CHEMIRESISTIVE ETHANOL SENSOR USING SENSITIVE LAYERS OF ZNO NANOCOMPOSITES/OXIDATED CARBON NANOHORNS

摘要

The invention relates to a process for preparing a chemiresistive ethanol sensor. According to the invention, the process comprises the two-stage synthesis of oxidated carbon nanohorns by treating the carbon nanohorns in air, at a temperature of 500°C, with a thermal gradient of 5°/min, followed by oxidation with HOfor 72 h, at the ambient temperature, sol synthesis from the precursor Zn(CHCOO)x2HO, in absolute ethanol as solvent and, as stabilizer, monoethanolamine or lactic acid and oxidated carbon nanohorns, in two stages, while magnetically stirring, to result in a solution of ZnO nanocomposite/oxidated carbon nanohorns to be deposited by spin coating on a dielectric glass substrate with linear or interdigitated electrodes, followed by densification, resulting in a chemiresistive sensor with quick response to variations of ethanol concentration, in a broad temperature range.