Electrochemical functionalisation of SWNTs with poly(3,4‐ethylenedioxythiophene) evidenced by anti‐Stokes/Stokes Raman spectroscopy
Identifieur interne : 000027 ( France/Analysis ); précédent : 000026; suivant : 000028Electrochemical functionalisation of SWNTs with poly(3,4‐ethylenedioxythiophene) evidenced by anti‐Stokes/Stokes Raman spectroscopy
Auteurs : Ioan Baltog [Roumanie] ; Mihaela Baibarac [Roumanie] ; Serge Lefrant [France] ; Jean Yves Mevellec [France]Source :
- Journal of Raman Spectroscopy [ 0377-0486 ] ; 2011-03.
English descriptors
Abstract
The capability of anti‐Stokes/Stokes Raman spectroscopy to evaluate chemical interactions at the interface of a conducting polymer/carbon nanotubes is demonstrated. Electrochemical polymerisation of the monomer 3,4‐ethylenedioxythiophene (EDOT) on a Au support covered with a single‐walled carbon nanotube (SWNT) film immersed in a LiClO4/CH3CN solution was carried out. At the resonant optical excitation, which occurs when the energy of the exciting light coincides with the energy of an electronic transition, poly(3,4‐ethylenedioxythiophene) (PEDOT) deposited electrochemically as a thin film of nanometric thickness on a rough Au support presents an abnormally intense anti‐Stokes Raman spectrum. The additional increase in Raman intensity in the anti‐Stokes branch observed when PEDOT is deposited on SWNTs is interpreted as resulting from the excitation of plasmons in the metallic nanotubes. A covalent functionalisation of SWNTs with PEDOT both in un‐doped and doped states takes place when the electropolymerisation of EDOT, with stopping at +1.6 V versus Ag/Ag+, is performed on a SWNT film deposited on a Au plate. The presence of PEDOT covalently functionalised SWNTs is rationalised by (1) a downshift by a few wavenumbers of the polymer Raman line associated with the symmetric CC stretching mode and (2) an upshift of the radial breathing modes of SWNTs, both variations revealing an interaction between SWNTs and the conjugated polymer. Raman studies performed at different excitation wavelengths indicate that the resonant optical excitation is the key condition to observe the abnormal anti‐Stokes Raman effect. Copyright © 2010 John Wiley & Sons, Ltd.
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DOI: 10.1002/jrs.2705
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Box MEG‐7, Bucharest R‐77125</wicri:regionArea><wicri:noRegion>Bucharest R‐77125</wicri:noRegion></affiliation></author><author><name sortKey="Baibarac, Mihaela" sort="Baibarac, Mihaela" uniqKey="Baibarac M" first="Mihaela" last="Baibarac">Mihaela Baibarac</name><affiliation wicri:level="1"><country xml:lang="fr">Roumanie</country><wicri:regionArea>Laboratory of Optics and Spectroscopy, National Institute of Materials Physics, P.O. Box MEG‐7, Bucharest R‐77125</wicri:regionArea><wicri:noRegion>Bucharest R‐77125</wicri:noRegion></affiliation></author><author><name sortKey="Lefrant, Serge" sort="Lefrant, Serge" uniqKey="Lefrant S" first="Serge" last="Lefrant">Serge Lefrant</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Institut des Materiaux ‘Jean Rouxel’, 2 rue de la Houssinière, B.P. 32229, F‐44322 Nantes</wicri:regionArea><placeName><region type="region" nuts="2">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName></affiliation></author><author><name sortKey="Mevellec, Jean Yves" sort="Mevellec, Jean Yves" uniqKey="Mevellec J" first="Jean Yves" last="Mevellec">Jean Yves Mevellec</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Institut des Materiaux ‘Jean Rouxel’, 2 rue de la Houssinière, B.P. 32229, F‐44322 Nantes</wicri:regionArea><placeName><region type="region" nuts="2">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Raman Spectroscopy</title><title level="j" type="abbrev">J. Raman Spectrosc.</title><idno type="ISSN">0377-0486</idno><idno type="eISSN">1097-4555</idno><imprint><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><date type="published" when="2011-03">2011-03</date><biblScope unit="volume">42</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="303">303</biblScope><biblScope unit="page" to="312">312</biblScope></imprint><idno type="ISSN">0377-0486</idno></series><idno type="istex">DCB3C3B1A2218D945ADA0C8E807FC37B18B73EAF</idno><idno type="DOI">10.1002/jrs.2705</idno><idno type="ArticleID">JRS2705</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0377-0486</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Raman anti‐Stokes</term><term>carbon nanotubes</term><term>composites</term><term>surface‐enhanced Raman scattering (SERS)</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The capability of anti‐Stokes/Stokes Raman spectroscopy to evaluate chemical interactions at the interface of a conducting polymer/carbon nanotubes is demonstrated. Electrochemical polymerisation of the monomer 3,4‐ethylenedioxythiophene (EDOT) on a Au support covered with a single‐walled carbon nanotube (SWNT) film immersed in a LiClO4/CH3CN solution was carried out. At the resonant optical excitation, which occurs when the energy of the exciting light coincides with the energy of an electronic transition, poly(3,4‐ethylenedioxythiophene) (PEDOT) deposited electrochemically as a thin film of nanometric thickness on a rough Au support presents an abnormally intense anti‐Stokes Raman spectrum. The additional increase in Raman intensity in the anti‐Stokes branch observed when PEDOT is deposited on SWNTs is interpreted as resulting from the excitation of plasmons in the metallic nanotubes. A covalent functionalisation of SWNTs with PEDOT both in un‐doped and doped states takes place when the electropolymerisation of EDOT, with stopping at +1.6 V versus Ag/Ag+, is performed on a SWNT film deposited on a Au plate. The presence of PEDOT covalently functionalised SWNTs is rationalised by (1) a downshift by a few wavenumbers of the polymer Raman line associated with the symmetric CC stretching mode and (2) an upshift of the radial breathing modes of SWNTs, both variations revealing an interaction between SWNTs and the conjugated polymer. Raman studies performed at different excitation wavelengths indicate that the resonant optical excitation is the key condition to observe the abnormal anti‐Stokes Raman effect. Copyright © 2010 John Wiley & Sons, Ltd.</div></front></TEI><affiliations><list><country><li>France</li><li>Roumanie</li></country><region><li>Pays de la Loire</li></region><settlement><li>Nantes</li></settlement></list><tree><country name="Roumanie"><noRegion><name sortKey="Baltog, Ioan" sort="Baltog, Ioan" uniqKey="Baltog I" first="Ioan" last="Baltog">Ioan Baltog</name></noRegion><name sortKey="Baibarac, Mihaela" sort="Baibarac, Mihaela" uniqKey="Baibarac M" first="Mihaela" last="Baibarac">Mihaela Baibarac</name></country><country name="France"><region name="Pays de la Loire"><name sortKey="Lefrant, Serge" sort="Lefrant, Serge" uniqKey="Lefrant S" first="Serge" last="Lefrant">Serge Lefrant</name></region><name sortKey="Mevellec, Jean Yves" sort="Mevellec, Jean Yves" uniqKey="Mevellec J" first="Jean Yves" last="Mevellec">Jean Yves Mevellec</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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