Photoacoustic Study of Optical and Thermal Properties of CdTe Quantum Dots

Abstract

The optical and thermal properties of CdTe quantum dots (QDs) of different particle size are measured using photoacoustic technique (PA). CdTe (QDs) were synthesized using the chemical deposition method (CD).The PA spectra show a blue shift as the sizes of CdTe QDs decrease which is in close agreement with that obtained by UV-Visible spectrophotometry. The sizes of the nano-particles were estimated using effective mass approximation (EMA) model giving radii ranging from 2.13 nm to 2.43 nm. The estimated values are comparable to those obtained by transmission electron microscope (TEM). The thermal diffusivity (D), thermal effusivity (e), and thermal conductivity (k) of all CdTe samples were also studied by PA technique. The determined values of D and k are at least one order of magnitude larger than the bulk value.