Journal
SYNTHETIC METALS
Volume 159, Issue 19-20, Pages 2022-2028Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2009.07.009
Keywords
Polythiophene; Silica; Nanocomposite; Surfactant; Glucose biosensor
Funding
- Scientific and Technological Research Council of Turkey [106T134]
- Ministry of Education of Slovakia
- Slovak Academy of Sciences [2/7103/27]
- Turkish-Slovak bilateral [107T880]
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Conducting polythiophene/SiO2 (PT/SiO2) nanocomposites were prepared in the presence of three different surfactants (anionic, cationic and non-ionic) via chemical oxidative polymerization in an anhydrous medium to create an enzyme-immobilized polymeric amperometric biosensor. An anionic surfactant, sodium dodecylbenzenesulfonate (DBSNa), a cationic surfactant, tetradecyltrimethylammonium bromide (TTAB), and a non-ionic surfactant, poly(ethylene oxide)(20) sorbitan monolaurate (Tween 20), were used as additives. The properties of the nanocomposites were investigated, as a function of surfactant type and the amount of PT contained, by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The SEM results reveal that all PT/SiO2 samples form nanometer-dimensioned globular structures. The highest conductivity obtained was 2.7 x 10(-2) S cm(-1) for a PT/SiO2-Tween 20 nanocomposite. Thermogravimetric analysis (TGA) shows that the residue decreases with increasing amount of PT. Glucose oxidase (GOX) was immobilized by crosslinking to the conducting PT/SiO2 composites and was used for amperometric detection of glucose. (C) 2009 Elsevier B.V. All rights reserved.
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