Photopyroelectric spectroscopy of polyaniline films
Autor(a) principal: | |
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Data de Publicação: | 2000 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1002/(SICI)1099-0488(20000515)38:10<1294 http://hdl.handle.net/11449/224166 |
Resumo: | Photopyroelectric spectroscopy (PPES), in the 400<λ<900 nm wavelength range, was used to study thermal properties of differently doped polyaniline (PAN) films. The photopyroelectric intensity signal Vn(λ) and its phase Fn(λ) were independently measured, as well as the intensity Vn(f) and the phase Fn(f) (f being the chopping frequency) for a given λ of the saturation part of the PPES spectrum. Equations of both the intensity and the phase of the PPES signal, taking into account the thermal and the optical characteristics of the PAN films and the pyroelectric detector, were used to fit the experimental results. From the fittings we obtained, with great accuracy, the values of thermal conductivity κ and thermal diffusivity coefficient α of PAN films of different doping degrees. It was observed that, in contrast with the strong doping-dependence of the electrical conductivity, the thermal parameters of PAN films remained practically unchanged under doping. This apparent discrepancy is explained by the granular metal model of doped PAN. |
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Repositório Institucional da UNESP |
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Photopyroelectric spectroscopy of polyaniline filmsPhotopyroelectric spectroscopy (PPES), in the 400<λ<900 nm wavelength range, was used to study thermal properties of differently doped polyaniline (PAN) films. The photopyroelectric intensity signal Vn(λ) and its phase Fn(λ) were independently measured, as well as the intensity Vn(f) and the phase Fn(f) (f being the chopping frequency) for a given λ of the saturation part of the PPES spectrum. Equations of both the intensity and the phase of the PPES signal, taking into account the thermal and the optical characteristics of the PAN films and the pyroelectric detector, were used to fit the experimental results. From the fittings we obtained, with great accuracy, the values of thermal conductivity κ and thermal diffusivity coefficient α of PAN films of different doping degrees. It was observed that, in contrast with the strong doping-dependence of the electrical conductivity, the thermal parameters of PAN films remained practically unchanged under doping. This apparent discrepancy is explained by the granular metal model of doped PAN.Inst. de Fis. de São Carlos Universidade de São Paulo, C.P. 369, 13560-270 São CarlosDepto. de Engenharia Elétrica UNESP, 15378-000 Ilha SolteiraDepartamento de Física Univ. Federal de Viçosa, 36571-000, Viçosa, MGDepto. de Engenharia Elétrica UNESP, 15378-000 Ilha SolteiraUniversidade de São Paulo (USP)Universidade Estadual Paulista (UNESP)Universidade Federal de Viçosa (UFV)De Albuquerque, J. E.Melo, W. L.B. [UNESP]Faria, R. M.2022-04-28T19:54:59Z2022-04-28T19:54:59Z2000-05-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1294-1300http://dx.doi.org/10.1002/(SICI)1099-0488(20000515)38:10<1294Journal of Polymer Science, Part B: Polymer Physics, v. 38, n. 10, p. 1294-1300, 2000.0887-6266http://hdl.handle.net/11449/22416610.1002/(SICI)1099-0488(20000515)38:10<12942-s2.0-0034187684Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Polymer Science, Part B: Polymer Physicsinfo:eu-repo/semantics/openAccess2022-04-28T19:55:00Zoai:repositorio.unesp.br:11449/224166Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-04-28T19:55Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Photopyroelectric spectroscopy of polyaniline films |
title |
Photopyroelectric spectroscopy of polyaniline films |
spellingShingle |
Photopyroelectric spectroscopy of polyaniline films De Albuquerque, J. E. |
title_short |
Photopyroelectric spectroscopy of polyaniline films |
title_full |
Photopyroelectric spectroscopy of polyaniline films |
title_fullStr |
Photopyroelectric spectroscopy of polyaniline films |
title_full_unstemmed |
Photopyroelectric spectroscopy of polyaniline films |
title_sort |
Photopyroelectric spectroscopy of polyaniline films |
author |
De Albuquerque, J. E. |
author_facet |
De Albuquerque, J. E. Melo, W. L.B. [UNESP] Faria, R. M. |
author_role |
author |
author2 |
Melo, W. L.B. [UNESP] Faria, R. M. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (UNESP) Universidade Federal de Viçosa (UFV) |
dc.contributor.author.fl_str_mv |
De Albuquerque, J. E. Melo, W. L.B. [UNESP] Faria, R. M. |
description |
Photopyroelectric spectroscopy (PPES), in the 400<λ<900 nm wavelength range, was used to study thermal properties of differently doped polyaniline (PAN) films. The photopyroelectric intensity signal Vn(λ) and its phase Fn(λ) were independently measured, as well as the intensity Vn(f) and the phase Fn(f) (f being the chopping frequency) for a given λ of the saturation part of the PPES spectrum. Equations of both the intensity and the phase of the PPES signal, taking into account the thermal and the optical characteristics of the PAN films and the pyroelectric detector, were used to fit the experimental results. From the fittings we obtained, with great accuracy, the values of thermal conductivity κ and thermal diffusivity coefficient α of PAN films of different doping degrees. It was observed that, in contrast with the strong doping-dependence of the electrical conductivity, the thermal parameters of PAN films remained practically unchanged under doping. This apparent discrepancy is explained by the granular metal model of doped PAN. |
publishDate |
2000 |
dc.date.none.fl_str_mv |
2000-05-15 2022-04-28T19:54:59Z 2022-04-28T19:54:59Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1002/(SICI)1099-0488(20000515)38:10<1294 Journal of Polymer Science, Part B: Polymer Physics, v. 38, n. 10, p. 1294-1300, 2000. 0887-6266 http://hdl.handle.net/11449/224166 10.1002/(SICI)1099-0488(20000515)38:10<1294 2-s2.0-0034187684 |
url |
http://dx.doi.org/10.1002/(SICI)1099-0488(20000515)38:10<1294 http://hdl.handle.net/11449/224166 |
identifier_str_mv |
Journal of Polymer Science, Part B: Polymer Physics, v. 38, n. 10, p. 1294-1300, 2000. 0887-6266 10.1002/(SICI)1099-0488(20000515)38:10<1294 2-s2.0-0034187684 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Polymer Science, Part B: Polymer Physics |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
1294-1300 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799964907931697152 |