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Dual Response of Photonic Films with Chiral Nematic Cellulose Nanocrystals: Humidity and Formaldehyde
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-03 , DOI: 10.1021/acsami.0c00591 Guomin Zhao 1, 2 , Yin Zhang 1 , Shengcheng Zhai 1 , Junji Sugiyama 3 , Mingzhu Pan 1, 2 , Jingbo Shi 1 , Hongyi Lu 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-03 , DOI: 10.1021/acsami.0c00591 Guomin Zhao 1, 2 , Yin Zhang 1 , Shengcheng Zhai 1 , Junji Sugiyama 3 , Mingzhu Pan 1, 2 , Jingbo Shi 1 , Hongyi Lu 1
Affiliation
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Manipulating functional stimuli-responsive materials has been a hot topic in the research of smart sensors and anticounterfeiting encryption. Here, a novel functional chiral nematic cellulose nanocrystal (CNC) film showing dual responsiveness to humidity and formaldehyde gas was fabricated. The chiral nematic CNC iridescent film could respond to environmental humidity and formaldehyde gas changes by reversible motion. Interestingly, the humidity sensitivity of the CNC iridescent film could be gated by exposing the film to formaldehyde gas. At the same time, the formaldehyde-responsive behavior is strongly affected by the relative humidity (RH), and the response range could be tuned by changing the RH over a wide range. Importantly, the formaldehyde-induced color change could be altered from invisible to visible by the naked eye when the film was exposed to a humid environment. The mechanism of this dual response of the CNC iridescent film is ascribed to the synergistic effect of cooperation and competition between water and formaldehyde molecules by constructing physical cross-linking networks by hydrogen bonds among water, formaldehyde, and CNCs. Furthermore, the “RH-concentration of formaldehyde gas-color” ternary colorimetric system was simulated, which is thought to endow the CNC iridescent film with great potential to act as a sensor in the convenient visible detection of gaseous formaldehyde. Furthermore, this work provided a promising strategy to design multi-gas-sensitive devices with convenient detection, good stability, and excellent reversibility.
中文翻译：
手性向列纤维素纳米晶体的光子膜的双重响应：湿度和甲醛。
操纵功能性刺激响应材料一直是智能传感器和防伪加密研究的热点。在这里，新型的功能性手性向列型纤维素纳米晶体（CNC）膜显示出对湿度和甲醛气体的双重响应。手性向列型CNC虹彩膜可通过可逆运动响应环境湿度和甲醛气体的变化。有趣的是，CNC虹彩膜的湿度敏感性可以通过将膜暴露于甲醛气体中来控制。同时，相对湿度（RH）强烈影响甲醛的响应行为，可以通过在较大范围内改变RH来调整响应范围。重要的，当薄膜暴露在潮湿的环境中时，由甲醛引起的颜色变化可以由肉眼从不可见变为可见。CNC虹彩膜这种双重响应的机制归因于水和甲醛分子之间通过氢，水和甲醛与CNCs之间的氢键构建物理交联网络而产生的协作和竞争的协同效应。此外，模拟了“甲醛气相色谱的RH浓度”三元比色系统，该系统被认为赋予CNC虹彩膜很大的潜力，可作为可视化检测气态甲醛的传感器。此外，这项工作为设计具有方便检测，良好稳定性和可逆性的多气体敏感设备提供了一种有前途的策略。
更新日期：2020-04-03
中文翻译：
手性向列纤维素纳米晶体的光子膜的双重响应：湿度和甲醛。
操纵功能性刺激响应材料一直是智能传感器和防伪加密研究的热点。在这里，新型的功能性手性向列型纤维素纳米晶体（CNC）膜显示出对湿度和甲醛气体的双重响应。手性向列型CNC虹彩膜可通过可逆运动响应环境湿度和甲醛气体的变化。有趣的是，CNC虹彩膜的湿度敏感性可以通过将膜暴露于甲醛气体中来控制。同时，相对湿度（RH）强烈影响甲醛的响应行为，可以通过在较大范围内改变RH来调整响应范围。重要的，当薄膜暴露在潮湿的环境中时，由甲醛引起的颜色变化可以由肉眼从不可见变为可见。CNC虹彩膜这种双重响应的机制归因于水和甲醛分子之间通过氢，水和甲醛与CNCs之间的氢键构建物理交联网络而产生的协作和竞争的协同效应。此外，模拟了“甲醛气相色谱的RH浓度”三元比色系统，该系统被认为赋予CNC虹彩膜很大的潜力，可作为可视化检测气态甲醛的传感器。此外，这项工作为设计具有方便检测，良好稳定性和可逆性的多气体敏感设备提供了一种有前途的策略。
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