Presenter: Dr. Wei Sun (University of Toronto)
Topic: Synthesisand Surface Reactions of Hydride Terminated Silicon Nanocrystals with StrongQuantum Size Effect
Time: 2:00 p.m.,Oct. 17th (Monday)
Location: Conference Room B, BLDG909-1F
Abstract
Silicon nanocrystals (ncSi) are drawing increasing attention because oftheir earth-abundance, low cost, and purported lack of toxicity. To synthesizefreestanding ncSi, we employed several methods that could all yieldhydride-terminated ncSi. A high yield synthesis was developed that producedpolydispersions of decyl-capped, hexane-soluble ncSi predominantly with NIRphotoluminescence. Using size-selective precipitation, these polydispersionswere separated into monodisperse fractions, which allowed theirphotoluminescence absolute quantum yield to be studied as a function of ncSisize. Finally, we describe theunprecedented observation that ncSi:H can function as a single componentheterogeneous reducing agent for converting gaseous CO2 selectivelyto CO. This work presented provides opportunities for applications ofsize-selected near infrared emitting ncSi in biomedical imaging, photothermaltherapy, and CO2 reduction for the production of chemicals andfuels.
Biography
Dr. Wei Sun received his B.S. degreein chemistry from Jilin University in 2010, and worked as student researcher atthe State Key Lab of Supramolecular Structure and Materials under thesupervision of Prof. Bai Yang. Recently obtained his doctoral degree from the chemistrydepartment at University of Toronto working with Prof. Geoffrey Ozin. Hisresearch interest is in functional nanomaterials, specifically related tosilicon and germanium nanostructures. Hehas published more than 10 scientific articles, including in Nature Communications, Adv. Mater., JACS andAdv. Funct. Mater. He has received a number of awards including Chinese GovernmentAward for Outstanding Self-Financed Students Abroad and Connaught Scholarship.
Contact:Prof. Le He
（责任编辑：张伶 邮箱：zhangling10@suda.edu.cn）