Peroxidase-like behavior, amperometric biosensing of hydrogen peroxide and photocatalytic activity by cadmium sulfide nanoparticles

A convenient solvothermal route has been developed for the synthesis of CdS nanoparticles (NPs) using a cadmium (II) complex [Cd(ACDA)2] of 2-aminocyclopentene-1-dithiocarboxylic acid (HACDA). Decomposition of the precursor complex has been carried out by ethylenediamine (EN), hexadecylamine (HDA) or dimethyl sulfoxide (DMSO). Structural analyses reveal the formation of crystalline nanoparticles with rod-like shape from EN and spherical shape from HDA or DMSO as solvents, while the optical properties suggest the quantum confinement by the nanoparticles. Superior photocatalytic activity towards the degradation of aqueous Rose Bengal (RB) solution has been achieved with the use of CdS NPs as photocatalyst under light irradiation. CdS NPs is found to possess peroxidase-like activity that can catalyze the oxidation of the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H2O2 to produce a blue color reaction. CdS NPs anchored on glassy carbon (GC) electrodes have been prepared to study the electrocatalytic reduction of H2O2 in phosphate buffer solution. This modified electrode has also been used as amperometric biosensor for the detection of H2O2.

CdS nanoparticles were prepared by the decomposition of a precursor complex [Cd(ACDA)2] using ethylenediamine, hexadecylamine or dimethyl sulfoxide as structure directing solvents. Catalytic oxidation of TMB, photocatalytic decomposition of RB and amperometric detection of H2O2 has been studied using the as prepared CdS NPs.Figure optionsDownload high-quality image (257 K)Download as PowerPoint slideHighlights
► CdS NPs by decomposition of a single-source precursor [Cd(ACDA)2].
► EN, HDA and DMSO have been used as structure directing solvents.
► Effective photocatalytic activity towards the decomposition of RB.
► Biomimic peroxidase behavior of CdS NPs.
► CdSNPs/GC electrode performs excellent amperometric sensor for H2O2.