Fiber optic room temperature ethanol sensor based on ZnSnO3/TiO2 with UV radiation sensitization.

A fiber optic ethanol gas sensor with ZnSnO 3 hollow cube/nano-TiO 2 composite coating based on ultraviolet (UV) radiation sensitization was proposed, which can realize high sensitivity, high selectivity, and fast ethanol gas sensing at room temperature. The probe adopted a simple single-mode fiber (SMF)-multi-mode fiber-SMF structure. The ZnSnO 3 /TiO 2 gas-sensitive film was coated on the sensing area by dip-coating method. Experiment results show that the probe sensitized by UV radiation has a linear sensitivity of 3.85 pm/ppm for ethanol gas at 0–250 ppm, which is about 6.6 times more sensitive than the probe without UV radiation (0.582 pm/ppm). In addition, the probe with UV radiation has good time measurement stability, a fast response time (response time is about 20 s, recovery time is about 60 s), and excellent ethanol gas selectivity. This study proves that UV radiation is an effective method to increase the sensitivity of gas sensing. This is also the first application of ZnSnO 3 /TiO 2 composite material in fiber optic sensors. Combined with the advantages of fiber optic sensing, it shows anti-electromagnetic interference, micro size, high sensitivity, high selectivity, fast response, and remote sensing. • A Fiber optic room temperature ethanol sensor was proposed and fabricated. • The TiO2/ZnSnO3 composite material was firstly applied in fiber optic sensors. • Under the UV radiation, the probe behaves good stability, fast response, excellent selectivity. [ABSTRACT FROM AUTHOR]