Cadmium sulfide quantum dots in water media: Enhanced photoluminescence, dispersion and stability

Within the presented study, we have investigated the effect of the ligand shell on the stability and optical properties of cadmium sulfide (CdS) quantum dots in a water colloidal solution stabilized by 3-mercapto propyltrimethoxysilane (MPS). The correlation between stability and parameters of nanoparticles, namely, hydrodynamic radius, nucleus size and zeta-potential has been established. The optimal synthe-sis conditions of stable colloidal solutions shown the luminescence have been found. The mechanism of structural organization of the organic MPS shell, its bonding to the semiconductor nanoparticle surface and influence on the agglomeration have been developed. The mechanism of MPS capped CdS QDs lumi-nescence switch on in water solution by pH control was proposed.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

In this study, the impact of the ligand shell on the stability and optical properties of CdS quantum dots in a water colloidal solution stabilized by MPS was investigated. The relationship between stability and nanoparticle parameters including hydrodynamic radius, nucleus size, and zeta-potential was established. The optimal synthesis conditions for stable colloidal solutions with luminescence were identified. The mechanism of the organic MPS shell's structural organization, bonding to the semiconductor nanoparticle surface, and its influence on agglomeration were developed. Additionally, a mechanism for switching on the luminescence of MPS-capped CdS quantum dots in water solution through pH control was proposed.