(3-Aminopropyl) triethoxysilane-based immobilization of Pt/WO3 on a microfiber sensor for high sensitivity hydrogen sensing

Qiao Gao, Bin Liu*, Yingying Hu, Juan Liu, Shengpeng Wan, Tao Wu, Xing-Dao He, Ping Lu, Jinhui Yuan, Renli Ma, Fary Ghassemlooy, Gerald Farrell, Qiang Wu*

*Corresponding author for this work

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A novel high stability hydrogen sensor based on a Pt/WO3 coated single-mode tapered-no-core single-mode (STNCS) fiber interferometer is proposed and experimentally studied. The STNCS structure is treated by (3-Aminopropyl) triethoxysilane (APTES) and then coated with Pt/WO3 nanorods. Compared to the traditional method of using poly (dimethylsiloxane) (PDMS) to adhere Pt/WO3 nanorods on the fiber surface, the APTES modified fiber forms strong covalent bonds with Pt/WO3 with stronger adhesion to the fiber surface, resulting in improved long-term stability. Experimental results show that the sensitivity of the sensor varies from -31.05 nm/% to -4.30 nm/% as the hydrogen concentration increases from 0 to 1.04%. The sensor also demonstrates good reproducibility, longer term stability and repeatability.
Original languageEnglish
Article number134268
Number of pages8
JournalSensors and Actuators B: Chemical
Early online date7 Jul 2023
Publication statusPublished - 15 Oct 2023

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