Ishihara Ryo, Makino Yoshihiro, Yamaguchi Yuki, Fujimoto Kenjiro, Nishio Keishi
Department of Materials Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika, Tokyo 125-8585, Japan.
Department of Pure and Applied Chemistry, Tokyo University of Science, Noda 278-8510, Japan.
Membranes (Basel). 2022 Mar 2;12(3):291. doi: 10.3390/membranes12030291.
Hydrogen gas is a promising, clean, and highly efficient energy source. However, to use combustible H gas safety, high-performance and safe gas leakage sensors are required. In this study, transparent and flexible platinum-catalyst-loaded tungsten trioxide (Pt/WO) nanoparticle-dispersed membranes were prepared as H gas leakage sensors. The nanoparticle-dispersed membrane with a Pt:W compositional ratio of 1:13 was transparent and exhibited a sufficient color change in response to H gas. The membrane containing 0.75 wt.% of Pt/WO nanoparticles exhibited high transparency over a wide wavelength range and the largest transmittance change in response to H gas among the others. The heat treatment of the particles at 573 K provided sufficient crystallinity and an accessible area for a gasochromic reaction, resulting in a rapid and sensitive response to the presence of H gas. The lower limit of detection of the optimized Pt/WO nanoparticle-dispersed membrane by naked eye was 0.4%, which was one-tenth of the minimum explosive concentration. This novel membrane was transparent as well as flexible and exhibited a clear and rapid color response to H. Therefore, it is an ideal candidate sensor for the safe and easy detection of H gas leakage.
氢气是一种很有前景的清洁且高效的能源。然而，为了安全地使用可燃氢气，需要高性能且安全的气体泄漏传感器。在本研究中，制备了透明且柔性的负载铂催化剂的三氧化钨（Pt/WO）纳米颗粒分散膜作为氢气泄漏传感器。铂与钨组成比为1:13的纳米颗粒分散膜是透明的，并且对氢气有足够的颜色变化响应。含有0.75 wt.%的Pt/WO纳米颗粒的膜在宽波长范围内具有高透明度，并且在其他膜中对氢气的最大透光率变化最大。在573 K下对颗粒进行热处理可提供足够的结晶度和用于气致变色反应的可及面积，从而对氢气的存在产生快速且灵敏的响应。通过肉眼检测优化后的Pt/WO纳米颗粒分散膜的检测下限为0.4%，这是最低爆炸浓度的十分之一。这种新型膜既透明又柔性，并且对氢气表现出清晰且快速的颜色响应。因此，它是安全且易于检测氢气泄漏的理想候选传感器。
