Zhang Qi, Wang Ruxiu, Lu Yamiao, Wu Yayun, Yuan Jinghe, Liu Jiguang
School of Materials Design & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, P. R. China.
CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
ACS Appl Mater Interfaces. 2021 Jan 27;13(3):4220-4229. doi: 10.1021/acsami.0c20817. Epub 2021 Jan 12.
Coloration efficiency and a fast response are important in developing materials for optical switching. A novel, highly efficient photochromic tungsten oxide@poly(-isopropylacrylamide) (PNIPAM) hybrid sphere is reported, whose colors can be rapidly converted between yellow and blue under different lights. The color change can be seen clearly even if the tungsten oxide content in the hybrid sphere is very low, exhibiting outstanding coloration efficiency of tungsten oxide. A photochromic mechanism is proposed in which the amide group in PNIPAM spheres participates in electron injection and the transition of valence states between W and W in the photochromic process. The interaction between tungsten oxide and PNIPAM plays a key role in enhancing the coloration efficiency of tungsten oxide and accelerating the switchable speed of color transformation, which is very useful in developing new photochromic materials. These hybrid spheres can be used in rewritable record displays and have wide potential applications in controlling energy transmittance in smart windows or in detecting UV light in optical sensors.
在开发用于光开关的材料时，着色效率和快速响应至关重要。本文报道了一种新型的、高效的光致变色氧化钨@聚（N-异丙基丙烯酰胺）（PNIPAM）杂化球，其颜色可在不同光照下在黄色和蓝色之间快速转换。即使杂化球中氧化钨的含量非常低，颜色变化也能清晰可见，显示出氧化钨出色的着色效率。提出了一种光致变色机制，其中PNIPAM球中的酰胺基团在光致变色过程中参与电子注入以及W和W之间的价态转变。氧化钨与PNIPAM之间的相互作用在提高氧化钨的着色效率和加速颜色转换的可切换速度方面起着关键作用，这对于开发新型光致变色材料非常有用。这些杂化球可用于可重写记录显示，在智能窗户中控制能量透过率或在光学传感器中检测紫外光方面具有广泛的潜在应用。
