文献类型：期刊文献

英文题名：Open-to-air synthesis of monodisperse CdSe nanocrystals via microfluidic reaction and its kinetics

作者：Luan, Weiling[1]; Yang, Hongwei[1]; Tu, Shan-Tung[1]; Wang, Zhiming[2]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Univ Arkansas, Mat Res Sci & Engn Ctr, Fayetteville, AR 72701 USA

年份：2007

卷号：18

期号：17

外文期刊名：NANOTECHNOLOGY

收录：;EI(收录号：20071510548289);WOS:【SCI-EXPANDED(收录号:WOS:000246553700011)】；

语种：英文

外文关键词：Absorption spectra - Cadmium compounds - Capillary tubes - Full width at half maximum - High temperature effects - Microfluidics - Photoluminescence - Polytetrafluoroethylenes - Reaction kinetics - Size distribution

摘要：Monodisperse zinc blende CdSe nanocrystals (NCs) ranged from 2.5 to 4.3 nm have been reproducibly synthesized directly open to air in a microfluidic reactor with PTFE capillaries acting as the reaction channels. The foregoing features led to superior operational stability, allowing the assessment of kinetic data such as temperature, dwelling time and ligand concentration. Red shifts of the absorption spectra were observed with increasing residence time and temperature. 'Crossover time' of size distribution was first reported in a microfluidic reactor preceded by encouraged Ostwald ripening at high reaction temperature. Oleic acid concentration influenced the formation of CdSe NCs, and high OA to Cd ratio resulted in large NCs size and decreased CdSe concentration. By systematic optimization of the parameters, CdSe NCs with FWHM for the photoluminescence peak in the range from 35 to 42 nm were thus made possible.