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Materials Frontier No.166
Title: Colloidal Metal Nanocrystals for Nanoplasmonics
Speaker: Prof. Jianfang Wang, Department of Physics The Chinese University of Hong Kong, Hong Kong, P. R. China
Venue: Room 308, Material Building A
Invitor: Tao Deng
Prof. Jianfang Wang earned his Ph.D. from Havard University in 2002. Prior to joining the Chinese University of Hong Kong in 2005, he was a postdoctoral fellow at the University of California, Santa Barbara. He is the recipient of a CUHK Research Excellence Award in 2008, and CUHK Young Researcher Award in 2012. He served/s on Editorial Advisory Boards of Advanced Optical Materials, Scientific Reports and Nanoscale Horizons. Also he’s an Associate Editor of high-impact journal, Nanoscale. Prof. Jianfang Wang is a productive scientist with h-index 52. His current research focuses on Plasmonics, nanophotonics, metal and metal oxide nanomaterials, and photocatalysis.
In this presentation, I will describe the synthesis of colloidal gold nanocrystals and discuss their plasmonic properties and applications. Their syntheses are all based on seed-mediated growth. Fine size tailoring is realized through mild oxidation and anisotropic overgrowth, which allows for precise control of the plasmon resonance energies. Their sizes and therefore their localized plasmon energies can be readily varied over broad spectral ranges by carefully controlling the synthetic conditions. I will then present the attractive plasmonic features of these noble metal nanocrystals, including their tunable plasmon wavelengths over a wide spectral range, extremely large absorption/scattering cross-sections, and large enhancements of local electric fields and densities of photonic states. Finally I will describe plasmonic applications out of our metal nanocrystals. Examples will include active plasmon switching, plasmonic catalysis, plasmonic sensing, time-temperature indicators and local photothermal heating.