Vibrational spectroscopy of polypyrrole, theoretical study

Kostić, R.; Raković, D.; Stepanyan, S. A.; Davidova, I.E.; Грибов, Л. А.

doi:10.1063/1.468620

Cited by 140 publications

(87 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar to the previously reported graphene/polypyrrole composite materials, they are overlapped with the D-band and G-band of graphene [29]. Since these rGO-PPy respectively [30,31]. The band at 1150 cm -1 is due to the stretching vibration of the sulfonate group in pTS [32].…”

Section: Resultssupporting

confidence: 64%

A Free-standing Graphene-Polypyrrole Hybrid Paper via Electropolymerization with an Enhanced Areal Capacitance

Shu

Wang

Zhao

et al. 2016

Electrochimica Acta

View full text Add to dashboard Cite

Here we developed a free-standing reduced graphene oxide (rGO)-polypyrrole (PPy) hybrid paper via electropolymerization on a paper-like graphene gel. This flexible hybrid paper displayed a uniform layered structure with PPy coated onto the graphene layers. A high areal mass of 2.7 mg cm−2 could be obtained. It delivered a greatly enhanced areal capacitance of 440 mF cm−2 at 0.5 A g−1, in contrast to that 151∼198.5 mF cm−2 previously reported for graphene paper or polypyrrole-graphene paper. It can retain ∼81% of the initial capacitance at a high current density of 6 A g−1. The combined high flexibility with outstanding electrochemical performance, makes such novel hybrid paper a promising electrode for flexible supercapacitors. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsShu, K., Wang, C., Zhao, C., Ge, Y. & Wallace, G. G. (2016). A free-standing graphene-polypyrrole hybrid paper via electropolymerization with an enhanced areal capacitance. Electrochimica Acta, 212 561-571. AbstractHere we developed a free-standing reduced graphene oxide (rGO)-polypyrrole (PPy) hybrid paper via electropolymerization on a paper-like graphene gel. This flexible hybrid paper displayed a uniform layered structure with PPy coated onto the graphene layers. A high areal mass of 2.7 mg cm -2 could be obtained. It delivered a greatly enhanced areal capacitance of 440 mF cm -2 at 0.5 A g -1 , in contrast to that 151~198.5 mF cm -2 previously reported for graphene paper or polypyrrole-graphene paper. It can retain ~81% of the initial capacitance at a high current density of 6 A g -1 . The combined high flexibility with outstanding electrochemical performance, makes such novel hybrid paper a promising electrode for flexible supercapacitors.

show abstract

Section: Resultssupporting

confidence: 64%

A Free-standing Graphene-Polypyrrole Hybrid Paper via Electropolymerization with an Enhanced Areal Capacitance

Shu

Wang

Zhao

et al. 2016

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

“…This is the tail of the ~1 eV (~8066 cm -1 ) bipolaron absorption band, which is the signature for electrical conductivity of conducting polymers [42,43]. The broad band around 1550 cm -1 is the characteristic absorption frequency for double bond vibration of the pyrrole ring [9,37,44,45]. Proof of the presence of dexamethasone in the deposited film is clearly seen by the appearance of peaks at 3200-3500 cm -1 (hydroxyl), 2850-3000 cm -1 (methyl) and 1665-1760 cm -1 (carbonyl).…”

Section: Resultsmentioning

confidence: 99%

Electrochemically controlled release of dexamethasone from conducting polymer polypyrrole coated electrode

Wadhwa

Lagenaur

Cui

2006

Journal of Controlled Release

456

393

View full text Add to dashboard Cite

Chronic recordings from micromachined neural electrode arrays often fail a few weeks after implantation primarily due to the formation of an astro-glial sheath around the implant. We propose a drug delivery system, from conducting polymer (CP) coatings on the electrode sites, to modulate the inflammatory implant-host tissue reaction. In this study, polypyrrole (PPy) based coatings for electrically controlled and local delivery of the ionic form of an anti-inflammatory drug, dexamethasone (Dex), was investigated. The drug was incorporated in PPy via electropolymerization of pyrrole and released in PBS using cyclic voltammetry (CV). FTIR analysis of the surface showed the presence of Dex and polypyrrole on the coated electrode. The thickness of the coated film was estimated to be ~50 nm by ellipsometry. We were able to release 0.5 µg/cm 2 Dex in 1 CV cycle and upto 92% Dex after 30 CV cycles. In-vitro studies and immunocytochemistry on murine glial cells suggest that the released drug lowers the count of reactive astrocytes to the same extent as the added drug. In addition, the released drug is not toxic to neurons as seen by healthy neuronal viability in the released drug treated cells.

show abstract

“…The broad line located at 3400 cm − 1 is typical for pristine and doped polypyrrole [9]. A strong band located around 3400 cm −1 was reported in perchlorate (ClO 4− ) doped polypyrrole [10].…”

Section: Resultsmentioning

confidence: 99%

“…For heavily doped polypyrrole, a complex band structure was noticed for wavelength ranging from 1700 to 1000 cm − 1 [11]. The strongest band is located at 1640 cm − 1 and represents complex out of the plane vibrations [9]. It was suggested [8] that the band located at 1642 cm − 1 originates from amine vibrations within the pyrrole ring.…”

Section: Resultsmentioning

confidence: 99%