Abstract
Hollow and porous In2O3 nanospheres have been prepared by the hydrolysis ofInCl3 using carbonaceous spheres as templates in combination with calcination.Based on the observation of scanning electronic microscopy (SEM) andtransmission electron microscopy (TEM), it has been revealed that the as-preparedIn2O3 nanospheres have a uniform diameter of around 200 nm and hollow structures with thin shells of about30 nm consisting of numerous nanocrystals and nanopores. Owing to the hollow and porous structures,In2O3 nanospheres possessing more active surface area exhibit a good responseand reversibility to some organic gases such as methanol, alcohol, acetoneand ethyl ether. In addition, the response mechanism of hollow and porousIn2O3 nanospheres to organic gases has been proposed. Furthermore, these preparedIn2O3 spheres showed a UV–visible absorption peak centered at around 309 nm, and theirphotoluminescence spectra have also been investigated.
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