期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 53, 期 32, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/ab89cc
关键词
fiber-optic sensing; Mach-Zehnder interference; titanium dioxide; graphene quantum dots; hydrogen sulfide
资金
- National Natural Science Foundation of China [51574054]
- Science and Technology Research Program of Guangzhou City [201804010395, 201904010399]
- Scientific and Technological Project of General Administration of Quality Supervision, Inspection and Quarantine of China [2017QK109]
- Postgraduate Research Innovation Project of CQUT [ycx20192078]
- Innovation Leader Project of Chongqing Science and Technology Bureau [CSTCCXLJRC201905]
A novel photonic crystal fiber (PCF) Mach-Zehnder interferometer (MZI) was proposed for detecting hydrogen sulfide (H2S) gas. Two single-mode fibers (SMFs), two multi-mode fibers (MMFs), and a PCF are sequentially fused to form a MZI with SMF-MMF-PCF-MMF-SMF structure. Titanium dioxide/amino-functionalized graphene quantum dots (TiO2/af-GQDs) composite is coated on the surface of the PCF as a sensing membrane. The fabricated sensing membrane is characterized by x-ray photoelectron spectroscopy, x-ray diffraction and scanning electron microscopy. Furthermore, the properties of the sensor are examined. The results show that a uniform TiO2/af-GQDs film with a thickness of 1 mu m is successfully coated on the surface of the PCF. The sensor has a sensitivity of 26.62 pm ppm(-1), showing good linearity and selectivity for H2S in the range of 0 similar to 55 ppm. The response time and recovery time are about 68 s and 77 s, respectively. The sensor has the advantages of low cost, small volume and simple structure, which is suitable for on-line monitoring of H2S.
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