Electrolyte type and concentration effects on poly(3-(2-aminoethyl thiophene) electro-coated on glassy carbon electrode via impedimetric study
Yükleniyor...
Dosyalar
Tarih
2013
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, 3-(2-Aminoethyl thiophene) (2AET) monomer was electropolymerized on glassy carbon electrode (GCE) using various electrolytes (lithium perchlorate (LiClO4), sodium perchlorate (NaClO4), tetrabutyl ammonium tetra fluoroborate (TBABF(4)) and tetraethyl ammonium tetra fluoroborate (TEABF(4)) in acetonitrile (CH3CN) as solvent. Poly(3-(2-aminoethyl thiophene) (P(2AET))/GCE was characterized by cyclic voltammetry (CV), Fourier transform infrared reflectance spectrophotometry (FTIR-ATR), scanning electron microscopy, energy dispersive X-ray analysis (EDX), and electrochemical impedance spectroscopy (EIS) techniques. The electrochemical impedance spectroscopic results were given by Nyquist, Bode-magnitude, Bode-phase, capacitance and admittance plots. The highest low frequency capacitance (C-LF) value obtained was 0.65 mF cm(-2) in 0.1 M LiClO4/CH3CN for the initial monomer concentration of 1.5 mM. The highest double layer capacitance (C-dl = similar to 0.63 mF cm(-2)) was obtained in 0.1 M LiClO4/ACN for [2AET](0) = 0.5, 1.0 and 1.5 mM. The maximum phase angles (theta = 76.1 degrees at 26.57 Hz) and conductivity (Y '' = 3.5 mS) were obtained in TEABF(4)/ACN for [2AET](0) = 0.5 and 1.0 mM, respectively. An equivalent circuit model of R(Q(R(Q(R(CR))))) was simulated for different electrolytes (LiClO4, NaClO4, TBABF(4) and TEABF(4))/P(2AET)/GCE system. A good fitting was obtained for the calculated experimental and theoretical EIS measurement results. The electroactivity of P(2AET)/GCE opens the possibility of using modified coated electrodes for electrochemical micro-capacitor electrodes and biosensor applications.
Açıklama
Anahtar Kelimeler
3-(2-Aminoethyl thiophene), Electrolyte, Scanning electron microscopy, Concentration, Circuit model, Electrochemical Impedance Spectroscopy, Fiber Microelectrodes, Conjugated Polymers, Polymerization, Polythiophene, Polycarbazole, Polyaniline, Derivatives, Pyrrole, Mechanism
Kaynak
Iranian Polymer Journal
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
22
Sayı
3
