▎ 摘　　要

NOVELTY - A nitrogen dioxide sensor based on blocking effect of composite material comprises a sensitive device on which a gas sensitive layer is arranged. The gas sensitive layer comprises a composite material with blocking effect. The blocking effect is that gas molecules are adsorbed on the surface of the sensitive material through non-covalent bonds, blocking ion conduction, causing the sensor resistance to increase. The composite material is a high-molecular polymer inorganic conductive material comprising a high-molecular polymer comprising gamma -polyglutamic acid, and containing amino, carboxyl, amide bond or hydroxyl functional groups, and an inorganic conductive material. The high-molecular polymer passes through the gas molecules form non-covalent bonds for dynamic adsorption/desorption. The inorganic conductive material comprises MXene materials, and containing a carbon-based material containing a three-dimensional support structure (I). USE - Nitrogen dioxide sensor based on blocking effect of composite material. ADVANTAGE - The nitrogen dioxide sensor has large response, rapid response/recovery speed, excellent recovery, good repeatability, can work at room temperature, without the help of illumination or heating additives, and low power consumption device development. DETAILED DESCRIPTION - A nitrogen dioxide sensor based on blocking effect of composite material comprises a sensitive device on which a gas sensitive layer is arranged. The gas sensitive layer comprises a composite material with blocking effect. The blocking effect is that gas molecules are adsorbed on the surface of the sensitive material through non-covalent bonds, blocking ion conduction, causing the sensor resistance to increase. The composite material is a high-molecular polymer inorganic conductive material comprising a high-molecular polymer comprising gamma -polyglutamic acid, and containing amino, carboxyl, amide bond or hydroxyl functional groups, and an inorganic conductive material. The high-molecular polymer passes through the gas molecules form non-covalent bonds for dynamic adsorption/desorption. The inorganic conductive material comprises MXene materials, and containing a carbon-based material containing a three-dimensional support structure of formula: Mn+1XnTx (I), where n is 1-3, M is transition metal, X is carbon and/or nitrogen, and Tx is a terminal functional group. An INDEPENDENT CLAIM is included for preparation of the nitrogen dioxide sensor based on blocking effect of composite material.