title: New insights into the electrochemical detection application of p-p junction foam: the effects of the interfacial potential barrier.
abstract: 3D NiO/Co3O4p-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.
authors.affiliation: Department of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, PR China. zhaomg@ouc.edu.cn sgchen@ouc.edu.cn.
authors.forename: Longjiang
authors.initials: L
authors.lastname: Ding
authors.affiliation: Department of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, PR China. zhaomg@ouc.edu.cn sgchen@ouc.edu.cn.
authors.forename: Minggang
authors.initials: M
authors.lastname: Zhao
authors.affiliation: Department of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, PR China. zhaomg@ouc.edu.cn sgchen@ouc.edu.cn.
authors.forename: Sisi
authors.initials: S
authors.lastname: Fan
authors.affiliation: Optoelectronic Materials and Technologies Engineering Laboratory of Shandong, Physics Department, Qingdao University of Science and Technology, Qingdao 266100, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: Department of chemistry, Imperial College London, London, SW7 2AZ, UK.
authors.forename: Ye
authors.initials: Y
authors.lastname: Ma
authors.affiliation: Department of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, PR China. zhaomg@ouc.edu.cn sgchen@ouc.edu.cn.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Liang
authors.affiliation: Department of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, PR China. zhaomg@ouc.edu.cn sgchen@ouc.edu.cn.
authors.forename: Shougang
authors.initials: S
authors.lastname: Chen
mesh_terms: D015374:Biosensing Techniques; D055664:Electrochemical Techniques; D010084:Oxidation-Reduction