期刊
OPTICS LETTERS
卷 45, 期 13, 页码 3601-3604出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.395341
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资金
- National Natural Science Foundation of China [61575151]
- Natural Science Foundation of Hubei Province [2018CFB551]
This Letter demonstrates a novel, to the best of our knowledge, hydrogen sensor based on a polymer planar Bragg grating coated with Pt-loaded WO3-SiO2. The reflected. Bragg signal shows a distinct peak splitting correlated. to substrate anisotropies originating from the injection molding process. Especially at low H-2 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 pm, which yields an outstandingly low detection limit of only 5 ppm H-2 in air. Thus, functionalized polymer planar Bragg gratings are eminently suitable for H-2 leak detection applications. (C) 2020 Optical Society of America
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