Semiconductor metal oxide/carbon nanotube hybrids generally have superior properties to those of their individual constituents. In this work, high-quality TiO2 nanowires (NWs) and their hybrid with multiwalled carbon nanotubes (MWCNTs) were fabricated for use as effective low-temperature ethanol-gas sensors. TiO2 NWs with high quality were prepared by the hydrothermal method using TiO2 powders as a precursor, and hybrid materials were obtained by mixing TiO2 NWs with MWCNT (2 - 50 wt. percent in content) in an absolute isopropanol solution using an ultrasonic probe. The hybrid materials were then deposited onto Ptinterdigitated electrodes for gas-sensing characterizations. The as-fabricated sensors were heat treated at 500°C for 30 min to enhance the adhesion of materials onto the substrate and stabilize devices. Scanning electron microscopy and transmission electron microscopy were used to morphologically characterize the materials. The sensing properties of the sensors were investigated with different ethanol concentrations at different working temperatures. Results revealed that the combination of TiO2 NWs and MWCNTs as a hybrid material was effective for low-temperature ethanol-gas sensors.
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