Fabrication, Characterization and Application of Polyaniline-Polyelectrolyte Coated CaCO3 Microparticles Core-Shell Structure

Abstract

Polyaniline(PAN) was in-situ formed around calcium carbonate(CaCO3) microparticles previously stabilized with polyelectrolyte layers(PEs),generating PAN/(PEs) 6/CaCO3 hybrid microparticles.The effects of PEs and concentration of aniline monomer on the stability and morphology of the hybrid microparticles were studied.The obtained hybrid microparticles were characterized by SEM,FT-IR,UV-Vis,etc.Furthermore,the hybrid microparticles were deposited on glassy carbon electrode,which displayed high electrocatalytical activity toward the oxidation of dopamine(DA).The oxidized peak potential was negatively shifted with a value of 130 mV,compared with that using pure CaCO3 microparticles.The modified electrode showed good reproducibility,and the relative standard deviation(RSD) was estimated to be about 4.2% in 4.0 mmol/L DA aqueous solution(n =5).The obtained hybrid microparticles have great potential in construction of biosensors.The linear range was in the range of 0.5~10.0 mmol/L,with the detection limit of 0.2 mmol/L(3 S/N).