Conductivity Spectra of Polyphosphazene Based Polyelectrolyte Multilayers
 
Yazarlar (6)
Yahya Akgöl
University Of Münster, Almanya
Christian Hofmann
University Of Münster, Almanya
Prof. Dr. Yunus KARATAŞ University Of Münster, Türkiye
Cornelia Cramer
University Of Münster, Almanya
Hans-Dieter Wiemhöfer
University Of Münster, Almanya
Monika Schönhoff
University Of Münster, Almanya
Makale Türü Özgün Makale (SSCI, AHCI, SCI, SCI-Exp dergilerinde yayınlanan tam makale)
Dergi Adı The Journal of Physical Chemistry B
Dergi ISSN 1520-6106 Wos Dergi Scopus Dergi
Dergi Tarandığı Indeksler SSCI
Makale Dili İngilizce Basım Tarihi 07-2007
Cilt / Sayı / Sayfa 111 / 29 / 8532–8539 DOI 10.1021/jp068872w
Makale Linki http://pubs.acs.org/doi/abs/10.1021/jp068872w
Özet
Polyelectrolyte multilayers are built up from ionically modified polyphosphazenes by layer-by-layer assembly of a cationic (poly[bis(3-amino-N,N, N-trimethyl-l-propanaminium iodide)phosphazene] (PAZ+) and an anionic poly[bis(lithium carboxylatophenoxy)phosphazene] (PAZ-). In comparison, multilayers of poly(sodium 4-styrenesulfonate) (PSS) and poly(allylamine hydrochloride) (PAH) are investigated. Frequency-dependent conductivity spectra are taken in sandwich geometry at controlled relative humidity. Conductivity spectra of ion-conducting materials generally display a dc plateau at low frequencies and a dispersive regime at higher frequencies. In the present case, the dispersive regime shows a frequency dependence, which is deviating from the typical behavior found in most ion-conducting materials. Dc conductivity values, which can be attributed to long-range ionic transport, are on the order of σdc = 10-10-10-7 S·cm-1 and strongly depend on relative humidity. For PAZ +/PAZ- multilayers σdc is consistently larger by one decade as compared to PSS/PAH layers, while the humidity dependence is similar, pointing at general mechanisms. A general law of a linear dependence of log(σdc) on relative humidity is found over a wide range of humidity and holds for both multilayer systems. This very strong dependence was attributed to variations of the ion mobility with water content, since the water content itself is not drastically dependent on humidity. © 2007 American Chemical Society.
Anahtar Kelimeler
BM Sürdürülebilir Kalkınma Amaçları
Atıf Sayıları
Scopus 56
Web of Science 50
Conductivity Spectra of Polyphosphazene Based Polyelectrolyte Multilayers

Paylaş

İletişim
  • Kırşehir Ahi Evran Üniversitesi Bağbaşı Yerleşkesi, 40100, KIRŞEHİR \ TÜRKİYE
  • unis@ahievran.edu.tr
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