| Yazarlar |
Yahya AkgöL
|
|
Cornelia Cramer
|
|
Christian Hofmann
|
Yunus KARATAŞ
Ahi Evran Üniversitesi, Türkiye |
|
Hans-Dieter WiemhöFer
|
|
Monika SchöNhoff
|
| Özet |
| A range of different combinations of polyelectrolytes is employed to form multilayers by layer-by-layer assembly, which are investigated by impedance spectroscopy. In particular, the alkali counterion employed in the layer formation is varied. Impedance spectra of different multilayer systems are qualitatively similar, and they are changing in a similar way with relative humidity (RH). From the spectra, the dc conductivity ωdc and its dependence on humidity are extracted. The humidity dependence of ωdc follows a general law of log(ωdc) = aRH + b, which is valid for all systems. Absolute values of ωdc and slopes a depend on the type of polyelectrolytes employed but are independent of the type of alkali counterion involved. On the basis of these data, we discuss the contribution of different small ionic species, i.e., anions, alkali cations, or protons, to the conductivity and conclude that the differences between different polymer systems as well as the humidity dependence are consistent with the conduction of protons or hydronium ions, while the contribution of other cations or anions to ωdc is negligible. © 2010 American Chemical Society. |
| Anahtar Kelimeler |
| Makale Türü | Özgün Makale |
| Makale Alt Türü | SSCI, AHCI, SCI, SCI-Exp dergilerinde yayımlanan tam makale |
| Dergi Adı | Macromolecules |
| Dergi ISSN | 0024-9297 |
| Dergi Tarandığı Indeksler | SSCI |
| Makale Dili | İngilizce |
| Basım Tarihi | 09-2010 |
| Cilt No | 43 |
| Sayı | 17 |
| Sayfalar | 7282 / 7287 |
| Doi Numarası | 10.1021/ma1012489 |
| Makale Linki | http://pubs.acs.org/doi/abs/10.1021/ma1012489 |
| Atıf Sayıları | |
| SCOPUS | 35 |
| Google Scholar | 38 |
