Metal nano parçacık modifiye kompozit film elektrotların hazırlanması, karakterizasyonu ve uygulamaları

The first of the two main objectives of this thesis is that to prepare composite modified electrode surfaces with high catalytic activity which used as an anode and cathode material in fuel cells, characterize their surface morphology and perform electrochemical applications. For this purpose, various metal nanoparticles modified polymer film (poly p-aminophenol) and phthalocyanine-carbon nanotube modified composite electrodes were prepared in order to investigate the both methanol and dimethylamine borane (DMAB) oxidation and electrocatalytic oxygen reduction. The best catalytic activity for DMAB oxidation was obtained on sequentially electrochemical depositited Ag and Au nanoparticles modified poly(p-aminophenol) (PAP) film glassy carbon electrode (GCE). In methanol and DMAB oxidation studies on nanoparticles modified phthalocyanine-carbon nanotube composite electrodes in alkaline medium, the best catalytic activity for methanol and DMAB oxidation performed at electrochemically deposited Au-Pt modified copper phthalocyanine-carbon nanotube (CuPc-CNT)GC and gold nanoparticles modified CuPc-CNT/GC electrodes, respectively. In case of investigation of electrochemical oxygen reduction reaction in alkaline medium, the best catalytic surface was established as platinum nanoparticles modified CuPc-CNT/GC electrode surface. Second objective of the thesis is that to develop modified electrodes for the selective and sensitive determination of theophylline (TP) and caffeine (CAF). For this purpose, new synthesized organic groups functionalized manganese phthalocyanines (2eOHMnPc) combined with carbon nanotubes in order to obtaine composite modified surfaces and electrochemical behaviour of TP and CAF was investigated in sulphuric acid medium. The TP and CAF content in real sample analysis of green tea, cola and medicine was determined with the prepared 2eOHMnPc-CNT/GC electrodes. The detection limits of individual TP and CAF were established as 6.6x10-9 M ve 5.0x10-8 M, respectively. In case of the constant concentration of one analyte with increasing concentration of other, the limit of detection values were calculated as 8.1x10-9 M ve 3.0x10-7 M for TP and CAF, respectively. The surface characterizations of prepared metal nanoparticles modified polymer film and phthalocyanine-carbon nanotube electrode were performed by X-ray photoelectron spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffraction and electrochemical impedance spectroscopy