An ultrasensitive iron(III)-complex based hydrogen peroxide electrochemical sensor based on a nonelectrocatalytic mechanism |
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Authors: | Pan Li Yu DingZhaoyang Lu Yu ChenYiming Zhou Yawen TangChenxin Cai Tianhong Lu |
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Institution: | Jiangsu Key Laboratory of New Power Batteries, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, PR China |
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Abstract: | In this communication, the first nonelectrocatalysis-type hydrogen peroxide electrochemical sensor is reported. The electroactive iron(III) diethylenetriaminepentaacetic acid (DTPA-FeIII) complex is immobilized on the cysteamine (cys) modified nanoporous gold (NPG) films by covalent method. The immobilized DTPA-FeIII complex quickly communicates an electron with the electrode. Upon addition of hydrogen peroxide, however, hydrogen peroxide inhibits the direct electron transfer of the DTPA-FeIII complex due to the generation of nonelectroactive DTPA-FeIII–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 × 10–14 M) and wide linear range (1.0 × 10–13 to 1.0 × 10–8 M) with excellent reproducibility and stability. |
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Keywords: | Iron(III)-complex Direct electron transfer Quenching mechanism Hydrogen peroxide Electrochemical sensor |
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