Scan Rate Effect of 1-(4-methoxyphenyl)-1H-Pyrrole Electro-coated on Carbon Fiber: Characterization via Cyclic Voltammetry, FTIR-ATR and Electrochemical Impedance Spectroscopy (original) (raw)
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In this study, N-pyrrole (Py), N-phenylpyrrole (PhPy), and 1[4-methoxyphenyl]-1H-pyrrole (MPhPy) homopolymers were synthesized electrochemically onto carbon fiber microelectrodes (CFMEs). The influences of the substituent effect on electrochemical impedance spectroscopy (EIS) were studied comparatively. All the monomers were electrodeposited in 0.05 M tetraethyl ammonium perchlorate (TEAP)/dichloromethane (CH2Cl2) solution and characterized by cyclic voltammetry (CV), Fourier transform infrared reflectance spectrophotometry (FTIR-ATR), scanning electron microscopy (SEM), and atomic force microscopy (AFM). The morphological study reveals that the polymers were deposited as a continuous and well adhered film to surface of the CFME. An equivalent electrical circuit for three different monomers on CFMEs was proposed and experimental data were simulated to obtain the numerical values of circuit components. All results support the high quality film deposition that resulted in desired electronic properties due to the electron donating behaviors of substituent group of phenyl and methoxy. © 2008 Elsevier B.V. All rights reserved.
In this study, films of poly[1-(4-methoxyphenyl)-1H-pyrrole] [poly(MPPy)] were electrochemically grown on carbon fiber microelectrodes (CFMEs) in 0.05 M of tetraethyl ammonium perchlorate–dichloromethane. The effect of different monomer concentrations (range = 1–10 mM) on electrochemical properties of resulting polymers was characterized by cyclic voltammetry, Fourier transform infrared reflectance-attenuated total reflection spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and electrochemical impedance spectroscopy. All modified CFMEs were found to have capacitance on the basis of Nyquist, Bode-magnitude, Bode-phase, and Admittance plots. An equivalent circuit model of (R(C(R(QR)))(CR)) gave the best fit for all monomer
Polycarbazole (PCz) and copolymerization of carbazole (Cz) and N-p-tolylsulfonyl pyrrole (pTsp), P(Czco- pTsp), thin films have been cyclovoltammetrically coated onto carbon fiber electrodes as an active functionalized microelectrode in sodium perchlorate (NaClO4)/acetonitrile (ACN) medium. The resulting thin films of homopolymer and copolymer were characterised by using Fourier transform infrared reflectance spectroscopy (ATR-FTIR), energy dispersive X-ray (EDX) point analysis, scanning electron microscopy (SEM) and atomic force microscopy (AFM). An electrical impedance study on the prepared electrodes is reported in the present paper under different feed ratios of [pTsp]0/[Cz]0 during electrochemical impedance spectroscopic (EIS) measurements. Specific capacitance (Csp) were calculated, P(Cz-co-pTsp) in feed ratio of [pTsp]0/[Cz]0 = 200 has preserved more capacitive behavior especially at lower frequency (Csp =∼156mFg−1) than polycarbazole (Csp =∼2.1mFg−1. The electrochemical impedance data fitted to three different equivalent models were used to find out numerical values of the proposed components.
In this study, N-thiophene (T), and N-2 methylthiophene (MT) homopolymers were electrocoated on carbon fiber microelectrodes (diameter ~7 μm) by cyclic voltammetry within a potential range from 0.0 to 2.0 V with well – defined parameters. All the initial monomer concentrations (from 0.1 M to 1 M) were electrodeposited in 0.1 M sodium perchlorate (NaClO4) / acetonitrile (ACN) solution and characterized by cyclic voltammetry (CV), ex-situ FTIR attenuated total reflectance spectroscopy (FTIR – ATR), and scanning electron microscopy (SEM). The electrochemical impedance spectroscopic measurements of polythiophene (PT) and poly (2-methyl thiophene) (PMT) were given comparatively. The existence of a capacitance behavior is shown by Nyquist, Bode magnitude, Bodephase, Admittance plots relationship. The T-deposited electrode in the initial monomer concentration of 0.5 M exhibits high specific capacitance of 1.13 F g-1, in comparison with a value of 6.35 mF g-1 for MT modified electrode in the initial monomer concentration of 0.2 M.
Methyl pyrrole (N-MPy) and 2-(9H-carbazole-9-yl) ethyl methacrylate (CzEMA) monomers were electrocopolymerized on carbon fiber microelectrode (CFME) as an active electrode material. The electropolymerization of monomers was studied in 0.1Msodium perchlorate (NaClO4)/acetonitrile (ACN) solution. The detailed characterization of the resulting electrocoated poly(N-MPy-co-CzEMA)/ CFME thin films was studied by various techniques, i.e., cyclic voltammetry (CV), Scanning electron microscopy – Energy Dispersive X-ray analysis (SEM-EDX), and Electrochemical impedance spectroscopy (EIS). The effects of monomer mole fractions (mole fraction, XCzEMA¼nCzEMA/nMPyþnCzEMA) (0.5, 0.66, 0.75, 0.83 and 0.91) during the preparation of modified electrodes were examined by EIS. Capacitive behaviors of modified CFMEs were defined via Nyquist, Bode-magnitude, Bode-phase and Capacitance plots. Circuit model of R(Q(R(C(R(C(RW))))))(CR) was suggested to fit the theoretical and experimental values. The lowest low frequency capacitance value and total charge (Q¼112.9 mC) during electrodeposition of polymer thin film by CV method in the mole fraction of XCzEMA¼0.75 (CLF¼27.2 mF cm2). However, the highest double layer capacitance of polymer/electrolyte system (C1¼25.4 mF cm2; C2¼159.1 mF cm2; C3¼4.54 mF cm2) was obtained in the same mole fraction.
2008
Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2008Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2008Bu çalışmada, polietilendiyoksitiyofen homopolimeri ile polietilendiyoksitiyofen ¶tolisülfonilpirol kopolimerinin karbon-fiber mikro buton elektrod üzerindeki elektrokimyasal polimerizasyonları gerçekleştirilmiştir.Elektropolimerizasyon ve dopamin tayini için döngülü voltametri, diferansiyel puls voltametri ve kronoamperometri gibi yöntemler kullanılmıştır.Ayrıca, polietilendiyoksitiyofen kaplanmış elektrodun farklı dopamin derişimine sahip çözeltilerde elektrokimyasal empedans spektroskopi karakterizasyonu yapılmış,eşdeğer devre modeli çizilmiştir.Buradaki sonuçlar,çözeltideki dopamine konsantrasyonunun empdedans değerlerini etkilediği yönünde olmuştur.In this thesis, the electrochemical coatings of PEDOT and P(Edot-co-pTsp) copolymer onto carbonfiber micro button electrode were examined. Different electropol...