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Issue 24, 2016
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New insights into the electrochemical detection application of p–p junction foam: the effects of the interfacial potential barrier

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Abstract

3D NiO/Co3O4 p–p junction foam was fabricated and applied for electrochemical detection of biomarkers. The theoretical model of employing the interfacial potential barrier as an electrochemical tuning factor was explored in depth. The signals of different targets with similar redox properties could be controllably distinguished by depressing or strengthening the potential barrier. The absorbed positively charged molecules would induce negative charges, inciting a decrease of the potential barrier height Φ and resistance, which is an enhanced tuning factor of the electrochemical signal. However, the effects of the absorbed negatively charged molecules went completely in the inverse direction; the resistance increased following by the increased Φ, which is a weakened tuning factor. Furthermore, the optimum adjustive effects of the p–p junction were validated as both the p-type regions are fully exposed. It is a general strategy to solve the difficulty in selective electrochemical detection of an analyte with similar redox properties. The results build a bridge to connect the potential barrier and electrochemical detection.

Graphical abstract: New insights into the electrochemical detection application of p–p junction foam: the effects of the interfacial potential barrier

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Publication details

The article was received on 19 Aug 2016, accepted on 29 Sep 2016 and first published on 30 Sep 2016


Article type: Paper
DOI: 10.1039/C6AN01856D
Citation: Analyst, 2016,141, 6515-6520
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    New insights into the electrochemical detection application of p–p junction foam: the effects of the interfacial potential barrier

    L. Ding, M. Zhao, S. Fan, H. Li, Y. Ma, J. Liang and S. Chen, Analyst, 2016, 141, 6515
    DOI: 10.1039/C6AN01856D

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