Synthesis and characterization of electrical conducting chitosan-graft-polyaniline

Abstract

Abstract.A mucopolysaccharide, chitosan was grafted with polyaniline through oxidative-radical copolymerization using ammonium persulfate in acidic medium. The grafting conditions were extensively studied by varying grafting parameters. All the findings have been discussed and proposed a plausible mechanism for the graft copolymerization. The representative chitosan-graft-polyaniline (Ch-g-PANI) was characterized using UV-vis, FTIR, TGA, X-ray diffraction and Scanning electron microscopy taking chitosan as reference. Ch-g-PANI exhibited electrical conductivity, which increases with the extent of grafting onto chitosan backbone. Its electrical conductivity is further influenced by pH and showed pH switching electrical conduction behavior when exposed to NN3/HCl vapors. The application of conducting biomaterial such as Ch-g-PANI in the electronic devices especially for the fabrication of sensor devices would be attractive not only in terms of product cost and environmental safety but also from a materials science point of view.

Chitosan-g-polyaniline: a creatine amidinohydrolase immobilization matrix for creatine biosensor

“…Graft copolymerization, enzyme immobilization and characterization In the electrochemical copolymerization synthesis, the aniline monomer initially became protonated with HCl and propagated to form an intermediate called PANI radical cation (Figure 2a) [17][18][19]. PANI radical cation simultaneously generated CHIT macro radicals (Figure 2b) by the abstraction of hydrogen from the -OH and -NH 2 groups of the CHIT macromolecules [15,16]. The PANI cation radicals and CHIT macro radicals then copolymerized and yielded CHIT-g-PANI (Figure 2c).…”

“…It is a hydrophilic material due to the presence of both amino and hydroxyl groups; however, CHIT is insoluble in water and aqueous basic media [15]. It was chosen as the orientation directing matrix because there are large quantities of amino and hydroxyl groups on the CHIT units, which have a strong binding ability to enzyme and DNA [14,16]. Moreover, in acidic condition CHIT showed a cationic nature that may provide an electrostatic core environment to zwitterion molecules such as enzyme.…”

Synthesis and application of solar cells of poly (3-decylthiophene)/N/titanium dioxide hybrid

“…Conducting polymers with highly-extended !-electron systems in their main chains have attracted much interest [1][2][3][4]. Polymers and metal oxides have been studied for many years for their independent electrical, optical, and mechanical properties [5].…”

Gum ghatti based novel electrically conductive biomaterials: A study of conductivity and surface morphology

“…Crosslinked hydrogels based on gum ghatti were studied to determine their absorbency and biodegradability [21,22]. Various authors synthesized electrical conducting hydrogels based on different polysaccharides and polyaniline through graft copolymerization [23][24][25][26]. The produced materials have found applications in the area of biosensors and gas sensors [3,25].…”