Polythiophene/SiO2 nanocomposites prepared in the presence of surfactants and their application to glucose biosensing

Uygun A., Yavuz A. G., ŞEN GÜRSOY S., Omastova M.

SYNTHETIC METALS, vol.159, pp.2022-2028, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 159
  • Publication Date: 2009
  • Doi Number: 10.1016/j.synthmet.2009.07.009
  • Journal Name: SYNTHETIC METALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2022-2028
  • Süleyman Demirel University Affiliated: Yes


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.