文献类型：期刊文献

英文题名：Synthesis of Monodisperse Nanocrystals via Microreaction: Open-to-Air Synthesis with Oleylamine as a Coligand

作者：Yang, Hongwei[1];Fan, Ningning[1];Luan, Weiling[1];Tu, Shan-tung[1]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2009

卷号：4

期号：4

起止页码：344

外文期刊名：NANOSCALE RESEARCH LETTERS

收录：;EI(收录号：20090811912155);WOS:【SCI-EXPANDED(收录号:WOS:000263116500010)】；

基金：Authors appreciated the financial supports from the National Natural Science Fund of China (50772036) and the State Key Laboratory of Chemical Engineering at East China University of Science and Technology.

语种：英文

外文关键词：Quantum dots; Microreaction; Reaction kinetics; Size control

摘要：Microreaction provides a controllable tool to synthesize CdSe nanocrystals (NCs) in an accelerated fashion. However, the surface traps created during the fast growth usually result in low photoluminescence (PL) efficiency for the formed products. Herein, the reproducible synthesis of highly luminescent CdSe NCs directly in open air was reported, with a microreactor as the controllable reaction tool. Spectra investigation elucidated that applying OLA both in Se and Cd stock solutions could advantageously promote the diffusion between the two precursors, resulting in narrow full-width-at-half maximum (FWHM) of PL (26 nm). Meanwhile, the addition of OLA in the source solution was demonstrated helpful to improve the reactivity of Cd monomer. In this case, the focus of size distribution was accomplished during the early reaction stage. Furthermore, if the volume percentage (vol.%) of OLA in the precursors exceeded a threshold of 37.5%, the resulted CdSe NCs demonstrated long-term fixing of size distribution up to 300 s. The observed phenomena facilitated the preparation of a size series of monodisperse CdSe NCs merely by the variation of residence time. With the volume percentage of OLA as 37.5% in the source solution, a 78 nm tuning of PL spectra (from 507 to 585) was obtained through the variation of residence time from 2 s to 160 s, while maintaining narrow FMWH of PL (26-31 nm) and high QY of PL (35-55%).