▎ 摘　　要

NOVELTY - Resistive chemical sensor comprises an insulating substrate at least two metal electrodes on the insulating substrate, one active layer located on the substrate and the electrodes, connecting the metallic electrodes, where the active layer has a thickness between 20 nm-100 mu m and is made up of particles with a size between 20-1000 nm agglomerated and nanostructured in nanodomains, where the nanodomains are non-oxidized graphene with some atomic layers, the graphene contains structural defects, and the defects are carbon vacancies in the structure of graphene with some atomic layers. USE - Resistive chemical sensor for use in to detect the presence of nitric oxide in a concentration of 25 ppb in air at a temperature of 15-35 degrees C (claimed). ADVANTAGE - The sensor reduces low detection limit of NO2 is detected at a concentration of 25 ppb in air at a temperature of 15-35 degrees C and reducing agent with a great impact on health and the environment, and easy low-cost industrial scaling. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a method for obtaining the resistive chemical sensor which involves grinding graphite flakes by a high-energy oscillating dry mechanical method, for a time of at least 80 minutes at a grinding speed between 1300-1700 rpm, and at a temperature of 15-35 degrees C, dispersing the powder in an organic solvent selected from 1-methyl-2-pyrrolidinone, dimethylformamide or dimethylsulfoxide, where the nitrogen dioxide concentration range varies between 0.1-10 mg/ml, drip depositing the solution obtained on an integrating circuit comprising an insulating substrate with at least two metal electrodes on the substrate and evaporating the solvent in the air, optionally, and during drip-depositing the resistance between the electrodes is measured; and (2) a method for detecting the presence of nitrogen dioxide in air, which involves circulating reference air, without nitrogen dioxide, with a flow of 25-1000 mL/minutes, established by a flow controller, through a chamber, where the sensor is located, during at a time of 10-30 minutes for the sensor resistance to have a stable initial value, exposing the sensor of air to detect the presence of NO2 until at least the value of the response of the sensor is three times its noise, for a maximum time of 30 minutes, and purging the chamber of the air found inside for a period of between 10-30 minutes, optionally the sensor is exposed to ultraviolet radiation between 200-400 nm, preferably between 250-270 nm.