Solvothermal Synthesis of α-Fe2O3 Porous Nanobelts and Their Enhanced Acetone-sensing Properties

Porous α-FeOnanobelts have been prepared via a solvothermal route and subsequent calcination. The as-prepared nanostructure was characterized by XRD, FESEM, TEM, Nadsorption-desorption isotherms, etc. The α-FeOnanobelts presented obvious porous structures with the length of ca. 1～2 μm, width of ca. 200～350 nm and thickness of ca. 30～60 nm. It was found that the assistance of inorganic additives played an important role in the shape control of α-FeOnanostructure. The gas-sensing performance of the fabricated sensor based on α-FeOnanobelts sample was also investigated, and the response towards 1000 ppm acetone can reach 24.4. In addition, the gas-sensing conductive mechanism of the sensor was also proposed.