Amperometric Nitrite Sensor Based on PVP‐Os Entrapped in Titania Sol‐Gel Matrix

Abstract

Abstract A novel nitrite sensor was developed based on the immobilization of a partially quaternized poly(4‐vinylpyridine) complexed with [Os(bpy) 2 Cl] +/2+ (PVP‐Os) in a porous TiO 2 sol‐gel matrix by a vapor deposition method. The preparation process simplified the traditional sol‐gel process and prevented the cracking of conventional sol‐gel derived glasses. Electrochemical behavior of the sensor was characterized by cyclic voltammetry and shows excellent electrocatalytic response for the reduction of nitrite. Effect of operating potential on electrochemical responses of the sensor was explored for optimum analytical performance by using the amperometric method. The stability of the sensor was also evaluated.