Murat Ates

A Study of the Electrochemical Behavior of Poly [N-Vinyl Carbazole] Formed on Carbon-Fiber Microelectrodes and Its Response to Dopamine

<para> N-vinyl carbazole (NVCz) random polymers were electrochemically coated onto micron-size carbon fibers in lithium perchlorate/acetonitrile <formula formulatype=inline><tex>

Characterization of Micrometer-Sized Thin Films of Electrocoated Carbazole with p-Tolylsulfonyl Pyrrole on Carbon Fiber Microelectrodes

({hbox {LiClO}}_{4} /{hbox {ACN}})

Comparative Study of Chemical and Electrochemical Copolymerization of N-Methylpyrrole with N-Ethylcarbazole Spectroscopic and Cyclic Voltammetric Analysis

</tex></formula>, sodium perchlorate/acetonitrile <formula formulatype=inline><tex>

ELECTROCHEMICAL COPOLYMERIZATION OF N-METHYL PYRROLE WITH CARBAZOLE

({hbox {NaClO}}_{4} /{hbox {ACN}})

Carbon fiber microelectrodes electrocoated with polycarbazole and poly(carbazole-co-p-tolylsulfonyl pyrrole) films for the detection of dopamine in presence of ascorbic acid

</tex></formula>, and tetraethylammonium tetrafluoroborate/acetonitrile <formula formulatype=inline><tex>

Electrochemical impedance spectroscopy and morphological analyses of pyrrole, phenylpyrrole and methoxyphenylpyrrole on carbon fiber microelectrodes

({hbox {TEABF}}_{4} /{hbox {ACN}})

Electrolyte and solvent effects of electrocoated polycarbazole thin films on carbon fiber microelectrodes

</tex></formula> solutions in order to form dopamine-sensing layers on the carbon fiber microelectrodes (CFMEs). The resulting micron-thick polymer films were characterized by using scanning electron microscopy and Fourier transform infrared reflectance spectroscopy. Electrocoating of polymeric film was performed by three different electrochemical methods such as cyclic voltammetry and chronoamperometric and chronopotentiometric polarizations. These modified CFMEs were tested against dopamine by applying only cyclovoltammetric techniques. Under optimum experimental conditions, the electrode shows a reversible and stable behavior during 24 days in a 0.1-M <formula formulatype=inline><tex>

Electrochemical impedance spectroscopy of poly[carbazole-co-N-p-tolylsulfonyl pyrrole] on carbon fiber microelectrodes, equivalent circuits for modelling

{hbox {TEABF}}_{4} /{hbox {ACN}}

Electrochemical Impedance Spectroscopic Study of Polyaniline on Platinum, Glassy Carbon and Carbon Fiber Microelectrodes

</tex></formula> solution and, hence, can be considered as a promising sensor for dopamine detection. The dopamine detection limit as low as 0.01 nM (3S/N) was obtained for the polymer film formed among applied cyclic voltammetry, chronoamperometry, and chronopotentiometry. The polymer film was demonstrated to offer high selectivity toward dopamine detection in the presence of ascorbic acid. </para>

Polycarbazole modified carbon fiber microelectrode: Surface characterization and dopamine sensor

Carbazole (Cz) monomers with p-tolylsulfonyl pyrrole (pTsp) (used as self-dopant) were electrochemically coated onto micrometer-sized carbon fiber by potentiodynamic method. The resulting micrometer-sized thin films of homopolymer and copolymers were characterized by using electrochemical methods (i.e., cyclic voltammetry), solid-state conductivity measurements (four-point probe), spectrophotometric methods (in situ spectroelectrochemistry), Fourier transform infrared reflectance spectroscopy, and scanning electron microscopy. Cyclic voltammetric results indicate that an increase of pTsp concentration in copolymer formation (while the Cz concentration was kept constant) current density increases randomly. The maximum anodic current density was obtained as 0.49 μA cm -2 by the initial feed ratio of [pTsp] 0 /[Cz] 0 = 5. This is three times higher than the anodic current density of polycarbazole (PCz) (0.15 μA cm -2 ). The electrocoated copolymer corresponding to an initial feed ratio of [pTsp] 0 /[Cz] 0 = 5 was observed as polaron and bipolaron on indium tin oxide (ITO) by UV-vis spectrophotometry. The solid-state conductivity was measured with a four-point probe apparatus. Results show that a tenfold increase in Cz concentration leads to an increase in conductivity from 0.08 to 6.36 mS cm -1 , and also raises yields from 13.69% to 97.72%. In contrast, a 10 times increase in pTsp concentration leads to a decrease in conductivity from 0.39 to 0.02 mS cm -1 , and also decreases yields from 21.72% to 2.82% which is due to the polymers bulky structure. The efficiency of the electropolymerization process on the carbon fiber surfaces by cyclic voltammetry, depending on the experimental conditions, was evaluated to ascertain the effects of copolymer thickness, dopant, optical bandgap (Eg), and the redox parameters (anodic and cathodic potentials, E a ,E c ), oxidation peak potentials, E ox, and stability test of electrodes.