Zhao Jiang, Cai Xiaolu, Zhang Xiaojing, Zhang Jiaojiao, Fan Jing, Ma Feng, Zhu Wei, Jia Xiyu, Wang Shushan, Meng Zihui
School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
ACS Appl Mater Interfaces. 2023 Sep 6;15(35):42046-42055. doi: 10.1021/acsami.3c06443. Epub 2023 Aug 25.
Nowadays, the sensing of hazardous gases is urgent for the consideration of public safety and human health, especially in extreme conditions of low temperatures. In this study, a photonic crystals (PhCs) sensor with water retention and antifreezing properties was developed and applied to visual hazardous gases sensing at low temperature, passively. The sensor was prepared by dip-coating with poly(methyl methacrylate) (PMMA) colloidal microspheres followed by embedding in k-carrageenan/polyacrylamide-ethylene glycol (k-CA/PAM-EG) hydrogel. The sensor responded to hazardous gases, including ammonia, toluene, xylene, acetone, methanol, ethanol, and 1-propanol, with a change in the reflection wavelength and visible structural color. At room temperature, the reflection wavelength of the sensor blue-shifted 49 nm in ammonia, and the structural color changed from red to yellow. For low temperatures, the sensor showed great water retention and antifreezing properties even at -57 °C due to the double network. The sensor still had a great response to hazardous gases after freezing at -20 °C for 12 h and testing at 0 °C, and the obtained results were similar to those at room temperature. Based on this excellent stability and visual sensing at low temperature, the sensor demonstrates the potential for detection of hazardous vapors in extreme environments.
如今，出于对公共安全和人类健康的考虑，尤其是在低温等极端条件下，对有害气体的传感变得至关重要。在本研究中，开发了一种具有保水和防冻性能的光子晶体（PhCs）传感器，并将其应用于低温下对有害气体的被动视觉传感。该传感器通过用聚甲基丙烯酸甲酯（PMMA）胶体微球进行浸涂，然后嵌入κ-卡拉胶/聚丙烯酰胺-乙二醇（κ-CA/PAM-EG）水凝胶中来制备。该传感器对包括氨、甲苯、二甲苯、丙酮、甲醇、乙醇和1-丙醇在内的有害气体作出响应，反射波长和可见结构颜色发生变化。在室温下，传感器在氨中的反射波长蓝移了49 nm，结构颜色从红色变为黄色。对于低温环境，由于双网络结构，该传感器即使在-57°C时仍表现出良好的保水和防冻性能。在-20°C下冷冻12小时后并在0°C下测试，该传感器对有害气体仍有很大响应，获得的结果与室温下的结果相似。基于这种出色的稳定性和低温下的视觉传感能力，该传感器展示了在极端环境中检测有害蒸气的潜力。
