Abstract
Titanium dioxide (TiO2) nanoparticles were synthesized by sol-gel method and the influences of calcination temperature and pH level on the particle size, crystal structure and morphology of the TiO2 nanoparticles were investigated. X-ray diffraction patterns reveal that the anatase to rutile phase transition occurs at calcination temperature varying from 600°C to 800°C and the phase transformation temperature obviously decreases as the pH level of reaction solution decreases. Scanning electron microscopy images show that pH level and calcination temperature play an important role in controlling the particle size, crystal structure and morphology of the as-prepared TiO2 nanoparticles. The gas sensing properties of Ag-doped TiO2 nanoparticles were measured and the experimental results exhibit that the gas sensor based on Ag-doped TiO2 nanoparticle film has high sensitivity and fast response to ethanol.
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