A spectroscopic study of the growth and redox processes of electrodeposited polybithiophene films

Bock, Alexander; Topeters, André; Kryschi, Carola

doi:10.1016/0379-6779(95)03394-y

Cited by 9 publications

(2 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to Bock et al [32], the mean effective conjugation length varies according to film thickness, and may be attributed to morphological changes during film growth. Initially, the mean effective conjugation length increases with thickness, but after a certain value, an increase in linkage defects and conformational disorder in the polymeric chain occurs, which limits the mean effective conjugation length to a near constant value.…”

Section: Film Thickness and Surface Characterizationmentioning

confidence: 99%

Electrochemical and morphological characterization of poly[(R)-(−)-3-(l-pyrrolyl)propyl-N-(3,5-dinitrobenzoyl)-α-phenylglycinate] films deposited on ITO electrodes

Ribeiro

Silva

Ribeiro

et al. 2005

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

Section: Film Thickness and Surface Characterizationmentioning

confidence: 99%

Electrochemical and morphological characterization of poly[(R)-(−)-3-(l-pyrrolyl)propyl-N-(3,5-dinitrobenzoyl)-α-phenylglycinate] films deposited on ITO electrodes

Ribeiro

Silva

Ribeiro

et al. 2005

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

“…Polythiophenes have a good chemical stability upon environmental conditions and produce stable interfaces with electrode metals commonly used in electronics, like aluminum and gold [1,2]. Another important feature of polythiophene films is a large absorption coefficient in the visible range of the electromagnetic spectrum [3,4,5]. These characteristics make polythiophene and its derivatives interesting materials for solar cell applications [6].…”

mentioning

confidence: 99%

The electronic behavior of poly(3-octylthiophene) electrochemically synthesized onto Au substrate

Valaski¹,

Moreira²,

Micaroni³

et al. 2003

Braz. J. Phys.

View full text Add to dashboard Cite

We investigate the electronic characteristics and the absorption spectra of poly(3-octylthiophene), POT, films grown by electrochemical methods onto Au substrates. We discuss the results considering the morphological factor. POT films thickness can be controlled by current density in the electropolymerization process. The film roughness depends on the thickness, being about 12% of film thickness. The samples for electrical measurements were made in sandwich structure, Au/POT/metal (metal: Ni, Al). Analyzing current-voltage data we were able to estimate the positive charge carrier mobility (5×10 −4 cm 2 V −1 s −1 ) and the potential barrier height in the metal/polymer interfaces (0.1 eV for Au/POT and Ni/POT and 0.85 eV for Al/POT). I IntroductionConjugated polymers have been object of intense research in the last years. These organic semiconductors present good mechanical features, facility of production and offer the possibility of construction of devices with larger active areas than their inorganic counterparts. Among these polymers, polythiophene and its derivatives have received special considerations. Polythiophenes have a good chemical stability upon environmental conditions and produce stable interfaces with electrode metals commonly used in electronics, like aluminum and gold [1,2]. Another important feature of polythiophene films is a large absorption coefficient in the visible range of the electromagnetic spectrum [3,4,5]. These characteristics make polythiophene and its derivatives interesting materials for solar cell applications [6]. One of the major problems in polymer devices is the small charge carrier mobility. The morphology of the polymer film takes important place in this situation. In amorphous materials the transport occurs via hopping between localized states and disorder contributes to a further reduction of mobility. Many methods have been used to improve the order degree or the crystallinity in polymer films [7,8]. The use of polymers with large side chain segments is one of the methods employed with this intent. The increase in the side chain length improves the order and the planarity of the polymer chains [9]. So, the order is expected to be higher in poly(3-octylthiophene), POT, than in other polythiophene derivatives, like poly(3-metylthiophene) and consequently, also the charge carrier mobility.When a potential barrier energy ϕ for the charge carriers injection at the interface between the electrode and the polymer is so that ϕ >> kT (k is the constant of Boltzmann and T is the absolute temperature) the transport is better described by Simmons current density expression, derived for thermionic injection into low mobility materials [10].

show abstract

Electrochemical characterization for polybithiophene film on porous oxide layer of 304 stainless steel formed by square wave passivation

Liu

Chen

Huang

2010

Materials & Corrosion

View full text Add to dashboard Cite

A bilayer coating was prepared by electrodepositing a polybithiophene (PBT) film on the top of square wave passivated 304 stainless steel (304SS). The structure of the PBT layer was characterized by FTIR spectroscopy and suggested to be composed of α–α coupling thiophene units. The electrochemical properties of the coating were investigated in 1 mol/L sulfuric acid solution by anodic polarization and electrochemical impedance spectroscopy measurements. The results indicated that the bilayer could provide an effective barrier and maintain the metal substrate in a passive state during the immersion time. The interfacial shear strength of the polythiophene film on untreated and passivated 304SS were 0.81 and 5.1 MPa, respectively. The better result given by treated one may be due to PBT growing within the pores formed on the square wave passivated 304SS.

show abstract

A spectroscopic study of the growth and redox processes of electrodeposited polybithiophene films

Cited by 9 publications

References 15 publications

Electrochemical and morphological characterization of poly[(R)-(−)-3-(l-pyrrolyl)propyl-N-(3,5-dinitrobenzoyl)-α-phenylglycinate] films deposited on ITO electrodes

Electrochemical and morphological characterization of poly[(R)-(−)-3-(l-pyrrolyl)propyl-N-(3,5-dinitrobenzoyl)-α-phenylglycinate] films deposited on ITO electrodes

The electronic behavior of poly(3-octylthiophene) electrochemically synthesized onto Au substrate

Electrochemical characterization for polybithiophene film on porous oxide layer of 304 stainless steel formed by square wave passivation

Contact Info

Product

Resources

About