Structure and conductivity of nanocomposites formed on evaporation of drops of silver nanoparticle dispersion
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Conductive properties of deposits formed on evaporation of drops of silver nanoparticle dispersions were investigated. Deposits comprised two ringlike structures formed along the perimeter of the evaporating drop with the width of the first one being on the order of a few tens of microns and the second one being several hundred microns. It was shown that only the outer ringlike deposit conducted current. Dependences of its conductivity on the precursor content and on the size and concentration of nanoparticles in the initial colloidal solution were investigated, which were found to be similar to the percolation transition. Regularities of the deposit formation and the charge transfer mechanisms were discussed under the assumption that the investigated ringlike deposit represented a metal-polymer composite.
Keywordsnanocomposites nanoparticles electrical conductivity percolation transition
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