Electronic structure of polypyrrole films

Bätz, P.; Schmeißer, Dieter; Göpel, Wolfgang

doi:10.1103/physrevb.43.9178

Cited by 90 publications

(37 citation statements)

References 66 publications

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“…6) indicates the presence of three non-equivalent nitrogen heteroatoms attributed to neutral amine nitrogen (-NH-) in the pyrrole ring and positively charged amine nitrogen species N C and N 2C . 27,28 The latter arises from the presence of bipolaron defects-dications spatially localized along the PPy chain. 40 The O 1s spectrum has been fitted with two peaks corresponding to oxygen in the sulphonate group SO 3 of DBSA and C-OH groups.…”

Section: )mentioning

confidence: 99%

Surface and electrochemical study of DBSA‐doped polypyrrole films grown on stainless steel

Prissanaroon

Brack

Pigram

et al. 2002

Surface & Interface Analysis

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Electrically conducting polypyrrole films doped with dodecylbenzenesulphonic acid (PPy-DBSA) have been electrochemically polymerized on stainless steel. The surface and electrochemical properties of the films were investigated by a combination of cyclic voltammetry (CV), scanning electron microscopy (SEM) and x-ray photoelectron spectroscopy (XPS). The CV results showed an irreversible reaction of electropolymerization. All PPy-DBSA films had a nodular or cauliflower-like surface morphology. The grain size was dependent on the growth current density and the growth time. The ratio of incorporated DBSA anions to pyrrole repeat units in the films was ∼1 : 2. The doping level, calculated from the positive charge accumulated in the polymer chain (at.% ratio .N + + N 2+ //N total /, varied as a function of the growth current density and the growth time. The maximum doping level occurred at a growth current density of 0.5 mA cm −2 , consistent with an oxidation peak of the pyrrole monomer observed by CV. The interfacial layer between the polymer and substrate was also studied. A sulphur-rich layer was observed, indicating the presence of a thin layer of DBSA at the interface. In addition, iron was detected on the metal side of the film as a result of its dissolution from the stainless-steel electrode during the electropolymerization process. These results have implications for the use of polypyrrole films as environmentally friendly corrosion mitigants.

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Section: )mentioning

confidence: 99%

Surface and electrochemical study of DBSA‐doped polypyrrole films grown on stainless steel

Prissanaroon

Brack

Pigram

et al. 2002

Surface & Interface Analysis

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“…Out of these three absorption peaks, one prominent broad peak is observed around 430-470 nm and two broad peaks at 400-1000 nm. Different spectroscopic techniques [33] and theoretical energy band calculation [34] indicate that the absorption band at 400-500 nm is assigned to π-π * transition of polypyrrole. Upon doping PPY exhibits an unusual electronic structure due to electron-phonon coupling.…”

Section: Resultsmentioning

confidence: 99%

CdS Nanoparticles: Glucose/Starch Synthesis Method and Non Linear Electrical Properties Disperse in Polypyrrole Matrix

Dutta¹

2018

e-J. Surf. Sci. Nanotech.

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Development of environmentally benign methods for the synthesis of nanoparticles is an evolving important branch of nanotechnology. Inorganic-organic hybrid nanocomposites are synthesized by dispersing nanosized CdS in the conducting polypyrrole (PPY) matrix. The samples are characterized by X-ray diffraction, transmission and scanning electron microscopes and UV-VIS spectrophotometer. The wavelength of optical absorption peak of CdS nanoparticle increases from 430 nm to 470 nm with the decrease of polypyrrole concentration. Studies on dc electrical conductivity as a function of temperature suggest that three dimensional Mott's hopping process occurs in CdS-Polypyrrole nanocomposites. The incorporation of CdS nanoparticles enhances the barrier height. The barrier height increases with the content of CdS. The observed nonlinear current-voltage characteristics are satisfactorily explained using the Schottky type barriers.

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“…23 These two peaks may be associated with cross-linked carbons, chain-terminating carbons and overoxidized carbons in polypyrrole chains. 34,35 The shakeup satellite observed on the high-binding-energy side of the C 1s spectrum is due to the aromatic ring of DBSA 36 and the conjugated structure in polypyrrole chains. 37 It is known that the shake-up structure is most prominent in polymer systems where either the backbone or some pendant groups are unsaturated.…”

Section: Surface Study Of Polypyrrole Film Deposited On the Cu/ptfe Smentioning

confidence: 98%

“…The main component peak at 400.4 eV is attributed to the neutral nitrogen respectively. 34,35 The appearance of the positively charged species corresponds to bipolaron defects along the polypyrrole chain. 38 The O 1s spectrum (Fig.…”

Section: Surface Study Of Polypyrrole Film Deposited On the Cu/ptfe Smentioning

confidence: 99%

Electropolymerization of DBSA‐doped polypyrrole films on PTFE via an electroless copper interlayer

Prissanaroon

Brack

Pigram

et al. 2003

Surface & Interface Analysis

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We report on the electroless deposition of thin films of copper on poly(tetrafluoroethylene) (PTFE) and their use as substrates for electropolymerization of polypyrrole. Argon plasma-treated PTFE films were modified by silanization using N-[3(trimethoxysilyl)propyl]diethylenetriamine (TMS). The TMSmodified PTFE films were subsequently activated by PdCl 2 for the electroless deposition of copper. The omission of the commonly used SnCl 2 sensitization step represents a significant process enhancement with environmental and cost benefits. The surface composition of the substrate (before and after surface treatments) and overlayer films was studied using high-resolution x-ray photoelectron spectroscopy. A combination of time-of-flight secondary ion mass spectrometry and water contact-angle measurements was also used to study the PTFE surface after argon plasma treatment. The Cu/PTFE films were used as substrates for subsequent pyrrole electropolymerization in aqueous dodecylbenzene sulphonic acid (DBSA) solution. The DBSA-doped polypyrrole overlayers were successfully deposited on the Cu/PTFE surface using a constant applied potential of 1.5 V. The resulting material exhibited a doping level of 39%, determined using chemical component analysis of the N 1s photoelectron peak.

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Electronic structure of polypyrrole films

Cited by 90 publications

References 66 publications

Surface and electrochemical study of DBSA‐doped polypyrrole films grown on stainless steel

Surface and electrochemical study of DBSA‐doped polypyrrole films grown on stainless steel

CdS Nanoparticles: Glucose/Starch Synthesis Method and Non Linear Electrical Properties Disperse in Polypyrrole Matrix

Electropolymerization of DBSA‐doped polypyrrole films on PTFE via an electroless copper interlayer

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