Abstract
Optical spectroscopy and atomic force microscopy are used to study the formation of silver shells on gold nanoparticles in their highly ordered two-dimensional ensembles produced by the method of block copolymer micellar lithography. The shells are synthesized using formaldehyde or hydroquinone as a reducing agent. The spectral characteristics of the nanoparticle ensemble are shown to be essentially sensitive to the silver shell thickness. As a result, working units of solid-state optical sensors for detecting trace amounts of metal ions and different reductants may be created based on highly ordered 2D ensembles of gold nanoparticles.
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