Development of novel electrochemical sensor based on PtNPs-SeNPs-FTO nanocomposites via electrochemical deposition for detection of hydrogen peroxide

Abstract

The PtNPs-SeNPs-FTO nanocomposites as electrochemical sensor was developed via electrochemical deposition method for hydrogen peroxide detection. The synthesis and growth of selenium nanoparticles (SeNPs), platinum nanoparticles (PtNPs) and nanocomposites of PtNPs-SeNPs on fluorine doped tin oxide (FTO) substrate by using electrochemical deposition for H2O2 detection was reported. Morphological and structural study of bare FTO, PtNPs-FTO, SeNPs-FTO and PtNPs-SeNPs-FTO sensor was confirmed by FEGSEM, EDS mapping, and XPS. Morphology of synthesized PtNPs and SeNPs decorated on the FTO surface showed nano-flower structure and spherical in shape respectively. The XPS analysis was carried out to identify elemental composition on the surface-modified PtNPs-SeNPs-FTO sensor. The survey spectra of PtNPs-SeNPs-FTO electrode displayed a considerable strong peak of C, F, Sn, O, Pt, and Se, which confirmed the existence of these elements on the FTO surface. The synthesized SeNPs-FTO, PtNPs-FTO, and PtNPs-SeNPs-FTO sensor displayed wide range of linear concentration response from 0.01 to 40 mM and response time 0.5 s. The synthesized SeNPs-FTO, PtNPs-FTO and PtNPs-SeNPs-FTO sensor showed sensitivity of 0.4 µA mM−1 cm−2 (R2 =0.9904), 17.2 µA mM−1 cm−2 (R2 =0.9917) and 7.3 µA mM−1 cm−2 (R2 = 0.9835) respectively. The SeNPs-FTO, PtNPs-FTO and PtNPs-SeNPs-FTO based sensor also demonstrated high selectivity towards detection of H2O2 with interfering agents.