Abstract
A sandwich structured nanocomposite consisting of mildly reduced graphene oxide modified with silver nanoparticles supported on Co3O4 was synthesized and used for fabricating a nonenzymatic sensor for H2O2. The morphology and composition of the nanocomposite was characterized by transmission electron microscopy, scanning electron microscopy, X-ray powder diffraction and FTIR. The composite was placed on a glassy carbon electrode which then displayed excellent performance in terms of electroreduction of H2O2. The H2O2 sensor, if operated at pH 7.4 at a working potential of 0.4 V (vs. SCE) has the following features: (a) linearity in the 0.1 μM to 7.5 mM concentration range; (b) a sensitivity of 146.5 μA∙mM‾1∙cm‾2; (c) a 35 nM detection limit at a signal-to-noise ratio of 3, and (d) a response time of 2 s. The sensor is long-term stable, well reproducible and selective.
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Acknowledgments
The authors gratefully acknowledge the financial support of this project by the National Science Fund of China (Nos. 21275116, 21575113), the Specialized Research Fund for the Doctoral Program of Higher Education (Nos. 20126101120023), the Natural Science Fund of Shaanxi Province in China (No. 2013KJXX-25), and the Scientific Research Foundation of Shaanxi Provincial Key Laboratory (Nos. 13JS097, 14JS094, and 15JS100).
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Wu, Q., Sheng, Q. & Zheng, J. Nonenzymatic amperometric sensing of hydrogen peroxide using a glassy carbon electrode modified with a sandwich-structured nanocomposite consisting of silver nanoparticles, Co3O4 and reduced graphene oxide. Microchim Acta 183, 1943–1951 (2016). https://doi.org/10.1007/s00604-016-1829-0
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DOI: https://doi.org/10.1007/s00604-016-1829-0