High Pressure Raman Spectroscopic Studies on CuInTe$_{2}$ Quantum Dots
POSTER
Abstract
High pressure Raman spectroscopy studies were performed on CuInTe$_{2}$ Quantum Dots (QD) up to 7.7 GPa. At ambient conditions, the Raman modes of the QD loaded into a high-pressure diamond anvil cell (DAC) were observed at 125.1 cm$^{-1}$ (A$_{1}$ mode) and 142.8 cm$^{-1}$ (B$_{2}$ or E mode). As the pressure increases, the A$_{1}$ mode starts to split above 2 GPa and shifts to the left as indication of a structural change. A pressure-induced phase transition was observed around 2.9 GPa due to the collapse of the modes with the appearance of a new Raman peaks. The phase transition observed in our experiments compare well with the characteristics of bulk and larger nanoparticles. Further, it could be concluded that the phase transition pressure observed mainly depends on the particle size.
*H.Y. thanks McNair foundation for fellowship award. He also acknowledges Melanie White, Jason Baker and Phuc Tran for help in the experiments. He thanks Michael Pravica for using the Raman facility.