developed for electronics not for energy applications. However, energy applications have very different requirements for materials (such as size, purity and cost). Here I will demonstrate that high quality and highly purified Si nanomaterials (99.999%) with fine control of size and geometry can be achieved through a self-purification process from low grade sources.
Dr. Jia Zhu is a Professor at College of Engineering and Applied Sciences, Nanjing University. His scientific research interest is in the area of nanomaterials, nanophotonics and nanoscale heat transfer. Dr. Zhu obtained his bachelor in Physics at Nanjing University, received his M.S. and Ph.D. in Electrical Engineering from Stanford University. He worked as a postdoctoral fellow at University of California, Berkeley and Lawrence Berkeley National Lab. In Sept. 2013 he returned back to Nanjing University, to be a Professor at College of Engineering and Applied Sciences. He has received several prestigious awards including: Youth “973” (2015), Youth One-thousand Program (2014), Division of Inorganic Chemistry Yong Investigator Award (American Chemical Society, 2011), Gold Medal of Graduate Student Award (Material Research Society, 2010), Chinese Government Award for Outstanding Students Abroad (2009).