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Titolo:
Development and application of patterned conducting polymer thin films as chemoresponsive and electrochemically responsive optical diffraction gratings
Autore:
Massari, AM; Stevenson, KJ; Hupp, JT;
Indirizzi:
Northwestern Univ, Dept Chem, Evanston, IL 60208 USA Northwestern Univ Evanston IL USA 60208 Dept Chem, Evanston, IL 60208 USA Northwestern Univ, Mat Res Ctr, Evanston, IL 60208 USA Northwestern Univ Evanston IL USA 60208 t Res Ctr, Evanston, IL 60208 USA
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1-2, volume: 500, anno: 2001,
pagine: 185 - 191
Fonte:
ISI
Lingua:
ENG
Soggetto:
VOLTAMMETRIC DETERMINATION; CHEMICAL SENSORS; POLYANILINE; MICROELECTRODES; FABRICATION; SURFACES; STATE; GLASS; NO2;
Keywords:
optical diffraction gratings; electrochemical sensors; polyaniline;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Hupp, JT Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA Northwestern Univ 2145 Sheridan Rd Evanston IL USA 60208 0208 USA
Citazione:
A.M. Massari et al., "Development and application of patterned conducting polymer thin films as chemoresponsive and electrochemically responsive optical diffraction gratings", J ELEC CHEM, 500(1-2), 2001, pp. 185-191

Abstract

We describe the preparation of two-dimensionally patterned polyaniline (PANI) thin films via microtransfer molding and electropolymerization techniques. This procedure yields reproducible conducting polymer patterns with excellent feature periodicity, making them useful as diffraction gratings. Thefabricated polymer gratings were characterized via tapping-mode atomic force microscopy. Spectroelectrochemistry was used to characterize the opticalproperties associated with various intrinsic PANI redox states. In accordance with the Kramers-Kronig relation for change-in-absorptivity and change-in-index-of-refraction, electrochemically induced changes in refractive index (detected via changes in diffraction efficiency) were observed to coincide with electrochemically-induced changes in the PANI electronic absorptionspectrum. In addition, the higher oxidation states of PANI and the associated changes in refractive index proved accessible via chemical oxidation. Beyond the novelty of a chemically-switchable transmission grating, the response of this system points to the possibility of developing diffraction-based chemical sensing schemes. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 29/09/20 alle ore 10:07:07