Abstract
Hollow In2O3 spheres were prepared via a P123-assisted one-step solvothermal process for the first time. Ethanol medium played a key role in the direct cubic In2O3 phase formation whereas the triblock copolymer acted as a structure directing agent in the formation of the hollow spheres. The gas sensing properties of the as-prepared In2O3 hollow spheres were investigated. Compared to the products synthesized without P123, the In2O3 hollow spheres exhibited much faster response and higher sensitivity toward HCHO vapor.
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