Luminescence method to characterize the synthesis of ZnCdS quantum dots in real time

Abstract

Studying the methods for the synthesis of nanoparticles are known, but to obtain nanoparticles with specified properties that allow them to be used as a biosensor is something totally different. Many problems arise associated with the implementation of the technique for creating reproducible and time-stable nanostructures. For investigation the effectiveness of the synthesis method on the state of nanoparticles and their optical characteristics, we synthesized ZnCdS, nanoparticles by various methods, and also studied their size, structure, absorption and luminescence spectra. The results show that the aggregation of Cd in the ZnS lattice causes distortions that eventually produce structural changes. The synthesis of Zn 1-x Cd x S, nanoparticles at x < 0.25, does not allow obtaining nanoparticles with a maximum wavelength of the luminescence band of more than 800 nm. While at x > 0.25, the intensity of the luminescence bands decreases sharply. This shift is due to a distortion of the luminescent energy states and surface defects.