Ethanol Vapour Sensing Based on TiO2 Coated Fiber Optic

TiO2 coated plastic optical fiber is developed for ethanol vapour detection. The detection based on intensity modulated evanescent wave fiber optic sensors. The cladding of POF fiber is etched by using acetone and distilled water. TiO2 solution is prepared by dissolved the TiO2 pellet powder in isopropanol and stir it by using ultrasonic homogenizer. The optical properties of TiO2 is characterized by using UV-Vis spectrophotometer. The performance of coated fiber under ethanol vapour concentration range from 1000 ppm to 5000 ppm is examined. The penetration depth, response of the sensor and the sensitivity of coated fiber is observed transiently. The penetration depth of the TiO2 coated fiber is 32.96 nm to 35.52 nm with sensitivity of 0.001 µW/% and slope linearity of 93.75 %.