| The emission of NOx gas increases sharply with the development of industry,and interferes with human production and life,the survival and reproduction of animals and plants.Hence,it is very necessary to design an effective gas sensor to detect NOx content in the air.Hollow tubular In2O3 was synthesized by MIL-68（In）,and In2O3/g-C3N4 binary complex and In2O3/g-C3N4/rGO ternary complex were synthesized.The research content of this paper is as follows:1.The hollow tubular In2O3 derived from MOF and sheet g-C3N4 were obtained by hydrothermal and calcining,and the samples were analyzed by XRD.It can be seen from the characterization results that In2O3/g-C3N4 is composed of hollow tubular In2O3and thin sheets g-C3N4.The response of In2O3/g-C3N4to 100 ppm NOx is 294.9,which is 15 times higher than that of In2O3 at room temperature.The In2O3/g-C3N4 composite showed good selectivity,high response value,wide test range and excellent long-term stability for NOx at room temperature.Compared with In2O3,the reasons for the improvement of gas sensitivity performance of binary composites are mainly related to the increase of mobile electrons and electron cloud density of In2O3/g-C3N4 by g-C3N4,the high chemical adsorption oxygen content and the increase of specific surface area.2.The In2O3/g-C3N4/rGO was synthesized by modifying rGO on the basis of In2O3/g-C3N4,and the morphology of the composite was characterized and the gas sensitivity performance was studied.The response of In2O3/g-C3N4/rGO to 100 ppm NOx is 2240,which is 7.6 times higher than that of In2O3/g-C3N4 at room temperature.Compared with the In2O3/g-C3N4,In2O3/g-C3N4/rGO showed higher response values and faster response/recovery speed.In2O3/g-C3N4/rGO further improve the gas sensitive property is related to the fast carrier transport of the ternary complex caused by the addition of rGO,forming new heterojunctions of rGO,g-C3N4 and In2O3 are,which further improves the adsorbed oxygen content. |
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