Hydrogen peroxide sensor based on Prussian blue electrodeposited on (3-mercaptopropyl)-trimethoxysilane...

A hydrogen peroxide (H(2)O(2)) sensor was developed by electrodepositing Prussian blue (PB) on a gold electrode modified with (3-mercaptopropyl)-trimethoxysilane (MPS) polymer. The characterization of the self-assembled electrode was investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The results of electrochemical experiments showed that such constructed sensor had a favorable catalytic ability to reduce H(2)O(2). The MPS film on the modified gold electrode greatly enhanced the pH-adaptive range of PB. Large surface-to-volume ratio property of double-layer 2d-network MPS-modified PB electrode enabled stable and highly sensitive performance of the non-enzymatic H(2)O(2) sensor. The linear range of H(2)O(2) determined is from 2.0 × 10(-6) to 2.0 × 10(-4) mol L(-1) with a correlation coefficient of 0.9991 and a detection limit for H(2)O(2) of 1.8 × 10(-6) mol L(-1). The influences of the potentially interfering substances on the determination of H(2)O(2) were investigated. This modified electrode exhibits a good selectivity and high sensitivity with satisfactory results.