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. 2016 May 16;6:25610. doi: 10.1038/srep25610

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(a) Scanning electron micrograph of WO₃ nanowires. Panels (b–e) display the corresponding products after sulfurization at 500 °C, 600 °C, 700 °C and 800 °C, respectively. (f) X-ray diffraction patterns of the corresponding products. Note: the reflection located around 24° corresponds to elemental sulfur on the surface of the WS₂.