Constructing novel materials with a hierarchical structure has become an increasingly hot research topic, because the hierarchical structures have wide potential applications in the fields of bionics, electronics, photocatalysis, solar cells, and lithium ion batteries. In this paper, we report on the fabrication of rhombohedral corundum-type indium oxide (rh-In2O3) hierarchical rod-aggregates by annealing oxyhydroxide (InOOH) counterparts prepared through a simple solvothermal route without surfactant. The formation mechanism of the InOOH hierarchical structures is suggested. The rh-In2O3 hierarchical crystals were tested in the role of sensing ammonia gas, and were found to show an excellent gas-sensitivity to NH3 as compared to the cubic bixbyite-type indium oxide (c-In2O3) analogues.
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Jiang et al. (2013) studied this question.
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