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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Electrical, Optical, and Thermal Transport Properties of Oxygen-Deficient Amorphous WOx (2.5 < x < 3) Films
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Electrical, Optical, and Thermal Transport Properties of Oxygen-Deficient Amorphous WOx (2.5 < x < 3) Films

机译：缺氧无定形WOX（2.5

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摘要

Oxygen-deficient tungsten oxide (WOx) is known as an active material for various future applications such as smart displays, photocatalysts, Li-ion battery, and so on. WOx exhibits versatile properties depending on the valence state of W, which can vary from +6 to +4. Therefore, clarifying the relationship between x, the valence state of W ion, and the material properties of WOx is crucial for discovering more unique device applications. In case of crystalline WOx, since WOx has many different phases, the valence state of W cannot be modulated continuously from +6 to +4. On the other hand, there is no phase boundary in amorphous (a-) WOx, the valence state of W ion can be continuously modulated against x, and the effect of valence state of W on the material properties of WOx can be thoroughly examined. Here, we report the electrical, optical, and thermal properties of a-WOx films with several valence states of +6 (d(0)), +5 (d(1)), and +4 (d(2)) for x ranging from 2.511 to 2.982. Although the +6 dominant films were electrical insulators with optical transparency in the visible region, we found that both optical transmissivity and electrical resistivity decreased drastically with increase in the +5 concentrations, which also enhances the thermal conductivity because heat can be carried by additional conduction electrons. As the +4 state became dominant in the film, the resistivity slightly increased, whereas the low visible transmission was maintained. These results suggest that the redox of tungsten between +6 and +5 is attributed to all versatile properties of a-WOx, which would be of great use for developing unique devices in the future.
机译：氧缺氧氧化钨（WOX）被称为用于各种未来应用的活性材料，例如智能显示器，光催化剂，锂离子电池等。 WOX根据W的价状态表现出多功能性质，其可以从+6到+4变化。因此，阐明X之间的关系，W离子的价态，WOX的材料特性对于发现更独特的设备应用是至关重要的。在结晶WOX的情况下，由于WOX具有许多不同的相，因此W的价态不能从+6到+4连续调节。另一方面，无定形（A-）WOX中没有相位边界，可以对X连续调节W离子的价态，并且可以彻底地检查W的v o的材料特性的价值的效果。在这里，我们报告了A-WOX膜的电气，光学和热性质，其+6（d（0）），+ 5（d（1））和+4（d（2））的+ 6（d（0）），+ 4（d（2））） x从2.511到2.982的范围。虽然+6主体薄膜是可见区域中具有光学透明性的电绝缘体，但是，光学透射率和电阻率随着+5浓度的增加而急剧下降，这也增强了导热率，因为热量可以通过额外的传导来承载电子。随着+4状态在薄膜中显着，电阻率略微增加，而保持低可见的变速器。这些结果表明，+6和+5之间的钨氧化还原归因于A-Wox的所有通用性质，这对于在未来开发独特的设备将是很好的用途。

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