Exploiting Distinct Molecular Architectures of Ultrathin Films Made with Iron Phthalocyanine for Sensing

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dc.contributor.authorVolpati, D. [UNESP]
dc.contributor.authorAlessio, P. [UNESP]
dc.contributor.authorZanfolim, A. A. [UNESP]
dc.contributor.authorStorti, F. C. [UNESP]
dc.contributor.authorJob, Aldo Eloizo [UNESP]
dc.contributor.authorFerreira, M.
dc.contributor.authorRiul, A.
dc.contributor.authorOliveira, O. N.
dc.contributor.authorConstantino, C. J. L. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T13:23:13Z
dc.date.available2014-05-20T13:23:13Z
dc.date.issued2008-12-04
dc.description.abstractThe possibility of generating distinct film properties from the same material is crucial for a number of applications, which can only be achieved by controlling the molecular architecture. In this paper we demonstrate as a proof-of-principle that ultrathin films produced from iron phthalocyanine (FePc) may be used to detect trace amounts of copper ions in water, where advantage was taken of the cross sensitivity of the sensing units that displayed distinct electrical properties. The ultrathin films were fabricated with three methods, namely physical vapor deposition (PVD), Langmuir-Blodgett (LB), and electrostatic layer-by-layer (LbL) techniques, where for the latter tetrasulfonated phthalocyanine was used (FeTsPc). PVD and LB films were more homogeneous than the LbL films at both microscopic and nanoscopic scales, according to results from micro-Raman spectroscopy and atomic force microscopy (AFM), respectively. From FTIR spectroscopy data, these more homogeneous films were found to have FePc molecules oriented preferentially, tilted in relation to the substrate surface, while FeTsPc molecules were isotropically distributed in the LbL films. Impedance spectroscopy measurements with films adsorbed onto interdigitated gold electrodes indicated that the electrical response depends on the type of film-forming method and varies with incorporation of copper ions in aqueous solutions. Using principal component analysis (PCA), we were able to exploit the cross sensitivity of the sensing units and detect copper ions (Cu(2+)) down to 0.2 mg/L, not only in ultrapure water but also in distilled and tap water. This level of sensitivity is sufficient for quality control of water for human consumption, with a fast, low-cost method.en
dc.description.affiliationUNESP, FCT, DFQB, BR-19060900 Presidente Prudente, SP, Brazil
dc.description.affiliationUniversidade Federal de São Carlos (UFSCar), BR-18043970 Campus Sorocaba, SP, Brazil
dc.description.affiliationUSP, Inst Fis São Carlos, BR-13560970 São Carlos, SP, Brazil
dc.description.affiliationUnespUNESP, FCT, DFQB, BR-19060900 Presidente Prudente, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.format.extent15275-15282
dc.identifierhttp://dx.doi.org/10.1021/jp804159h
dc.identifier.citationJournal of Physical Chemistry B. Washington: Amer Chemical Soc, v. 112, n. 48, p. 15275-15282, 2008.
dc.identifier.doi10.1021/jp804159h
dc.identifier.issn1520-6106
dc.identifier.lattes6475585105456744
dc.identifier.lattes9727122203219263
dc.identifier.orcid0000-0002-1345-0540
dc.identifier.urihttp://hdl.handle.net/11449/6965
dc.identifier.wosWOS:000261218200004
dc.language.isoeng
dc.publisherAmer Chemical Soc
dc.relation.ispartofJournal of Physical Chemistry B
dc.relation.ispartofjcr3.146
dc.relation.ispartofsjr1,331
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleExploiting Distinct Molecular Architectures of Ultrathin Films Made with Iron Phthalocyanine for Sensingen
dc.typeArtigo
dcterms.licensehttp://pubs.acs.org/page/copyright/journals/faqs.html
dcterms.rightsHolderAmer Chemical Soc
unesp.author.lattes6475585105456744[5]
unesp.author.lattes9727122203219263[2]
unesp.author.lattes6118325967319836[9]
unesp.author.orcid0000-0003-4370-5492[1]
unesp.author.orcid0000-0002-1345-0540[2]
unesp.author.orcid0000-0002-9760-1851[7]
unesp.author.orcid0000-0002-1979-8257[5]
unesp.author.orcid0000-0002-9459-8167[6]
unesp.author.orcid0000-0002-5399-5860[8]
unesp.author.orcid0000-0002-5921-3161[9]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências e Tecnologia, Presidente Prudentept

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Artigos - Física, Química e Biologia - FCT