Water-Soluble CdTe Nanocrystals under High Pressure

被引：5
作者：
Lin, Yan-Cheng [1 ]
机构：
[1] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30010, Taiwan
来源：
QUANTUM DOTS AND NANOSTRUCTURES: SYNTHESIS CHARACTERIZATION AND MODELING XII | 2015年 / 9373卷
关键词：
water soluble; CdTe; colloidal quantum dots; high pressure; phase transition; nonradiative energy transfer; SOLID PHASE-TRANSITION; SEMICONDUCTOR NANOCRYSTALS; ENERGY-TRANSFER; SIZE DEPENDENCE; WURTZITE;
D O I：
10.1117/12.2079540
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The application of static high pressure provides a method for precisely controlling and investigating many fundamental and unique properties of semiconductor nanocrystals (NCs). This study systematically investigates the high-pressure photoluminescence (PL) and time-resolved carrier dynamics of thiol-capped CdTe NCs of different sizes, at different concentrations, and in various stress environments. The zincblende-to-rocksalt phase transition in thiol-capped CdTe NCs is observed at a pressure far in excess of the bulk phase transition pressure. Additionally, the process of transformation depends strongly on NC size, and the phase transition pressure increases with NC size. These peculiar phenomena are attributed to the distinctive bonding of thiols to the NC surface. In a nonhydrostatic environment, considerable flattening of the PL energy of CdTe NCs powder is observed above 3.0 GPa. Furthermore, asymmetric and double-peak PL emissions are obtained from a concentrated solution of CdTe NCs under hydrostatic pressure, implying the feasibility of pressure-induced interparticle coupling.
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页数：7
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