Abstract
A novel electrochemical sensor for para-nitrophenol (p-NP) was constructed with graphene–Au composite containing 10 % Au (G–Au 10 %). In the composite, Au nanoparticles with the size of ca. 11 nm were regularly scattered on graphene sheet without aggregation, which offers dramatically higher electrocatalytic activity on the redox of K3[Fe(CN)6]/K4[Fe(CN)6] couple than sole Au nanoparticles. Compared to sole Au nanoparticles, the G–Au 10 % also exhibited dramatically improved electrocatalytic activity on the reduction of p-NP. Amperometric detection of p-NP at G–Au 10 % modified electrode displayed a wide linear range of 0.47–10.75 mM with detection limit of 0.47 μM and a high sensitivity of 52.85 μA/mM. Considering the thrifty in utilization of noble Au, the G–Au 10 % can be successfully applied as a low-cost and powerful sensing material for trace detection of p-NP.
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Acknowledgments
This work was supported by the Natural Science Foundation of China (No. 61176004), Science and Technology Breakthrough Program of Henan Province (No. 112300410094) and Natural Science Foundation of Education Department of Henan Province (No. 2010B150012, 2011A150017).
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Zhang, W., Chang, J., Chen, J. et al. Graphene–Au composite sensor for electrochemical detection of para-nitrophenol. Res Chem Intermed 38, 2443–2455 (2012). https://doi.org/10.1007/s11164-012-0560-7
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DOI: https://doi.org/10.1007/s11164-012-0560-7