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Conference information: Abstracts, 15th Iranian Chemistry Congress

Abstract: Polymeric chemiresistor are a class of chemical sensor that has promise for being practical in situ sensor of volatile organic compound. (VOC) in various environmental monitoring Chemiresistors are manufactured by dissolving a chemically sensitive polymer in an appropriate solvent and mixing the dissolve polymer with conductive carbon particle. The resulting ink is then deposed and dried onto thin film (1). When exposed to various gases, the polymer within the composite film sorbs the vapor and swells reversibility. This swelling can change the distance between the conductive carbon Particles and thus induces a resistance change in the composite film which can be measured (2). Molecular imprinting is a technique to introduce molecular recognition sites for a specific analyte in a synthetic polymer for selective separation or concentration of target molecules (3). First, we synthesized the nano-sized imprinted polymer for ethanol in presence of MAA as a monomer and DVB as a cross linker and AIBN as an initiator. The applied chemiresistor ink was a mixture of a known concentration of polymeric adhesive, carbon nanotube, MIP particles and organic solvent. A little amount of the described ink was deposed between the electrodes and waited to dry. In order to test the sensor, a known concentration of ethanol was added in the designed sampling system. It was observed that the sorption of the target gas in the composite layer, deposited between the electrodes, increased considerably the sensor resistance. This event can be attributed to the swelling of the MIP particles as a result of ethanol adsorption on the MIP of the deposited layer. The inclusion of ethanol molecules in the selective cavities of the MIP leads to a noticeable swelling in the MIP particles, located among the carbon nanotubes. This phenomenon increases the distance among the conductive elements of the device and thus decrease the electron mobility through the MIP/nano tube composites. This sensor showed an interesting selectivity to ethanol
Template and target information: ethanol