Plasmon-Mediated Surface Chemistry
主講人：W. David Wei教授
W. David Wei currently is an Associate Professor in the Department of Chemistry of the University of Florida working in analytical, physical, and materials chemistry with research interests in novel electronic and optical properties of metallic and semiconductor nanomaterials and their applications in solar energy harvesting, conversion and storage; visible-light photocatalysis; and chemical and biological detection. David received his Ph.D. from the University of Texas at Austin with Mike White and trained as a postdoctoral researcher at Northwestern University with Chad Mirkin. He has also held a visiting research position at Pacific Northwest National Labs (PNNL). David has more than 60 publications including Chemical Reviews, Nature Materials, Nature Chemistry, JACS, Angewandte Chemie International Edition, Advanced Materials, Advanced Energy Materials, and Chemical Science, 120 invited talks, and 9 pending patents, and he is a member of the American Chemical Society, Materials Research Society, Electrochemical Society, and American Vacuum Society. He has been awarded a summer fellowship at PNNL, the ORAU Ralph E. Powe Junior Faculty Enhancement Award, the Sigma Xi Junior Faculty Research Award, the UF-HHMI Science for Life Distinguished Mentor Award, the UF faculty Adviser/Mentor of the Year Award, the NSF CAREER award, the UF Term Professorship, and UF Research Foundation Professorship.
Using sunlight to facilitate and promote valuable chemical reactions is an ideal solution to the challenge of meeting future energy demands. Plasmonic nanostructures boast broadly tunable optical properties coupled with catalytically active surfaces that offer a unique opportunity for solar photochemistry. Resonant optical excitation of surface plasmons produces energetic hot charge carriers that can be collected to facilitate chemical reactions. This talk will show that we unambiguously reveal the mechanics of plasmon-mediated electron transfer (PMET) in Au/TiO2 heterostructures under visible light (λ > 515 nm) during in situ operation and further discuss how we directly probe the relaxation dynamics and energetics of the transferred “effective hot electrons” that participate in photocatalytic reactions. Strategies will be developed for the rational design and construction of a new class of multi-component solar photocatalysts. Finally, I will touch on our recent effort to use SPR-mediated photothermal effects to synthesize hybrid bimetallic nanomaterials and then use these nanomaterials to oxidize CO in the presence of visible light.