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On the way to advance the sensing technology, various strategies based on thenano-materials have been introduced to improve the performance of the gassensors. In this study, we have introduced a facile fabrication procedure forannealing hematite to monitor ethanol gas. Due to large specific area of thisconductive platform, more available target molecules (ethanol gas) aredetected. To construct this platform, initially, a large scale well-separatediron oxide (hematite) nanostructures are created via an annealing process. Themorphology of the nanostructure is optimized through annealing temperature andoperating temperature for ethanol gas. The best response for the gas sensor isachieved for hematite nanostructures fabricated through the annealingtemperature of 500{\deg}C and the operating temperature of 225$^\circ$C. Thefabricated nanostructures is tested in air ambient conditions for variousethanol gas concentrations from 50 to 1000 ppm. The modified sensor exhibitedacceptable reproducibility and good selectivity with no interference-effect. Toexamine the X-ray diffraction patterns of hematite nanostructures at threeannealed temperatures, the Rietveld method and FullProf software are used inwhich the average crystal size has been obtained. Obviously, with increasingthe annealing temperature, the average size of the crystals has been increased.The results of ultraviolet-visible spectroscopy show that the energy gapdecreased with increasing annealing temperature. The maximum sensing responseof hematite flower-like nanostructures is obtained at a concentration of 1000ppm. Also, the shortest response time is estimated at about 27 seconds forethanol at a concentration of 200 ppm. The detection limit of this sensor isobtained at 50 ppm.

High Sensitive $\alpha$-Fe$_2$O$_3$ Nano-structured Gas Sensor Fabricated through Annealing Technique for Detecting Ethanol