Presenter: Prof.Hongjie Dai, Stanford University
Topic: Carbon Based Nanosciences
Time: 9:00 AM, June 30th (Friday)
Location: 909-B
Abstract:
This talk will review our work on nanosciences based on carbon. I will first briefly review our earlier work of carbon nanomaterials including carbon nanotubes and graphene nanoribbons, and then focus on fluorescence imaging in the previously unexplored 1000-1700 nm NIR-II window to benefit from greatly suppressed photon scattering at long wavelengths.We show that NIR-II imaging is novel with up to ~ 4 mm tissue depth capable of sub-10 micron spatial resolution, using a wide range of fluorescent agents including carbon nanotubes, AgS2 quantum dots, donor-acceptor conjugated polymers and small organic molecules emitting in the 1000-1700 nm range. The second part of the talk will focus on our work on advancing new types of electrocatalysts for renewable catalyst applications and the development of novel batteries. I will talk about achieving record setting performance of electrocatalysts for water splitting including HER and OER. We have developed a novel Ni/NiO heterostructured hydrogen evolution reaction (HER) catalyst and a NiFe layered double hydroxide (NiFe LDH) oxygen evolution reaction (OER) catalyst to enable water splitting using a record low voltage of < 1.5 volt, making it possible to make an electrolyzer for hydrogen and oxygen gas generation running on a single AAA alkaline battery cell. I will also present our recent work on the development of rechargeable Al ion battery utilizing some of the most abundant materials on earth.
Biography
Prof. Hongjie Dai has made fundamental contributions to nanosciences especially to novel carbon-based nanomaterials. Dai developed widely adopted chemical vapor deposition for carbon nanotubes; invented the first electrical nanosensors using nanotube transistors; pushed nanotube transistors to the ballistic limit; pioneered nano-carbon biological applications for novel imaging and therapy; and invented new electrocatalysts and the aluminum-ion battery. He received a BS degree in Physics from Tsinghua University in 1989, a MS degree in Applied Sciences from Columbia University in 1991, and a PhD in Applied Physics/Physical Chemistry from Harvard University in 1994. Dai is the J. G. Jackson and C. J. Wood Professor of Chemistry at Stanford University. He is a Member of the National Academy of Sciences and Fellow of the American Academy of Arts and Sciences. Among other awards, Dai has received the APS James McGroddy Prize for New Materials, the ACS Pure Chemistry Award and the MRS Mid-Career Researcher Award.
Contact: Prof. Zhuang Liu