She Xiaoyi, Shen Yang, Wang Jianfang, Jin Chongjun
1State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275 China.
2School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou, 510275 China.
Light Sci Appl. 2019 Jan 9;8:4. doi: 10.1038/s41377-018-0114-x. eCollection 2019.
For the rapid development of the hydrogen economy, a reliable and low-cost hydrogen sensor appears to be extremely important. Here, we first show that a palladium film deposited on polydimethylsiloxane (PDMS) can obtain an exceedingly high-reflectance contrast of 25.78 over the entire visible band upon exposure to 4 vol% hydrogen gas (H) mixed with nitrogen gas. This high-reflectance contrast results from the surface deformation induced by the volume inflation after exposure to H, leading to the transition of the near-specular surface to a diffusing surface. In addition, a change in brightness is readable by naked eye upon exposure to H with various concentrations from 0.6 to 1 vol% under the illumination of a fluorescent tube. Furthermore, this sensor possesses an excellent recyclability and quick response time of a few seconds. Compared with Pd nanostructure-based hydrogen sensors, this visual, high-contrast and low-cost sensor is of great potential for practical hydrogen sensing.
对于氢经济的快速发展而言，一种可靠且低成本的氢传感器显得极为重要。在此，我们首次表明，沉积在聚二甲基硅氧烷（PDMS）上的钯膜在暴露于与氮气混合的4体积%氢气（H₂）时，在整个可见波段可获得高达25.78的极高反射率对比度。这种高反射率对比度是由暴露于氢气后体积膨胀引起的表面变形导致的，使得近镜面表面转变为漫反射表面。此外，在荧光灯管照明下，当暴露于浓度从0.6到1体积%的不同氢气浓度时，肉眼可读出亮度变化。再者，该传感器具有出色的可回收性和几秒的快速响应时间。与基于钯纳米结构的氢传感器相比，这种可视化、高对比度且低成本的传感器在实际氢传感方面具有巨大潜力。
