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

Content Provider	Springer Nature Link
Author	Cheng, Yu Zheng, Junwei Wang, Zhenping Liu, Liu Wu, Ying Yang, Jianping
Copyright Year	2011
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. Figa 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.
Starting Page	529
Ending Page	535
Page Count	7
File Format	PDF
ISSN	00263672
Journal	Microchimica Acta
Volume Number	173
Issue Number	3-4
e-ISSN	14365073
Language	English
Publisher	Springer Vienna
Publisher Date	2011-03-30
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gold nanoparticles Phosphododecamolybdate Photoreduction technique Modified electrode Electrocatalytic reduction Nanochemistry Analytical Chemistry Characterization and Evaluation of Materials Microengineering Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry

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