| Summary: | By controlling the hydrothermal time, porous In<sub>2</sub>O<sub>3</sub> nanosheet-assembled micro-flowers were successfully synthesized by a one-step method. The crystal structure, microstructure, and internal structure of the prepared samples were represented by an x-ray structure diffractometry, scanning electron microscopy, and transmission electron microscopy, respectively. The characterization results showed that when the hydrothermal time was 8 h, the In<sub>2</sub>O<sub>3</sub> nano materials presented a flower-like structure assembled by In<sub>2</sub>O<sub>3</sub> porous nanosheets. After successfully preparing the In<sub>2</sub>O<sub>3</sub> gas sensor, the gas sensing was fully studied. The results show that the In<sub>2</sub>O<sub>3</sub> gas sensor had an excellent gas sensing response to ethanol, and the material prepared under 8 h hydrothermal conditions had the best gas sensing property. At the optimum working temperature of 270 °C, the highest response value could reach 66, with a response time of 12.4 s and recovery time of 10.4 s, respectively. In addition, the prepared In<sub>2</sub>O<sub>3</sub> gas sensor had a wide detection range for ethanol concentration, and still had obvious response for 500 ppb ethanol. Furthermore, the gas sensing mechanism of In<sub>2</sub>O<sub>3</sub> micro-flowers was also studied in detail.
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