Abstract Vanadium dioxide (VO2) is a remarkable thermochromic material for application in adaptive infrared camouflage due to the reversible phase transition that is coupled with an abrupt change in infrared optical properties. However, the relatively high phase transition temperature and the unclear infrared optical modulation characteristics in the mid-infrared and far-infrared regions largely restrict its practical applications. Here, W-doped VO2 nanoparticles were successfully prepared to reduce the transition temperature. When the effective doping amount of W was 1.70%, the transition temperature decreased to 43.2 °C. Importantly, the infrared properties of W-doped VO2 nanoparticles were studied in both MWIR (3–5 μm) and LWIR (8–14 μm) thermal atmospheric windows, for the first time, which exhibited significant infrared optical changes, with emissivity variation of Δe = 0.17 and Δe = 0.28, respectively. These favorable results further promote the development of the adaptive camouflage.

中文翻译：

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掺钨 VO2(M) 纳米粒子在中波红外和长波红外区域的红外光调制特性

摘要 二氧化钒 (VO2) 是一种显着的热致变色材料，由于可逆相变与红外光学特性的突然变化相结合，因此可用于自适应红外伪装。然而，相对较高的相变温度和中红外区和远红外区的红外光调制特性不明确，极大地限制了其实际应用。在这里，成功制备了 W 掺杂的 VO2 纳米粒子以降低转变温度。当 W 的有效掺杂量为 1.70% 时，转变温度降至 43.2 °C。重要的是，首次在 MWIR（3-5 μm）和 LWIR（8-14 μm）热大气窗口中研究了 W 掺杂的 VO2 纳米粒子的红外特性，其表现出显着的红外光学变化，发射率变化分别为 Δe = 0.17 和 Δe = 0.28。这些有利的结果进一步促进了适应性伪装的发展。