The reproducible synthesis of metal–semiconductor core–shell nanoparticles consisting of 15 nm gold colloids homogeneously coated with a 10 nm layer of SnO2 is reported (see Figure). The surface plasmon band is drastically red-shifted from 521 to 542 nm. These materials display a high electrical capacitance and slow discharge rates in solution, indicating potential applications as electro-optical switches, supercapacitors, and redox catalysts.
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Oldfield et al. (2000) studied this question.