Journal
MICROCHIMICA ACTA
Volume 180, Issue 5-6, Pages 461-468Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-013-0949-z
Keywords
Gold; Graphene; Hydroquinone; Catechol; Voltammetry
Categories
Funding
- National Research Foundation for the Doctoral Program of Higher Education of China [20120131110009]
- National Natural Science Foundation of China [21175059]
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We have synthesized a virtually monodisperse gold-graphene (Au-G) nanocomposite by a single-step chemical reduction method in aqueous dimethylformamide solution. The nanoparticles are homogenously distributed over graphene nanosheets. A glassy carbon electrode was modified with this nanocomposite and displayed high electrocatalytic activity and extraordinary electronic transport properties due to its large surface area. It enabled the simultaneous determination of hydroquinone (HQ) and catechol (CC) in acetate buffer solution of pH 4.5. Two pairs of well-defined, quasi-reversible redox peaks are obtained, one for HQ and its oxidized form, with a 43 mV separation of peak potentials (Delta E-p), the other for CC and its oxidized form, with a Delta E-p of 39 mV. Due to the large separation of oxidation peak potentials (102 mV), the concentrations of HQ and CC can be easily determined simultaneously. The oxidation peak currents for both HQ and CC increase linearly with the respective concentrations in the 1.0 mu M to 0.1 mM concentration range, with the detection limits of 0.2 and 0.15 mu M (S/N = 3), respectively. The modified electrode was successfully applied to the simultaneous determination of HQ and CC in spiked tap water, demonstrating that the Au-G nanocomposite may act as a high-performance sensing material in the selective detection of some environmental pollutants.
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