Abstract
Metal ions doping is a typical approach for tuning sensing properties of metal oxide semiconductors based gas sensors. Herein, hierarchical flower-like pure and In-doped Co3O4 nanostructures assembled by porous two-dimensional (2D) nanosheets are synthesized via a solvothermal method and annealing process. The sensing measurements display that the In@Co3O4-4 based sensor possesses high response value of 55.9 toward 100 ppm xylene at 150 °C, which is nearly 3.8 times larger than that of pure Co3O4 sensor. Furthermore, it possesses good selectivity and anti-humidity properties. Combined with the results of DFT calculations, the mechanism of enhanced gas sensing performance is analyzed systematically.
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