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New method for preparation of polyoxometalate-capped gold nanoparticles, and their assembly on an indium-doped tin oxide electrode

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Abstract

Functionalized gold nanoparticles capped with polyoxometalates were prepared by a simple photoreduction technique where phosphododecamolybdates serve as reducing reagents, photocatalysts, and as stabilizers. TEM images of the resulting gold nanoparticles show the particles to have a relative narrow size distribution. Monolayer and multilayer structures of the negatively charged capped gold nanoparticles were deposited on a poly(vinyl pyridine)-derivatized indium-doped tin oxide (ITO) electrode via the layer-by-layer technique. The surface plasmon resonance band of the gold nanoparticles displays a blue shift on the surface of the ITO electrode. This is due to the substrate-induced charge redistribution in the gold nanoparticles and a change in the electromagnetic coupling between the assembled nanoparticles. The modified electrode exhibits the characteristic electrochemical behavior of surface-confined phosphododecamolybdate and excellent electrocatalytic activity. The catalysis of the modified electrode towards the model compound iodate was systematically studied. The heterogeneous catalytic rate constant for the electrochemical reduction of iodate was determined by chronoamperometry to be ca. 1.34 × 105 mol−1·L·s−1. The amperometric method gave a linear range from 2.5 × 10−6 to 1.5 × 10−3 M and a detection limit of 1.0 × 10−6 M. We believe that the functionalized gold nanoparticles prepared by this photoreduction technique are advantageous in terms of fabrication of sensitive and stable redox electrodes.

Functionalized gold nanoparticles (Au-NPs) capped with polyoxometalates were prepared by a simple photoreduction technique. The negatively charged capped Au-NPs were deposited on a poly(vinyl pyridine)-derivatized indium-doped tin oxide electrode via the layer-by-layer technique. The modified electrode exhibits the characteristic electrochemical behavior of surface-confined phosphododecamolybdate, and excellent catalytic activity.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 30872442).

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Authors and Affiliations

  1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China

    Yu Cheng, Junwei Zheng, Zhenping Wang, Liu Liu & Ying Wu

  2. Department of Anesthesiology, First Affiliated Hospital of Soochow University, Suzhou, 215006, China

    Jianping Yang

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  1. Yu Cheng
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  2. Junwei Zheng
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  3. Zhenping Wang
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  4. Liu Liu
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  5. Ying Wu
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Correspondence to Ying Wu or Jianping Yang.

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Cheng, Y., Zheng, J., Wang, Z. et al. New method for preparation of polyoxometalate-capped gold nanoparticles, and their assembly on an indium-doped tin oxide electrode. Microchim Acta 173, 529–535 (2011). https://doi.org/10.1007/s00604-011-0589-0

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