Electroanalytical Study of SSeNPs-CGA-FTO Electrochemical Sensor Towards the Detection of H2O2

A commercial graphene-amine (CGA) and synthesized selenium nanoparticle (SSeNP) nanocomposite coated on the surface of fluorine-doped tin oxide (SSeNPs-CGA-FTO) substrate was developed by spin coating for H2O2 detection. The CGA-FTO and SSeNPs-CGA-FTO electrochemical sensors were characterized using FESEM with EDAX analysis. FESEM analysis showed nanotube and fluffy morphology of the SSeNPs and CGA, respectively. The developed CGA-FTO and SSeNPs-CGA-FTO electrochemical sensors were used for the sensing of hydrogen peroxide by chronoamperometry (CA) in NaOH (0.1 N) electrolyte. The sensors showed a linear response range from 0.1 mM to 20 mM with sensitivity of 101.7 mA mM(-1) cm(-2) (R-2 = 0.9931) and 137.9 mA mM(-1) cm(-2) (R-2 = 0.9956). The CGA-FTO and SSeNPs-CGA-FTO showed a very low detection limit of 0.1 mM and 0.05 mM, respectively, with a detection response time of less than 1 s. The interference study of the SSeNPs-CGA-FTO-based sensors showed higher selectivity towards H2O2 with interfering agents as compared with CGA-FTO.