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Effect of Gold Adsorption on the Conductive Properties of Cyclo-octasulfur Microcrystals

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The formation of gold crystallites on the surface of S8 promotes diffusion of electrons and determines the conductive properties of the shell-core nanosystems. Conducting probe atomic microscopy and four-probe resistance measurements confirmed that Au/S8 shell-core systems exhibit electrical conductivity on the micro- as well as on the nanoscale in contrast to non-covered S8 crystals, which are insulating. The conductivity of Au/S8 systems on the microscale was measured to be 10 ± 1 S · cm−1. In XPS measurements, a single peak at 163.6 eV was observed for bulk S8 whereas an additional peak corresponding to a binding energy of 161.4 eV appeared for S8 adsorbed on a Au substrate. This is interpreted to mean that a chemical reaction has taken place. A process which results in adsorption of uniform gold nanolayers on needle shaped or fibrous S8 crystallites is under investigation.


Document Type: Research Article


Publication date: 2007-12-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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