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Synthesis, Characterization, and Assembly of -In2S3 Nanoparticles

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Semiconductor nanoparticles of Indium Sulphide were synthesized by a hydrothermal method using InCl3 and Na2S. Powder X-ray Diffraction analysis confirmed that the product obtained was nanocrystals of single-phase -In2S3. The crystallite size distribution was obtained from the diffraction profile and the average size was ∼5 nm. The compositional analyses performed on the as prepared powder showed that the material was devoid of any impurity with an In:S ratio very close to 2:3. A colloid of very fine In2S3 particles was obtained from the as-prepared powder by suspending them in acetonitrile. The optical absorption of this colloid showed evidence of strong quantum confinement of excitons and as a result the particles yielded intense photoluminescence in the violet-blue region. These colloidal particles were then electrophoretically driven on to a transparent conducting substrate to assemble into a nanostructure. A Grazing Incidence X-ray Diffraction analysis of the deposited layer revealed that the preferred orientation noticed in the native powder was removed in the deposit. The surface morphology of the deposit studied using SEM and AFM displayed an inherent ordering behaviour in the clusters organized into a two-dimensional film. The locus of the cluster lines tend to form closed circles, at the nanoscopic as well as microscopic scales, indicative of certain strong neighborhood correlations. Such structures may be expected to exhibit novel correlated properties also.


Document Type: Research Article


Publication date: June 1, 2007

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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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