Study of Cerium Doped Polyaniline Composites for Resistive Type CO2 Gas Detection

Kailash NEMADE, Sandeep WAGULEY


Polyaniline (PANi) has been regarded as a good sensing material due to its advantages of gas sensing ability and optimum performance at room temperature. The thick films of chemically synthesized cerium (Ce) doped polyaniline (PANi) were prepared by screen-printing on a glass substrate. The 5 samples of Ce doped PANi were synthesized by varying CeCl3 concentration from 0.1 to 0.5 M in constant 1 M aniline monomer with ammonium persulfate as an oxidant at room temperature. The sensitivity of films was measured for different concentration of CO2 gas (injection) at room temperature. The film of the 0.1 M concentration shows the highest sensing response. The O2- ions may form weak bonds with free electrons in the conduction band. This may lead to formation of surface carbonates. This causes an increase in the resistance of the material in the presence of CO2 gas. The material (0.1 M) in powder form was characterized by FTIR analysis for the confirmation of polymerization of aniline.



Cerium, polyaniline, screen-printing technique, CO2 gas

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