Water at interfaces and its influence on the electrical properties of adsorbed films
Autor(a) principal: | |
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Data de Publicação: | 2004 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S0103-97332004000100011 http://hdl.handle.net/11449/29737 |
Resumo: | This paper discusses water at interfaces with emphasis on the electrical properties of adsorbed films. Two issues are addressed, namely adsorption of organic molecules at the air/water interface in Langmuir monolayers and the influence of adsorbed water on the electrical properties of nanostructured organic films deposited onto solid substrates. In Langmuir monolayers the focus will be on the interaction of the adsorbed molecules with the underlying water, particularly with regard to the surface potential and lateral conductance of the monolayers. It will be shown that these electrical measurements are extremely sensitive to small changes in the subphase, including trace amounts of impurities. Phase transitions due to structuring of the monolayer will be discussed at the light of theoretical models that deal with proton transfer along the monolayers. Attempts will be made to connect the interpretation at the molecular level with experimental findings from techniques such as Brewster angle microscopy and fluorescence microscopy, which provide information at the mesoscopic or microscopic scale. The gradient of the dielectric constant for water at the monolayer interface is inferred from modeling the monolayer surface potential in terms of the dipole moments of the molecules. For deposited films, the discussion will be centered on the electrical properties of nanostructured films produced with either the Langmuir-Blodgett (LB) or the layer-by-layer (LBL) methods. The strong effects from adsorbed water will be presented, with mention to sensor applications where the extreme sensitivity of the electrical properties to water is exploited and to doping of a conducting polymer induced by X-ray irradiation. |
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Repositório Institucional da UNESP |
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spelling |
Water at interfaces and its influence on the electrical properties of adsorbed filmsThis paper discusses water at interfaces with emphasis on the electrical properties of adsorbed films. Two issues are addressed, namely adsorption of organic molecules at the air/water interface in Langmuir monolayers and the influence of adsorbed water on the electrical properties of nanostructured organic films deposited onto solid substrates. In Langmuir monolayers the focus will be on the interaction of the adsorbed molecules with the underlying water, particularly with regard to the surface potential and lateral conductance of the monolayers. It will be shown that these electrical measurements are extremely sensitive to small changes in the subphase, including trace amounts of impurities. Phase transitions due to structuring of the monolayer will be discussed at the light of theoretical models that deal with proton transfer along the monolayers. Attempts will be made to connect the interpretation at the molecular level with experimental findings from techniques such as Brewster angle microscopy and fluorescence microscopy, which provide information at the mesoscopic or microscopic scale. The gradient of the dielectric constant for water at the monolayer interface is inferred from modeling the monolayer surface potential in terms of the dipole moments of the molecules. For deposited films, the discussion will be centered on the electrical properties of nanostructured films produced with either the Langmuir-Blodgett (LB) or the layer-by-layer (LBL) methods. The strong effects from adsorbed water will be presented, with mention to sensor applications where the extreme sensitivity of the electrical properties to water is exploited and to doping of a conducting polymer induced by X-ray irradiation.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)USP Instituto de Física de São CarlosUNESP FCT Departamento de Física, Química e BiologiaUniversidade Estadual Paulista IBILCE Departamento de FísicaUNESP FCT Departamento de Física, Química e BiologiaUniversidade Estadual Paulista IBILCE Departamento de FísicaSociedade Brasileira de FísicaUniversidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Oliveira Jr., Osvaldo N.Riul Jr., Antonio [UNESP]Leite, Vitor Barbanti Pereira [UNESP]2014-05-20T15:15:40Z2014-05-20T15:15:40Z2004-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article73-83application/pdfhttp://dx.doi.org/10.1590/S0103-97332004000100011Brazilian Journal of Physics. Sociedade Brasileira de Física, v. 34, n. 1, p. 73-83, 2004.0103-9733http://hdl.handle.net/11449/2973710.1590/S0103-97332004000100011S0103-97332004000100011S0103-97332004000100011.pdf0500034174785796SciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBrazilian Journal of Physics1.0820,276info:eu-repo/semantics/openAccess2024-06-19T12:44:51Zoai:repositorio.unesp.br:11449/29737Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:23:53.307685Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Water at interfaces and its influence on the electrical properties of adsorbed films |
title |
Water at interfaces and its influence on the electrical properties of adsorbed films |
spellingShingle |
Water at interfaces and its influence on the electrical properties of adsorbed films Oliveira Jr., Osvaldo N. |
title_short |
Water at interfaces and its influence on the electrical properties of adsorbed films |
title_full |
Water at interfaces and its influence on the electrical properties of adsorbed films |
title_fullStr |
Water at interfaces and its influence on the electrical properties of adsorbed films |
title_full_unstemmed |
Water at interfaces and its influence on the electrical properties of adsorbed films |
title_sort |
Water at interfaces and its influence on the electrical properties of adsorbed films |
author |
Oliveira Jr., Osvaldo N. |
author_facet |
Oliveira Jr., Osvaldo N. Riul Jr., Antonio [UNESP] Leite, Vitor Barbanti Pereira [UNESP] |
author_role |
author |
author2 |
Riul Jr., Antonio [UNESP] Leite, Vitor Barbanti Pereira [UNESP] |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Oliveira Jr., Osvaldo N. Riul Jr., Antonio [UNESP] Leite, Vitor Barbanti Pereira [UNESP] |
description |
This paper discusses water at interfaces with emphasis on the electrical properties of adsorbed films. Two issues are addressed, namely adsorption of organic molecules at the air/water interface in Langmuir monolayers and the influence of adsorbed water on the electrical properties of nanostructured organic films deposited onto solid substrates. In Langmuir monolayers the focus will be on the interaction of the adsorbed molecules with the underlying water, particularly with regard to the surface potential and lateral conductance of the monolayers. It will be shown that these electrical measurements are extremely sensitive to small changes in the subphase, including trace amounts of impurities. Phase transitions due to structuring of the monolayer will be discussed at the light of theoretical models that deal with proton transfer along the monolayers. Attempts will be made to connect the interpretation at the molecular level with experimental findings from techniques such as Brewster angle microscopy and fluorescence microscopy, which provide information at the mesoscopic or microscopic scale. The gradient of the dielectric constant for water at the monolayer interface is inferred from modeling the monolayer surface potential in terms of the dipole moments of the molecules. For deposited films, the discussion will be centered on the electrical properties of nanostructured films produced with either the Langmuir-Blodgett (LB) or the layer-by-layer (LBL) methods. The strong effects from adsorbed water will be presented, with mention to sensor applications where the extreme sensitivity of the electrical properties to water is exploited and to doping of a conducting polymer induced by X-ray irradiation. |
publishDate |
2004 |
dc.date.none.fl_str_mv |
2004-03-01 2014-05-20T15:15:40Z 2014-05-20T15:15:40Z |
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/10.1590/S0103-97332004000100011 Brazilian Journal of Physics. Sociedade Brasileira de Física, v. 34, n. 1, p. 73-83, 2004. 0103-9733 http://hdl.handle.net/11449/29737 10.1590/S0103-97332004000100011 S0103-97332004000100011 S0103-97332004000100011.pdf 0500034174785796 |
url |
http://dx.doi.org/10.1590/S0103-97332004000100011 http://hdl.handle.net/11449/29737 |
identifier_str_mv |
Brazilian Journal of Physics. Sociedade Brasileira de Física, v. 34, n. 1, p. 73-83, 2004. 0103-9733 10.1590/S0103-97332004000100011 S0103-97332004000100011 S0103-97332004000100011.pdf 0500034174785796 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Brazilian Journal of Physics 1.082 0,276 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
73-83 application/pdf |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
dc.source.none.fl_str_mv |
SciELO 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_ |
1808129516615237632 |