Kefer Stefan, Dai Jixiang, Yang Minghong, Schmauss Bernhard, Hellmann Ralf
Opt Lett. 2020 Jul 1;45(13):3601-3604. doi: 10.1364/OL.395341.
This Letter demonstrates a novel, to the best of our knowledge, hydrogen sensor based on a polymer planar Bragg grating coated with Pt-loaded -. The reflected Bragg signal shows a distinct peak splitting correlated to substrate anisotropies originating from the injection molding process. Especially at low concentrations, both sensing peaks exhibit an outstanding response to the heat generated by the exothermic reaction between hydrogen molecules and coating. Thereby, a hydrogen volume ratio of 50 ppm leads to a Bragg wavelength shift of -37, which yields an outstandingly low detection limit of only 5 ppm in air. Thus, functionalized polymer planar Bragg gratings are eminently suitable for leak detection applications.
据我们所知，这封信展示了一种基于涂有负载铂的聚合物平面布拉格光栅的新型氢传感器。反射的布拉格信号显示出与注塑工艺产生的基底各向异性相关的明显峰值分裂。特别是在低浓度下，两个传感峰对氢分子与涂层之间放热反应产生的热量都表现出出色的响应。因此，50 ppm的氢气体积比会导致布拉格波长偏移-37，这在空气中产生了仅5 ppm的极低检测限。因此，功能化的聚合物平面布拉格光栅非常适合用于泄漏检测应用。
