Abstract

Abstract In 2 O 3 hierarchical nanostructures were successfully synthesized by a simple calcination of InOOH precursor obtained with a hydrothermal method in the presence of sucrose 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 clearly revealed that the hierarchical nanostructure of In 2 O 3 was composed of aggregated nanosheets with pore size about 14 nm. Gas sensing properties of as-prepared In 2 O 3 hierarchical nanostructures were investigated. It was found that the sensor based on such novel nanostructures exhibited high response and good repeatability to NO 2 at room temperature.

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