Abstract
A fiber-optic surface plasmon resonance (SPR) hydrogen sulfide (H2S) gas sensor is proposed and fabricated by using silver/triaminopropyltriethoxysilane/copper-multiwalled carbon nanotubes (Ag/APTES/Cu-MWCNT) as sensing film. A single-mode fiber (SMF) is spliced between two multimode fibers (MMF) to form an MMF-SMF-MMF sensing structure. The Ag/APTES/Cu-MWCNT sensing film is coated on the surface of SMF. The performance and stability of the sensor were investigated in detail. With the increase of H2S concentration in the range of 10–100 ppm, the redshift of the resonance dip reaches 126.465 nm, and the logarithm of H2S concentration and the resonance dip wavelength shift satisfy the linear relationship. In the range of 1–10 ppm, the wavelength shifts 117.421 nm, and H2S concentration and the dip wavelength shift meet a linear relationship. The sensitivity (12.9849 nm/ppm) is obtained, the detection limit (0.146 ± 0.031 ppm) is determined, and the response time is about 28 s. The sensor has excellent selectivity, good time, humidity and temperature stability, which has potential application in the field of trace H2S gas monitoring.
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