A mesoporous microsphere with excellent optical performance is built by silica (SiO₂) nanoparticles self-assembly technique. This optical device shows a sensitivity to the hydrogen gas (H₂) in surrounding environment. The Palladium (Pd) nanoparticles are selectively introduced to heighten the sensitivity. The fabrication of these sensors and their sensing mechanisms are introduced and discussed. According to the experimental results, whispering-gallery modes of pure SiO₂ sensor shift linearly at a rate of ~110 pm/% with an H₂ concentration between 0.15% and 45%. In comparison, the Pd-decorated sensor shows a much higher sensitivity of ~1.33 nm/% for trace-gas detection. Such sensors, as a kind of lab-on-fiber devices, are very advantageous for on-line monitoring of H₂ leakage.

通过二氧化硅（SiO ₂）纳米粒子自组装技术构建了具有优异光学性能的介孔微球。该光学器件对周围环境中的氢气（H ₂）表现出敏感性。选择性引入钯（Pd）纳米颗粒以提高灵敏度。介绍并讨论了这些传感器的制造及其传感机制。根据实验结果，纯SiO ₂传感器的回音壁模式以〜110 pm / ％的速率线性变化，H ₂浓度在0.15 ％到45 ％之间。相比之下，装饰Pd的传感器显示出更高的灵敏度，约为1.33 nm /％用于痕量气体检测。这种传感器作为一种光纤实验室设备，对于在线监测H ₂泄漏非常有利。