Journal
ELECTROCHIMICA ACTA
Volume 117, Issue -, Pages 322-328Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.11.175
Keywords
Graphene; Gold nanorod; Electrochemical sensor; Ractopamine
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Funding
- Shaanxi province Ke Ji Tong Chou Chuang Xin project [2011KTZB03-03-01-02]
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Well-dispersed graphene/gold nanorod (G/GNR) composites were synthesized by directly reducing a mixture of graphene and gold growth solution with sodium borohydride. The synthesized G/GNR composites were characterized by ultraviolet-visible spectroscopy and Fourier transform infrared spectroscopy, and the composites were observed by transmission electronic microscopy, which revealed that the GNRs were self-assembled onto the surface of graphene sheets. Glassy carbon electrodes were modified with G/GNR composites to construct a ractopamine electrochemical sensor. A sensitive, rapid, and simple electrochemical method was developed for the detection of ractopamine based on the strong enhancement effect of G/GNRs. The peak currents varied linearly with the concentration of ractopamine over the range of 1 x 10(-9) to 2.7 x 10(-6) mol L-1, and the detection limit was 5.1 x 10(-10) mol L-1 (S/N = 3). This method was applied to detect the content of ractopamine in swine urine samples, and the recovery was in the range of 99.2 to 107.3%. (C) 2013 Elsevier Ltd. All rights reserved.
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