2023年4月27日美國肯塔基大學化工材料系楊福前教授來系參訪並演講

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上層分類：系所公告

分類：演講

建立於 2023-04-10, 週一 09:58

最近更新於 2023-05-05, 週五 15:14

發佈於：2023-04-10, 週一 10:04

點擊數：1643

演講公告

演講人：	楊福前教授
服務單位：	美國肯塔基大學化工材料系
演講題目：	綠色合成鹵化物鈣鈦礦奈米晶
演講時間：	112.04.27下午2點20分~4點00分
演講地點：	工綜館228

演講摘要：

Green Synthesis of Halide Perovskite Nanocrystals (CsPbBr₃ and CH₃NH₃PbBr₃)

Fuqian Yang

Department of Chemical and Materials Engineering

University of Kentucky, USA

Perovskite nanocrystals are regarded as next-generation functional materials for optoelectronic applications. To date, most synthesis methods have involved the use of organic solvents, such as N, N-dimethylformamide and dimethyl sulfoxide, which poses a potential threat to the environment, health and security. In this talk, I report our recent work on the feasibility to produce microsized APbBr₃ (A: Cs⁺ or CH₃NH₃⁺) crystals with deionized water as the precursor solvent via an environmental-friendly and cost-efficient approach and APbBr₃ nanocrystals from the microsized APbBr₃ crystals through a followed ultrasonication process. The blue-emitting CsPbBr₃ nanocrystals exhibit a photoluminescence (PL) quantum yield of 80%, much larger than 61.4% of the CsPbBr₃ nanocrystals made by an anti-solvent method; the green-emitting CsPbBr₃ nanocrystals exhibit better stability than those made by the antisolvent method over 9 days. The CH₃NH₃PbBr₃ nanocrystals derived from the CH₃NH₃PbBr₃ powder exhibit a high photoluminescence quantum yield (PLQY) of 93.86%. Poly(methyl methacrylate) (PMMA)- CH₃NH₃PbBr₃PbBr₃ NC films made from the CH₃NH₃PbBr₃PbBr₃ PeNCs retain ~97% and ~91% of initial PL intensity after 720 h aging in ambient environment at 50 °C and 70 °C, respectively.

個人學經歷：

Dr. Fuqian Yang is a professor in the Department of Chemical and Materials Engineering at the University of Kentucky. Dr. Yang hasestablished a vigorous research program in the University of Kentucky in green synthesis of semiconductor nanocrystals, synthesis of ultrafine metallic materials, diffusion-induced stress, multiscale micromechanical testing and characterization, including nanoindentation, atomic force microscopy, microindentation, and dynamic mechanical behavior. He has proposed the concept of grain boundary fluid in analyzing the creep behavior of crystalline metals, developed the techniques of electrical impression test, electric indentation, and evaporation-induced surface structures on polymer films, and developed green routes for the synthesis of semiconductor nanocrystals. He has published more than 420 archival refereed journal papers. Dr. Yang is an associated editor for Journal of Manufacture Processes and a member of editorial board for Materials Science and Engineering A. He and Professor J.C.M. Li of the University of Rochester co-edited a book “Micro and Nano Mechanical Testing of Materials and Devices”, which was published by Springer in 2008.