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Titolo:
Polypyrrole films investigated by electrochemical quartz crystal oscillator and four-probe techniques
Autore:
Lee, SY; Bae, SE; Paek, SH; Lee, CW;
Indirizzi:
Korea Univ, Div Nat Sci, Jochiwon 339700, Choongnam, South Korea Korea Univ Jochiwon Choongnam South Korea 339700 , Choongnam, South Korea Korea Univ, Grad Sch Biotechnol, Seoul 136701, South Korea Korea Univ Seoul South Korea 136701 iotechnol, Seoul 136701, South Korea
Titolo Testata:
SYNTHETIC METALS
fascicolo: 1-3, volume: 117, anno: 2001,
pagine: 105 - 107
SICI:
0379-6779(20010215)117:1-3<105:PFIBEQ>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYMERS;
Keywords:
polypyrrole; quartz crystal oscillator; viscoelasticity; temperature dependence; conductivity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Lee, CW Korea Univ, Div Nat Sci, Jochiwon 339700, Choongnam, South Korea Korea Univ Jochiwon Choongnam South Korea 339700 nam, South Korea
Citazione:
S.Y. Lee et al., "Polypyrrole films investigated by electrochemical quartz crystal oscillator and four-probe techniques", SYNTH METAL, 117(1-3), 2001, pp. 105-107

Abstract

Electrochemical quartz crystal oscillator and four-probe techniques were employed to investigate the changes in microrheological properties of polypyrrole (PPy) during electrochemical growth in aqueous electrolyte solutions and the four-probe resistivity with the electrochemically grown PPr films, respectively. PPy films grew elastic at the initial stage and viscoelastic at the later stage in hydrochloric acid solution, while the films remained nearly elastic in the whole range of the thickness examined (8000 Hz) in sulfuric acid solution. Usual negative temperature coefficient of resistivity(TCR) was observed from 77 to 300 K with most PPy samples, but the crossover of TCR with a broad minimum peak near 200 K was found with PPy samples prepared at 0.8 V versus SCE in both hydrochloric acid and sulfuric acid solution. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 14:29:47