文献类型：期刊文献

英文题名：Continuous synthesis of CdSexTe1-x nanocrystals: Chemical composition gradient and single-step capping

作者：Wan, Zhen[1]; Luan, Weiling[1]; Tu, Shan-Tung[1]

机构：[1] Key Laboratory of Pressure Systems and Safety [MOE], School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China

年份：2011

卷号：356

期号：1

起止页码：78

外文期刊名：Journal of Colloid and Interface Science

收录：EI(收录号：20110613654509)

语种：英文

外文关键词：Chemical reactors - Cadmium sulfide - Oleic acid - Tellurium compounds - Infrared devices - Zinc sulfide - Blending - II-VI semiconductors - Nanocrystals

摘要：A capillary microreactor was firstly utilized to continuously synthesize near-infrared emitting CdSexTe1-x nanocrystals (NCs). By using trioctylphosphine oxide and trioctylphosphine as the solvents for anion precursor as well as oleic acid and oleylamine as the solvents for cation precursor, high quantum yield zinc-blend CdSexTe1-x NCs with a chemical composition gradient internal structure and tunable emission from 634 to 783nm were synthesized. Thus, the nonlinear relationship between the composition and the emission energies were verified. Moreover, a facile single-step capping approach was developed by using the dissolution of cadmium oxide and free element sulfur in oleic acid, and a very thin CdS shell was successfully epitaxial grown around the as-prepared CdSexTe1-x NCs to enhance the photostability. After the capping process, the core/shell structured CdSexTe1-x/CdS NCs remained 15-40% of their initial PL intensity after 3h of illumination. ? 2011 Elsevier Inc.