ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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)