title: A novel non-enzyme hydrogen peroxide sensor based on catalytic reduction property of silver nanowires.
abstract: A novel strategy to fabricate a hydrogen peroxide (H2O2) sensor was developed based on silver nanowires modified Pt electrode. The sensor was fabricated by simple casting of silver nanowires (Ag NWs) aqueous solution on a Pt electrode. Silver nanowires were synthesized by an l-cysteine-assisted poly (vinyl pyrrolidone) (PVP)-mediated polyol route. UV-vis spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to investigate the prepared nanowires. The electrochemical properties of H2O2 sensor were evaluated by cyclic voltammetry (CV) and chronoamperometry. The as-obtained silver nanowires exhibited favorable electroreduction activity toward H2O2, and results indicated that the Ag NWs modified Pt (Ag NWs/Pt) electrode might be gifted from CV scanning with higher surface area and more active sites that afford more effective surface exposure in the electrode-electrolyte interface and consequently improved electrochemical properties. At the applied potential of -0.2V vs. Ag/AgCl, the Ag NWs/Pt electrode as an enzyme-free sensor exhibited a wide linear range of 0.5μM-30mM to H2O2, with a remarkable sensitivity of 9.45μA/mM, a detection limit of 0.2μM estimated at a signal-to-noise ratio of 3 and fast response time (within 5s). Moreover, it showed good reproducibility, anti-interferant ability and long-term stability. The excellent performance of the sensor might be attributed to the well-defined silver nanowires with special catalytic activity.
authors.affiliation: School of Geography and Tourism, Qufu Normal University, Rizhao 276826, China; The Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University, Tianjin 300071, China.
authors.forename: Xia
authors.initials: X
authors.lastname: Qin
authors.affiliation: State Key Laboratory of Hollow Fiber Membrane Materials and Process, Tianjin Polytechnic University, Tianjin 300160, China. Electronic address: wanghuicai@tjpu.edu.cn.
authors.forename: Huicai
authors.initials: H
authors.lastname: Wang
authors.affiliation: The Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University, Tianjin 300071, China.
authors.forename: Zhiying
authors.initials: Z
authors.lastname: Miao
authors.affiliation: School of Geography and Tourism, Qufu Normal University, Rizhao 276826, China.
authors.forename: Junli
authors.initials: J
authors.lastname: Li
authors.affiliation: The Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University, Tianjin 300071, China. Electronic address: qiangchen@nankai.edu.cn.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Chen
mesh_terms: D015374:Biosensing Techniques; D002384:Catalysis; D055664:Electrochemical Techniques / Q000379:methods; D004566:Electrodes; D006861:Hydrogen Peroxide / Q000737:chemistry*; D057230:Limit of Detection; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053770:Nanowires / Q000737:chemistry*; D015203:Reproducibility of Results; D059629:Signal-To-Noise Ratio; D012834:Silver / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D012834:Silver; D006861:Hydrogen Peroxide
keywords: Electroreduction; Hydrogen peroxide; Non-enzyme; Silver nanowires