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High-frequency dielectric response of polyaniline pellets as nanocomposites of metallic emeraldine salt and dielectric base
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SYSNO ASEP 0448157 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název High-frequency dielectric response of polyaniline pellets as nanocomposites of metallic emeraldine salt and dielectric base Tvůrce(i) Nuzhnyy, Dmitry (FZU-D) RID, ORCID
Petzelt, Jan (FZU-D) RID, ORCID, SAI
Rychetský, Ivan (FZU-D) RID, ORCID
Trchová, Miroslava (UMCH-V) RID, ORCID
Stejskal, Jaroslav (UMCH-V) RID, ORCID, SAIZdroj.dok. Synthetic Metals. - : Elsevier - ISSN 0379-6779
Roč. 209, Nov (2015), s. 561-569Poč.str. 9 s. Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova polyaniline ; infrared and THz spectroscopy ; optical conductivity ; dielectric permittivity ; vibrational mode ; effective medium approach Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GAP204/12/0232 GA ČR - Grantová agentura ČR GAP205/12/0911 GA ČR - Grantová agentura ČR Institucionální podpora FZU-D - RVO:68378271 ; UMCH-V - RVO:61389013 UT WOS 000364245900081 EID SCOPUS 84942474889 DOI 10.1016/j.synthmet.2015.09.002 Anotace Conducting polyaniline (PANI) salt and dielectric PANI base pellets were studied in the infrared (IR) and terahertz (THz) range at room temperature and compared with the IR transmission spectra of powdered samples dispersed in potassium bromide and with those of thin films. The IR reflectivity combined with THz transmission was fitted to calculate the permittivity and IR conductivity spectra. Good agreement between the IR conductivity peaks and those from the absorbance evaluated from the transmission measurements was obtained and differences between the spectra of PANI salt and base are discussed. The dielectric and conductivity spectra of PANI salt were modeled as the spectra of a composite of PANI base and metallic PANI. Effective medium approach using three different models was applied and discussed. The best results, including the semiconductor-like temperature dependence of the low-frequency conductivity, were obtained with the generalized Lichtenecker model. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2016
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