Temperature Sensitivity of Water-Soluble CdTe and CdSe/ZnS Quantum Dots Incorporated into Biopolymer Submicron Particles

摘要

Polymer particles with sizes 0.3–0.4 μm are synthesized based on chitosan and chondroitin sulfate withincorporated CdTe (core) and CdSe/ZnS (core–shell) quantum dots. Their morphological and spectralproperties are investigated by the methods of dynamic scattering, electron microscopy, and absorption andluminescence spectroscopy at temperatures from 10 to 80°С. Spectral effects associated with a change intemperature (a red shift and a decrease in the amplitude of the photoluminescence spectrum) can be explainedby the temperature expansion of the quantum dots and activation of surface traps. It is shown that thetemperature sensitivity of spectra of the quantum dots incorporated into the biopolymer particles is not lessthan in water. To develop an optical temperature sensor, the core quantum dots are more preferable than thecore–shell quantum dots