Fabrication and Characterization of Titanium Dioxide (TiO2) Nanorods and Nanoflowers on Fluorine Doped Tin Oxide (FTO) for Ethanol Gas Sensor Application

Abstract

Titanium dioxide (TiO 2 ) is one of the metal oxide semiconductor materials. In this study, TiO 2 nanorods and nanoflowers were deposited using a hydrothermal method at constant temperature (150 o C) on top of fluorine doped tin oxide (FTO) substrate. The hydrothermal reaction times were varied to 8, 12, 16, 20 and 24 hours. The morphological and structural properties of the samples were characterized by using Electron Microscopy (FESEM) and X-ray Diffraction (XRD), respectively. The optimized samples of TiO 2 nanorods and nanoflowers were 8 and 16 hours respectively due to has the highest crystallinity among others since it recorded the lowest full width at half maximum (FWHM) values. During the gas sensing measurement, the samples were heated at 200 o C and exposed to ethanol vapor, then the current changes were recorded. From the result obtained, TiO 2 nanorods based ethanol gas sensor recorded the lowest value of sheet resistance because it provided a better electron flow on the device. Meanwhile, it also has the highest value of conductivity compared to TiO 2 nanoflowers based device.