INFLUENCE OF SYNTHESIS CONDITIONS ON THE PROPERTIES OF CdS NANOPARTICLES

Abstract

Semiconductor nanocrystals have diverse practical applications, including optoelectronic transistor components and fluorescent biological labels. Relevant materials exhibit good photomechanical features for laser operation basically due to good photo-thermal stability against external laser radiation combined with high phonon anharmonicity being typical for chalcogenides. In this work, we compare the morphology of cadmium sulfide (CdS) nanocrystallines (NCs) synthesized electrochemically both with PVS and ATLAS G3300 detergent, i.e. detergent electrolytic synthesis methods. Presents the structural and morphological features of CdS NCs as well as their second-order nonlinear optical properties explored in SHG experiments. Describes the methodology of CdS NC synthesis, experimental techniques applied in structural studies of Cd NCs, such as X-ray powder diffraction and scanning electron microscopy. Аnalysis shows that synthesized CdS NCs are characterized either hexagonal or cubic structures corresponding to wurtzite or sphalerite type, respectively. An approximate content of wurtzite and sphalerite NCs is given. CdS of wurtzite structure (P63mc) evidently dominates here. Moreover, an applying of ATLAS G3300 detergent in NC synthesis results to practically constant ratio (3:1) of wurtzite to sphalerite NCs. The electrolysis current density, practically does not affect the ratio of wurtzite and sphalerite modifications in the resulting CdS. In with work demonstrate SEM images of CdS NC powders. It was established that the addition of Atlas G3300 stabilizer to the electrolyte contributes to the reduction of particle size and the degree of polydispersity. The nonlinear optical responses of CdS were investigated to better understand the nonlinear optical properties, which are very important for applications (e.g., biosensors). One may see that the grain size exhibits rather significant effect on the intensity of the SHG signal. Fractions of finer powder particles give lower SHG signals.