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Lack of nano size effect on electrochemistry of dopamine at a gold nanoparticle modified indium tin oxide electrode

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Abstract

Nanometer sized materials have been shown to possess excellent chemical and electrochemical catalytic properties. In this work, a gold nanoparticle (AuNP) modified indium tin oxide (ITO) electrode was employed for investigating its electro-catalytic property. AuNP was deposited on the 3-aminopropyltriethoxysilane (APTES) modified ITO electrode by self-assembly, and was characterized by scanning electron microscopy and cyclic voltammetry. Although the electrochemical reaction of dopamine was very sluggish on the ITO/APTES electrode, it was significantly enhanced after AuNP deposition. The cyclic voltammogram exhibited apparent dependence on the surface coverage of 11 nm AuNPs, which could be rationalized by different modes of mass diffusion. Among the different sizes of AuNP investigated, the lowest anodic peak potential was observed on 11 nm AuNP. However, the potential was still about 50 mV more positive than that obtained on a bulk gold electrode of similar geometry. It is therefore concluded that there is no nanometer size effect of AuNP modified ITO on the electrochemistry of dopamine.

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Authors and Affiliations

  1. State Key Laboratory of Environmental Chemistry and Ecotoxicology; Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China

    RongFu Huang & Liang-Hong Guo

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  1. RongFu Huang
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  2. Liang-Hong Guo
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Correspondence to Liang-Hong Guo.

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Huang, R., Guo, LH. Lack of nano size effect on electrochemistry of dopamine at a gold nanoparticle modified indium tin oxide electrode. Sci. China Chem. 53, 1778–1783 (2010). https://doi.org/10.1007/s11426-010-3159-0

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  • DOI: https://doi.org/10.1007/s11426-010-3159-0

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