Enhanced xylene sensing performance of hierarchical flower-like Co3O4 via In doping

Metal ions doping is a typical approach for tuning sensing properties of metal oxide semiconductors based gas sen-sors.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 ℃,which is nearly 3.8 times larger than that of pure Co3O4 sensor.Furthermore,it possesses good selectivity and anti-humidity properties.Com-bined with the results of DFT calculations,the mechanism of enhanced gas sensing performance is analyzed systematically.