Hierarchical nanorod-flowers indium oxide microspheres and their gas sensing properties

Abstract In this work, In 2 O 3 microspheres with hierarchical nanostructures were successfully synthesized by solvothermal method in the presence of oleic acid and urea. The as-synthesized samples were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The results indicate that the synthesized hierarchical In 2 O 3 consists of irregular nanorods. Moreover, the gas sensing properties of as-prepared In 2 O 3 hierarchical microspheres were investigated. It was found that the sensor based on such hierarchical nanostructures exhibited high response and good selectivity to NO 2 at 145 °C.