Abstract
In this work, Ga2O3/Al2O3 composite materials were synthesized by a two-step method via hydrothermal and calcining processes. The microstructures and morphology of the as-obtained nanocomposite were characterized by various techniques. It is shown that Ga2O3 nanorods with 26–28 nm in length and 2.6–5 nm in width disperse well on the surface of mesoporous 2D Al2O3 nanosheets. The Ga2O3/Al2O3 composite was tested to exhibit p-type conductivity and shows significantly good NOx gas sensing performance. Its response to NOx from 100 ppm to 500 ppb falls between 58.2% and 6.5% at room temperature. The mechanism related to the n-p transition was investigated and proposed. Our results are expected to provide a new cut-in point to Ga2O3-based composite materials for gas sensing application.
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