Water-soluble CdTe nanocrystals under high pressure
2015
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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