Other Major Issues

Following are the major issues associated with the sol-gel derived nanocrystalline SnO2 thin-film sensor, which need to be yet resolved: (i) very low stability of SnO2 nanocrystals during operation at elevated temperature, (ii) poor selectivity of the sol-gel derived nanocrystalline SnO2 thin-film sensor towards specific gas, and (iii) lower sensitivity and higher response and recovery time at lower operating temperatures, specifically at room temperature.

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