Title: Phase Engineering of Nanomaterials
Speaker: Prof. Hua Zhang, City University of Hong Kong
Time：10:00, January 22nd (Wednesday)
Venue: Third floor conference room, South Building
In this talk, I will summarize the recent researches on the phase engineering of nanomaterials (PEN) in my group. In particular, we focus on the rational design and synthesis of novel nanomaterials with unconventional phases for various promising applications. For example, by using wet-chemical methods, for the first time, we have successfully synthesized the hexagonal-close packed (hcp) Au nanosheets, 4H hexagonal Au nanoribbons, crystal-phase heterostructured 4H/fcc and fcc/2H/fcc Au nanorods, the epitaxial growth of metal nanostructures with unconventional crystal phases on the aforementioned Au nanostructures, and amorphous/crystalline hetero-phase Pd nanosheets. In addition, by using gas-solid reactions, metastable 1T'-phase group VI transition metal dichalcogenides (TMDs), including WS2, WSe2, MoS2, MoSe2, WS2xSe2(1-x) and MoS2xSe2(1-x) have been prepared. Moreover, the phase transformation of TMDs during our developed electrochemical Li-intercalation method has also be observed. Impressively, the lithiation-induced amorphization of Pd3P2S8 has been achieved. Currently, my group focuses on the (crystal) phase-dependent physicochemical properties and applications in catalysis, surface enhanced Raman scattering, waveguide, photothermal therapy, chemical and biosensing, clean energy, etc., which we believe are quite unique and very important not only in fundamental studies, but also in practical applications. Importantly, the concepts of phase engineering of nanomaterials (PEN), crystal-phase heterostructures, and hetero-phase nanomaterials are proposed.
Biography of Prof. Hua Zhang:
Dr. Hua Zhang obtained his B.S. and M.S. degrees at Nanjing University in China in 1992 and 1995, respectively, and completed his Ph.D. with Prof. Zhongfan Liu at Peking University in China in July 1998. He joined Prof. Frans C. De Schryver’s group at Katholieke Universiteit Leuven (KULeuven) in Belgium as a Research Associate in January 1999. Then he moved to Prof. Chad A. Mirkin’s group at Northwestern University as a Postdoctoral Fellow in July 2001. He started to work at NanoInk Inc. (USA) as a Research Scientist/Chemist in August 2003. After that, he worked as a Senior Research Scientist at Institute of Bioengineering and Nanotechnology in Singapore from November 2005 to July 2006. Then he joined the School of Materials Science and Engineering in Nanyang Technological University (NTU) as an Assistant Professor. He was promoted to a tenured Associate Professor on March 1, 2011, and Full Professor on Sept. 1, 2013. In 2019, he joined the Department of Chemistry in City University of Hong Kong as a Chair Professor (Herman Hu Chair Professor of Nanomaterials).