Mao Yongyun, Liu Zhihe, Liang Lanfeng, Zhou Yifei, Qiao Yuan, Mei Zhipeng, Zhou Bingpu, Tian Yanqing
Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau 999078, China.
Department of Materials Science and Engineering, Southern University of Science and Technology, No. 1088, Xueyuan Rd., Xili, Nanshan District, Shenzhen, Guangdong 518055, China.
ACS Omega. 2018 May 25;3(5):5669-5677. doi: 10.1021/acsomega.8b00115. eCollection 2018 May 31.
Sensitivity enhancement of optical oxygen sensors is crucial for the characterization of nearly anoxic systems and oxygen quantification in trace amounts. In this work, for the first time we presented the introduction of silver nanowires (AgNWs) as a sensitivity booster for optical oxygen sensors based on AgNWs-palladium octaethylporphine-poly(methyl methacrylate) (AgNWs@PdOEP-PMMA) microfiber mats prepared by electrospinning. Herein, a series of sensing microfiber mats with different loading ratios of high aspect ratio AgNWs were fabricated, and the corresponding sensitivity enhancement was systematically investigated. With increasing incorporated ratios, the AgNWs@PdOEP-PMMA-sensing microfiber mats exhibited a swift response (approx. 1.8 s) and a dramatic sensitivity enhancement (by 243% for the range of oxygen concentration 0-10% and 235% for the range of oxygen concentration 0-100%) when compared to the pure PdOEP-PMMA microfiber mat. Additionally, the as-prepared sensing films were experimentally confirmed to be highly photostable and reproducible. The advantages of AgNW-induced sensitivity enhancement could be useful for the rational design and realization of revolutionary highly sensitive sensors and expected to be readily applicable to many other high-performance gas sensor devices.
提高光学氧传感器的灵敏度对于近缺氧系统的表征和痕量氧的定量分析至关重要。在这项工作中，我们首次介绍了将银纳米线（AgNWs）作为基于通过静电纺丝制备的AgNWs-钯八乙基卟啉-聚甲基丙烯酸甲酯（AgNWs@PdOEP-PMMA）微纤维垫的光学氧传感器的灵敏度增强剂。在此，制备了一系列具有不同高纵横比AgNWs负载率的传感微纤维垫，并系统地研究了相应的灵敏度增强情况。与纯PdOEP-PMMA微纤维垫相比，随着掺入比例的增加，AgNWs@PdOEP-PMMA传感微纤维垫表现出快速响应（约1.8秒）和显著的灵敏度增强（在氧浓度0-10%范围内提高243%，在氧浓度0-100%范围内提高235%）。此外，实验证实所制备的传感膜具有高度的光稳定性和可重复性。AgNWs诱导的灵敏度增强的优点对于合理设计和实现革命性的高灵敏度传感器可能是有用的，并有望很容易地应用于许多其他高性能气体传感器装置。
