CdS nanocrystal induced chemiluminescence: reaction mechanism and applications

摘要

Water-soluble CdS nanocrystals (NCs) capped with mercaptoacetic acid ( MA) were synthesized in aqueous solution. Hydrogen peroxide directly oxidized the MA-capped CdS NCs and produced strong chemiluminescence ( CL) emission in basic conditions. It was found that the CL of CdS NCs was size-dependent, and the CL intensity increased with increasing CdS NCs size. UV - visible spectra, CL spectra, photoluminescence (PL) spectra, and transmission electron microscopy (TEM) were used to investigate the CL reaction mechanism. Moreover, the effects of reactant concentrations, surfactants, and some biological molecules and metal ions were carefully investigated. Some biological molecules and metal ions were observed to inhibit the CL signal of the H2O2 - CdS NCs system, which makes it applicable for the detection of such species.