Conjugated Polymer of Biosensor using Langmuir-Blodgett Technique-A Review

Abstract

Health biosensor applications based on conjugated polymer have gained many attentions among researchers because of their sensitivity, selectivity, and linearity. Polyaniline, a conjugated conducting polymer has been explored since the early 1960s and one of the famous conducting polymer compare to the others like polypyrrole, polyacetylene, and polythiophene. Polyaniline is ease to synthesis, high conductivity, and good performance in biosensor applications. A doping approach using protonic acids (hydrocholoric acid, 4-dodecylbenzenesulfonic acid, sulfuric acid, phosphoric acid) can be utilized to increase solubility and induce fusibility of the stiff chain of the polymer. A structural modification of doping process could make the polymer become high conductivity and it was universally agreed about that. Polyaniline presents ionic conductivity and electronic combinations that make bio-interfaces exist among the other electrochemical applications. The conductivity of the polymer is one of the promising materials that may be used to improve the analytical properties of sensors. Langmuir-Blodgett technique is a method to produce thin film of polyaniline therefore the conductivity of polyaniline can be measured using four-point probe device.