We demonstrate the chemochromic sensor, which is used to detect hydrogen leaks at room temperature. The structure of the sensor is fabricated via electrostatic spray deposition (ESD) of a solution of Pd and WO₃ nanoparticles. ESD enables the uniform distribution of Pd nanoparticles on WO₃, with droplets of sub-micron size being generated during the process. With 1% of hydrogen diluted in N₂, the optimized sensor shows a rapid color change at room temperature that can be recognized with the naked eye within 15 s. The sensor exhibits a deep blue color in the presence of hydrogen, and this change is quantified by a color difference value of 18.5 in 10 min. The developed sensor is reversible, implying that it can recover its original color when exposed to air, and its reversibility is maintained over 20 cycles. Moreover, the sensor exhibits long-term stability for 40 d. The sensor is also fabricated on adhesive tape, which enables it to demonstrate prompt color change at the hydrogen leakage site.

我们演示了化学变色传感器，该传感器用于检测室温下的氢气泄漏。传感器的结构是通过Pd和WO ₃纳米颗粒溶液的静电喷涂（ESD）制成的。ESD可使Pd纳米颗粒在WO ₃上均匀分布，在此过程中会产生亚微米大小的液滴。用1％的氢气稀释在N _2中，经过优化的传感器在室温下显示出快速的颜色变化，可以在15 s内用肉眼识别出来。传感器在氢的存在下呈现深蓝色，并且此变化通过10分钟内的色差值为18.5来量化。开发的传感器是可逆的，这意味着当暴露在空气中时它可以恢复其原始颜色，并且其可逆性在20个周期内得以保持。此外，该传感器具有40 d的长期稳定性。该传感器也被制造在胶带上，这使它能够显示出氢气泄漏现场迅速的颜色变化。