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Synthesis of Fe3O4–Ag nanocomposites and their application to enzymeless hydrogen peroxide detection

Cheng-Cheng Qi and Jian-Bin Zheng

aShaanxi Provincial Key Laboratory of Electroanalytical Chemistry, Institute of Analytical Science, Northwest University, Xi’an, Shaanxi 710069, China

 

E-mail: zhengjb@nwu.edu.cn

Abstract: To achieve highly sensitive nonenzymatic detection of H2O2, a novel electrochemical sensor based on Fe3O4–Ag nanocomposites was developed. Nanocomposites were synthesized by reducing [Ag(NH3)2]+ at the gas/liquid interface in the presence of silver seeds and confirmed by transmission electron microscopy and X-ray diffractometry. Electrochemical investigations indicate that the sensor is able to detect H2O2 within a wide linear range of 0.5 μM to 4.0 mM, sensitivity of 135.4 μA mM−1 cm−2 and low detection limit of 0.2 μM (S/N = 3). Additionally, the sensor exhibits good anti–interference ability, stability and repeatability. These results show that the Fe3O4–Ag nanocomposite is a promising electrocatalytic material for sensors construction.

Keywords: silver nanoparticles – ferroferric oxide – hydrogen peroxide – nonenzymatic sensor

Full paper is available at www.springerlink.com.

DOI: 10.1515/chempap-2015-0224

 

Chemical Papers 70 (4) 404–411 (2016)

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