Broad Absorption and Metallic KCu7–x S4 Nanowires Synthesized by Modified Composite-Hydroxide-Mediated Method
A novel single-crystalline KCu7–x S4 nanowires were synthesized by a modified composite hydroxide mediated approach. The synthesis conditions including water content, reaction time and medium were systematically investigated to get an optimal morphology. Scanning electron microscopy and transmission electron microscopy were used to characterize the morphologies of the samples which can be controlled by varying the synthesis conditions. The crystal structure of the sample was determined by X-ray diffraction and series surveys of diffraction spot configurations in the reciprocal space via transmission electron microscope which reveals that the synthesized sample is the body center tetragonal KCu7–x S4 with the cell parameter a = b = 10.163 Å, and c = 3.838 Å. A broad absorption in visible-infrared region was found. The resistivity of the film made from the KCu7–x S4nanowires is less than 5×10–5 Ω˙cm at room temperature and displays a metallicity below the temperature of 165 °C according to temperature dependent– resistance measurement.
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Document Type: Research Article
Publication date: September 1, 2013
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