Lin Ting-Han, Chang Yin-Hsuan, Hsieh Ting-Hung, Huang Yu-Ching, Wu Ming-Chung
Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
Department of Materials Engineering, Ming-Chi University of Technology, New Taipei City 24301, Taiwan.
Polymers (Basel). 2023 Nov 3;15(21):4318. doi: 10.3390/polym15214318.
Volatile organic compounds (VOCs), often invisible but potentially harmful, are prevalent in industrial and laboratory settings, posing health risks. Detecting VOCs in real-time with high sensitivity and low detection limits is crucial for human health and safety. The optical sensor, utilizing the gasochromic properties of sensing materials, offers a promising way of achieving rapid responses in ambient environments. In this study, we investigated the heterostructure of SnO/WO nanoparticles and employed it as the primary detection component. Using the electrospinning technique, we fabricated a sensing fiber containing Ag NPs, poly(methyl methacrylate) (PMMA), and SnO/WO (PMMA-Ag-SnO/WO) for acetone vapor detection. Following activation via UV/ozone treatment, we observed charge migration between WO and SnO, resulting in a substantial generation of superoxide radicals on SnO nanoparticles. This phenomenon facilitates structural deformation of the fiber and alters the oxidation state of tungsten ions, ultimately leading to a significant change in extinction when exposed to acetone vapor. As a result, PMMA-Ag-SnO/WO fiber achieves a detection limit of 100 ppm and a response time of 1.0 min for acetone detection. These findings represent an advancement in the development of sensitive and selective VOC sensing devices.
挥发性有机化合物（VOCs）通常肉眼不可见但可能有害，在工业和实验室环境中普遍存在，会带来健康风险。以高灵敏度和低检测限实时检测VOCs对人类健康和安全至关重要。利用传感材料的气致变色特性的光学传感器为在环境中实现快速响应提供了一种有前景的方法。在本研究中，我们研究了SnO/WO纳米颗粒的异质结构，并将其用作主要检测组件。我们采用静电纺丝技术制备了一种包含银纳米颗粒、聚甲基丙烯酸甲酯（PMMA）和SnO/WO（PMMA-Ag-SnO/WO）的传感纤维用于丙酮蒸气检测。经过紫外/臭氧处理激活后，我们观察到WO和SnO之间的电荷迁移，导致SnO纳米颗粒上大量产生超氧自由基。这种现象促进了纤维的结构变形并改变了钨离子的氧化态，最终导致在暴露于丙酮蒸气时消光发生显著变化。结果，PMMA-Ag-SnO/WO纤维对丙酮检测的检测限达到100 ppm，响应时间为1.0分钟。这些发现代表了灵敏且选择性的VOC传感装置开发方面的一项进展。
