Amperometric H2O2 sensor based on gold nanoparticles/poly (celestine blue) nanohybrid film

The present paper demonstrates a significant hybrid nanofilm using gold nanoparticles (GNPs) and poly celestine blue (PCB) as an effective sensing material for hydrogen peroxide (H2O2). The surface assembly of the nanocatalyst GNPs provides greater surface area for improved layering of PCB on the electrode surface. Cyclic voltammetry, UV visible spectroscopy and field emission scanning electron microscopy studies confirmed the structure and morphology of the synthesized GNPs. Cyclic voltammetric characterization of the fabricated GNPs/PCB electrode was performed and under optimal conditions they exhibited enhanced electrochemical sensing towards H2O2 with better sensitivity and detection limit as 0.22 µA/µM and 3.9 × 10−6 M (S/N = 3). The interference studies using the GNPs/PCB modified electrode interprets the selectivity of the electrode towards H2O2. The proposed sensor was highly stable and was effectively applied for analysis of H2O2 in real samples.