Charge Transfer Evidence between Carbon Nanotubes and Encapsulated Conjugated Oligomers

Alvarez, Laurent and Almadouri, Yan and Arenal, Raoul and Babaa, Moualy Rachid and Michel, Theiry and Le Park, Rozen and Bantignies, Jean-Louis and Jousselme, Bruno and Hermet, P and Palacin, Serge and Sauvajol, Jean-Louis (2011) Charge Transfer Evidence between Carbon Nanotubes and Encapsulated Conjugated Oligomers. Journal of Physical Chemistry C, 115. pp. 11898-11905. ISSN Print Edition ISSN: 1932-7447, Web Edition ISSN: 1932-7455. 2010 Impact Factor: 4.520

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A hybrid system consisting of quaterthiophene derivative inserted
into carbon nanotubes is studied. Encapsulation efficiency of the conjugated
oligomers in the hollow core of nanotubes is investigated by transmission
electron microscopy and spatial-resolved electron energy loss spectroscopy.
Infrared spectroscopy showed evidence of a significant positive charge transfer
on the inserted oligothiophene. Raman spectra display different behaviors
depending on the excitation energy and correlated to the quaterthiophene
optical absorption energy. At high excitation wavelength (far from the oligomer
resonance), radial breathing modes exhibit a significant upshift consistent with
an encapsulation effect. At low excitation wavelength (close to the oligomer
resonance), both the G-band shift and the low-frequency modes vanishing
suggest a significant charge transfer between the quaterthiophene and the

Item Type: Article
Subjects: Q Science > QD Chemistry
Q Science > QC Physics
Departments / MOR / COE: Departments > Chemical Engineering
Depositing User: Dr Moulay Rachid Babaa
Date Deposited: 02 Aug 2011 04:03
Last Modified: 02 Aug 2011 04:03

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