Change in crystalline structure of W₁₈O₄₉ nanowires induced by X-ray irradiation and its effects on field emission
2018
Wu, Junqing | Wang, Bo | Yi, Futing | Deng, Shaozhi | Xu, Ningsheng | Chen, Jun
W₁₈O₄₉ nanowires were synthesized by thermal evaporation, and the effects of X-ray irradiation on their crystalline structure, chemical composition, and field emission properties were systematically investigated. High-energy X-ray irradiation created nanoprotrusions on the surface of W₁₈O₄₉ nanowires and introduced crystalline slipping in the lattice. X-ray photoelectron spectroscopy results showed that the content of lattice oxygen increased and nitrogen was incorporated into the W₁₈O₄₉ nanowires after X-ray irradiation. Nevertheless, a stable and high current emission still could be obtained from the W₁₈O₄₉ nanowires after X-ray irradiation, with a slight increase in the threshold field from 6.4 to 7.9 MV m⁻¹. The mechanism of the change in crystalline structure, chemical composition, and field emission performance of W₁₈O₄₉ nanowires induced by X-ray irradiation is discussed.
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