Fabrication of Ethanol Vapor Sensor Based on BaTiO3/ZnO Heterostructure
Paper ID : 1326-ICNS
Mohsen Taheripour *1, Shirin Nasresfahani2, Navid Yasrebi1, Mohammad Hossein Sheikhi3
1Department of Communication and Electronics, School of Electrical and Computer Engineering, Shiraz University, Shiraz, Iran
2Department of Electrical Engineering, Golpayegan University of Technology, Golpayegan, Iran
3School of Electrical and Computer Engineering, Shiraz University, Shiraz, Iran
Barium titanate/Zinc oxide heterostructure is proposed as an ethanol gas sensor. The nanostructure was synthesized by the combination of sol-gel and hydrothermal methods, and drop cast on gold interdigitated electrodes to fabricate the gas sensor. The structural properties and surface morphology of the sample were analyzed using X-Ray diffraction and scanning electron microscopy methods, verifying the successful formation of barium titanate and zinc oxide nanoparticles, in tetragonal and hexagonal form, respectively. The sensing properties of the nanostructure were investigated for ethanol concentrations between 50 ppm and 8000 ppm (our test equipment limits). It was shown that the fabricated sensor presents high sensitivity, and short response and recovery times (3s, and 9s, respectively) at the optimal operating temperature of 350 oC. The rather high value of the sensor response at 50 ppm (Ra/Rg = 5.5) and lack of saturation at 8000 ppm promotes the fabricated sensor to have the capability of detecting ethanol concentrations below 50, and above 8000 ppm.
Barium titanate; Ethanol sensing; Zinc oxide; Heterojunction.
Status : Abstract Accepted (Poster Presentation)