A facile method for the preparation of modified indium tin oxide (ITO) electrodes and their use in amperometric sensing of H 2O 2 are described. ITO surface was first derivatized by acid-catalyzed grafting of N-hydroxysuccinimidyl-ester-functionalized methallylsilane at room temperature, followed by immobilization of functional materials such as gold nanoparticle and thionine by amide coupling reaction. The modification process was monitored using contact angle, scanning electron microscopy and electrochemical measurements, which revealed the controllability and high efficiency of this modification method. Thionine-modified ITO electrode exhibited excellent electrocatalytic activity towards the reduction and amperometric determination of H 2O 2, demonstrating the potential of this modification strategy in electrocatalysis and amperometric sensing.
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