tailieunhanh - Photo-electrochemically behavours of ZnO nanoparticles containing polythiophene layers prepared by chemically deposition

The electrophoretic deposition (EPD) method was adopted for a fabrication of nanocomposite layers composed of ZnO particles covered by the polythiopene shell in a reduced state. This composite was prepared by oxidative polymerization of thiophene monomer with iron (III) chloride as a catalyst in the presence of ZnO particles. After polymerization, polythiophene in oxidized form was reduced by the extraction in methanol. Electrochemical properties of the obtained composite were measured by cyclic voltammetry and electrochemical impedance spectroscopy. The semiconductive behavior was studied UV photoelectrochemical measurements. | Journal of Chemistry Vol. 44 4 P. 514 - 519 2006 PHOTO-ELECTROCHEMICALLy BEHAVOURS OF ZnO NANOPARTICLES CONTAINING POLyTHIOPHENE LAyERS PREPARED By CHEMICALLy DEPOSITION Received 3 August 2005 VU Quoc TRUNG1 THAI DOAN TINH2 TRAN VINH DIEU3 JIRI PTLEGER4 URSULA RAMMELT1 WALDFNED PHETH1 institute of Physical Chemistry and Electrochemistry Dresden University of Technology Germany 2Department of Chemistry Hanoi University of Education 3Centre of Polymer and Composite Materials Hanoi University of Technology 4Institute of Macromolecular Chemistry Academy of Sciences of the Czech Republic SUMMARY The electrophoretic deposition EPD method was adopted for a fabrication of nanocomposite layers composed of ZnO particles covered by the polythiopene shell in a reduced state. This composite was prepared by oxidative polymerization of thiophene monomer with iron III chloride as a catalyst in the presence of ZnO particles. After polymerization polythiophene in oxidized form was reduced by the extraction in methanol. Electrochemical properties of the obtained composite were measured by cyclic voltammetry and electrochemical impedance spectroscopy. The semiconductive behavior was studied UV photoelectrochemical measurements. I - INTRODUCTION Coating of inorganic particles by conducting polymers has become the most popular and interesting aspect of the composite preparation. A variety of different metal and metal oxide particles have been encapsulated into the core of conducting polymers giving a huge number of nanocomposites 1 - 3 . Although these conducting polymer composites posses promising electrochemical and photoelectrochemical properties which mostly thermal mechanical and spectral properties are usually reported in the literatures since it is difficult to fabricate these composites in a form of composite layers on conductive substrates. So although these materials can be produced by quite simple methods 1 - 3 the electrochemical and photo-electrochemical 514 properties are