Rare Metals ( IF 9.6 ) Pub Date : 2022-01-17 , DOI: 10.1007/s12598-021-01879-x Ming-Peng Huang 1 , Jin-Yong Hu 1 , Jia-Bei Liu 1 , Jian-Xu Ren 1 , Meng-Qi Yin 1 , Jue-Xian Cao 1, 2 , Yong Zhang 1, 2 , Qian-Wei Xiang 3
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Hydrochromic materials have attracted increasing attention due to the visual color change behaviors, but the disadvantage of slow color change and irreversibility are still serious obstacles to achieve practical application. Herein, the optimized NiI2/CF3(CF2)7I (the molar ratio is 100:1) prepared by organic hybridization is found to have reversible and fast color change behavior from black to transparent. After introducing the CF3(CF2)7I, the time of NiI2 film turned from transparent (visible-light absorbance: 0%) to black (visible-light absorbance: 80%) is reduced from 47 to 22 s. The rapid color change speed from transparent to black is mainly attributed to the introduction of hydrophobic groups in CF3(CF2)7I into the interior of NiI2 during organic hybridization, which improves the internal hydrophobic properties of NiI2. By means of the fast hydrochromic behavior and the obvious changes in visible-light transmittance under 30% RH, NiI2/CF3(CF2)7I humidity switch based on solar cell is developed without power supply. This work can provide an effective approach for improving the desorption behavior of water molecules for moisture-induced color change materials and a guideline for the development of fast and portable humidity sensors.
Graphical abstract
中文翻译：
有机杂化增强水致变色材料NiI2的解吸性能
水致变色材料由于视觉上的变色行为引起了越来越多的关注，但变色缓慢和不可逆的缺点仍然是实现实际应用的严重障碍。在此，发现通过有机杂化制备的优化的NiI 2 /CF 3 (CF 2 ) 7 I（摩尔比为100:1）具有可逆且快速的从黑色到透明的颜色变化行为。引入CF 3 (CF 2 ) 7 I 后，NiI 2的时间薄膜从透明（可见光吸收：0%）变为黑色（可见光吸收：80%）从 47 秒减少到 22 秒。颜色从透明到黑色的快速变化主要是由于有机杂化过程中CF 3 (CF 2 ) 7 I中的疏水基团引入NiI 2内部，提高了NiI 2的内部疏水性能。NiI 2 /CF 3 (CF 2 ) 7凭借快速的水致变色行为和可见光透射率在 30% RH 下的明显变化I 开发了基于太阳能电池的湿度开关，无需电源。这项工作可以为改善水分子对水分诱导变色材料的解吸行为提供有效的方法，并为开发快速便携的湿度传感器提供指导。
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