Absorption and electrochromic modulation of near-infrared light: realized by tungsten suboxide.
Absorption and electrochromic modulation of near-infrared light: realized by tungsten suboxide.
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DOI：
10.1039/c5nr09147k
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发表时间：
2016-05
期刊：
影响因子：
6.7
通讯作者：
G. Li;Shouhao Zhang;Chongshen Guo;Shaoqin Liu
中科院分区：
文献类型：
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作者：
G. Li;Shouhao Zhang;Chongshen Guo;Shaoqin Liu
本研究以针状亚氧化钨W18O49纳米晶为光学活性物质，实现对近红外光的光学控制。在这方面，W18O49纳米晶体由于其独特的光学性能而被选中。粉末吸收结果表明，针状W18O49纳米晶在780-2500 nm的整个近红外区表现出较强的宽广的光吸收，因此具有W18O49纳米晶涂层的薄膜有利于并能够很好地屏蔽几乎所有的近红外辐射，同时透射光的大部分是可见光。为了使其更加可调，最终通过逐层策略将W18O49纳米晶体组装到ITO玻璃上，用于以后的电致变色研究。W18O49纳米晶电致变色薄膜具有高对比度、较快的开关响应、较高的着色效率(650 nm处150 cm(2)C(-1)和1300 nm处255 cm(2)C(-1))、较好的长期氧化还原开关稳定性(500次循环后可逆性达98%)和较宽的可见和红外电致变色光谱覆盖范围。
In the present study, needle-like tungsten suboxide W18O49 nanocrystals were fabricated as the optical active substance to realize the aim of optical control of near-infrared light. The W18O49 nanocrystals were selected in this regard due to their unique optical performance. As revealed by the powder absorption result, the needle-like W18O49 nanocrystals show strong and wide photoabsorption in the entire near infrared region of 780-2500 nm, from which thin films with the W18O49 nanocrystal coating thus benefits and can strongly shield off almost all near infrared irradiation, whereas transmitting the majority of visible light. To make it more tunable, the W18O49 nanocrystals were finally assembled onto an ITO glass via the layer-by-layer strategy for later electrochromic investigation. The nanostructured architectures of the W18O49 nanocrystal electrochromic films exhibit high contrast, faster switching response, higher coloration efficiencies (150 cm(2) C(-1) at 650 nm and 255 cm(2) C(-1) at 1300 nm), better long-term redox switching stability (reversibility of 98% after 500 cycles) and wide electrochromic spectrum coverage of both the visible and infrared regions.