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.
Bibliographical noteFunding Information:
This work was performed within the EU RT network CassiusClays Contract No. HPRN-CT-2002-00178 and received additional support from the Dutch Foundation for Fundamental Research on Matter (FOM), the University of Trieste, INSTM, Italian Ministry of Education MIUR (cofin Prot. 20085M27SS and Firb RBIN04HC3S), and the General Secretariat of Research and Technology of Greece through the PENED 2003 program ( 03ED 548 ). AMA acknowledges support of the Deutsche Forschungsgemeinschaft ( MA 5215/4-1 ), POLYMAT (Basque Excellence Research Center) , the Basque Science Foundation for Science (Ikerbasque) , and Diputacion de Guipuzkoa .