Abstract
The effect of different calcining temperatures on the lattice constants of the metal oxide semiconductor Nb 2O 5 was investigated using powder X-ray diffraction technology. It was shown that the crystal structure, lattice constants and crystallite size were changed with the different calcining temperatures. The electrical resistance and the gas-sensing properties of the gas sensor based on Nb 2O 5 for petrol, i-C 4H 10, H 2 and C 2H 5OH gases were different at the different calcining temperatures. The Nb 2O 5 gas sensor exhibited good sensitivity and selectivity for petrol after calcining at 1000°C.
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