Palladium/Polymer Nanocomposite Based Chemiresistive SO{sub}2 Sensor

摘要

We report a highly sensitive palladium/polymer nanocomposite based SO{sub}2 gas sensor. The palladium/polycarbonate (Pd/PC) nanocomposite was synthesized by utilizing two different techniques. The ex-situ method involved the homogenous mixing of pre-synthesized Pd nanoparticles with the PC matrix. The in-situ method on the other hand involved the synthesis of Pd nanoparticles in the presence of PC matrix. The semi-conducting behavior of the in situ Pd/PC nanocomposites and the chemical affinity of Pd nanoparticles towards the lewis acid gases were efficiently employed to develop the SO{sub}2 sensor. A chemiresistive technique was used in the detection of the SO{sub}2 gas molecules in which the change in the electrical resistance of the nanocomposite associated with the adsorption of SO{sub}2 molecules by the nanocomposite was measured.