An ultrasensitive iron(III)-complex based hydrogen peroxide electrochemical sensor based on a nonelectrocatalytic mechanism

作者：Li, Pan; Ding, Yu; Lu, Zhaoyang; Chen, Yu^*; Zhou, Yiming; Tang, Yawen; Cai, Chenxin; Lu, Tianhong

来源：Analytica Chimica Acta, 2013, 786: 34-38.

DOI：10.1016/j.aca.2013.05.029

• Iron(III)-complex
• Direct electron transfer
• Quenching mechanism
• Hydrogen peroxide
• Electrochemical sensor

In this communication, the first nonelectrocatalysis-type hydrogen peroxide electrochemical sensor is reported. The electroactive iron(III) diethylenetriaminepentaacetic acid (DTPA-Fe-III) complex is immobilized on the cysteamine (cys) modified nanoporous gold (NPG) films by covalent method. The immobilized DTPA-Fe-III complex quickly communicates an electron with the electrode. Upon addition of hydrogen peroxide, however, hydrogen peroxide inhibits the direct electron transfer of the DTPA-Fe-III complex due to the generation of nonelectroactive DTPA-Fe-III-H2O2 complex. Based on quenching mechanism, the first hydrogen peroxide electrochemical sensor based on a nonelectrocatalytic mechanism is developed. The novel hydrogen peroxide electrochemical sensor has the ultralow detection limit (1.0 x 10(-14) M) and wide linear range (1.0 x 10(-13) to 1.0 x 10(-8) M) with excellent reproducibility and stability.

• 出版日期2013-7-5
• 单位南京师范大学