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Nanocomposite metal oxide thin films exhibit assuring qualities in the fieldof gas sensors because of the collective opportunities provided by theheterointerface formation. In this work, we present the synthesis of nitrogendoped mesoporous In$_2$O$_3$-ZnO nano-composite thin films by simple wetchemical method using urea as the nitrogen precursor. SEM investigationsuggests formation of mesoporous nano-composite thin films, where theuniformity of surface pore distribution depends on the relative proportion ofIn$_2$O$_3$ and ZnO in the composites. HRTEM investigation suggest formation ofsharp interfaces between N-In$_2$O$_3$ and N-ZnO grains in the nano-compositethin films. The nano-composite thin films have been tested for their ethanolsensing performance over an extensive range of temperature, ethanol vaporconcentration and relative humidity. Nitrogen doped nano-composite thin filmwith equal proportion of In$_2$O$_3$ and ZnO exhibits excellent ethanol sensingperformance at a reasonable operating temperature (~94 % at 200 {\deg}C for 50ppm of ethanol), fast response time (~two seconds), stability over time,enhanced resilience against humidity and selectivity to ethanol over variousother volatile organic compounds.

Nitrogen doped In$_2$O$_3$-ZnO nanocomposite thin film based sensitive and selective ethanol sensor