Cu2O template-assisted synthesis of porous In2O3 hollow spheres with fast response towards acetone

Abstract Metal oxide semiconductors with hollow structure and morphology have attracted considerable attention because of their promising application as gas sensors. Based on Pearson׳s hard and soft acid–base (HSAB) principle, we have successfully prepared porous In 2 O 3 hollow spheres by a template-assisted method using Cu 2 O as the sacrificial template. In(OH) 3 hollow spheres as the precursor were prepared via simple chemical reactions, then In 2 O 3 hollow spheres can be obtained by thermal decomposition of the precursor. The composition and morphologies of Cu 2 O templates and In 2 O 3 products were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). The results suggest that the final products were pure In 2 O 3 with the structure of hollow spheres, and the thickness of the spherical shell is about 15 nm. Finally, the gas sensor performance testing of In 2 O 3 hollow spheres showed the excellent properties of rapid response towards acetone gas.

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