In Situ Polymerization of Pyrrole in Mesoporous Silica and Application to Electrode Modification

摘要

A hybrid system of mesoporous silica (MS) particles coated with polypyrrole (PPy) was constructed through chemical polymerization of pyrrole in the presence of the MS particles. The MS-PPy composite particles with immobilized hemoglobin (Hb) were used to modify a glassy carbon electrode (GCE) for detecting the electrocatalytic response to the reduction of hydrogen peroxide. The structure of composite particles and the performance of biosensors were characterized by SEM, TEM, FT-IR, cyclic voltammetry (CV), and amperometric measurements, respectively. The results show that the PPy shell is uniformly coated over the silica surface without using any agent to modify the MS particles. Under optimal conditions, the sensors had a fast response of hydrogen peroxide (H₂O₂). The catalytic currents are linearly proportional to the concentrations of H₂O₂ in the range from 0.01 to 1.2Â mM, and the corresponding detection limits are 0.01Â mM (S/NÂ =Â 3).View full textDownload full textKeywordsBiosensors, Conducting polymers, Electrochemistry, Nanocomposites, PolypyrrolesRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/10236661003669458