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We report on a one-step hydrothermal growth of one-dimensional (1D) WO 3 nanostructures, using urea as 1D growth-directing agent and a precursor free of metals other than tungsten. By decreasing the pH of the starting solution, the size of the nanostructures was reduced significantly, this development being accompanied by the realization of phase pure hexagonal WO 3 nanorods (elimination...
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