Direct observation of spin-injection in tyrosinate-functionalized single-wall carbon nanotubes

In this work, we report on the interaction of a tyrosinate radical with single wall carbon nanotubes (CNT). The tyrosinate radical was formed from tyrosine (ester) by Fenton’s reagent and, reacted in situ with carbon nanotubes resulting in novel tyrosinated carbon nanotube derivatives. The covalent...

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Bibliographic Details
Published in:	Carbon (New York) Vol. 67; pp. 424 - 433
Main Authors:	Tsoufis, Theodoros, Ampoumogli, Asem, Gournis, Dimitrios, Georgakilas, Vasilios, Jankovic, Lubos, Christoforidis, Konstantinos C., Deligiannakis, Yiannis, Mavrandonakis, Andreas, Froudakis, George E., Maccallini, Enrico, Rudolf, Petra, Mateo-Alonso, Aurelio, Prato, Maurizio
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-02-2014 Elsevier
Subjects:	Carbon nanotubes Condensed matter: electronic structure, electrical, magnetic, and optical properties Covalence Cross-disciplinary physics: materials science; rheology Derivatives Electronic transport in condensed matter Esters Exact sciences and technology Free radicals Fullerenes and related materials; diamonds, graphite Materials science Nanoscale materials and structures: fabrication and characterization Nanotubes Physics Radicals Single wall carbon nanotubes Specific materials Spin polarized transport Tyrosine Carbon nanotubes Chemical modification Singlewalled nanotube Spin injection Spin Carbon
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Summary:	In this work, we report on the interaction of a tyrosinate radical with single wall carbon nanotubes (CNT). The tyrosinate radical was formed from tyrosine (ester) by Fenton’s reagent and, reacted in situ with carbon nanotubes resulting in novel tyrosinated carbon nanotube derivatives. The covalent attachment of tyrosine on the external surface of the CNTs resulted in the appearance of a free radical, localized in the graphitic surface. The ‘electron injection’ (delocalization) of the free radical from the tyrosine ring onto the carbon nanotubes was studied and characterized by a combination of electron paramagnetic resonance, Raman and X-ray photoelectron spectroscopies, thermogravimetric analysis, as well as transmission electron and atomic force microscopies. The experiments, complemented by computer simulations, give insight into the formation process and structural details of the produced hybrid structures.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0008-6223 1873-3891
DOI:	10.1016/j.carbon.2013.10.014