CHEMIRESISTIVE HUMIDITY SENSOR BASED ON COMPOSITE MATRICES CONTAINING HYDROPHILIC CARBON NANOHORNS

摘要

The invention relates to a humidity sensor based on hydrophilic carbonic nanohorns meant to be used for air humidity control in closed spaces, in paper and textile industry, in medical or pharmaceutical field, in wood processing industry, as well as in agriculture, meteorology and the like. According to the invention, the sensor consists of a dielectric substrate made of Lexan, having a thickness in the range of 40 μm...4 mm, on which electrodes are made by direct printing, cathode sputtering or evaporation, where the electrodes may be made of the same material, such as aluminium, chrome, copper or gold or of different materials, and they may have a linear shape or interdigitated configuration, after which, over the Lexan substrate with the electrodes, a binary composition consisting of agarose and hydrophilic carbon nanohorns is deposited from aqueous solution, using spin coating or drop casting methods, the mass percentage thereof in the sensitive layer varying between 0.1...1%