Covalent assembly and micropatterning of functionalized multiwalled carbon nanotubes to monolayer-modified Si(111) surfaces.
Multiwalled carbon nanotubes (MWNTs) covalently bound to monocrystalline p-type Si(111) surfaces have been prepared by attaching soluble amine-functionalized MWNTs onto a preassembled undecanoic acid monolayer using carbodiimide coupling. SEM analysis of these functionalized surfaces shows that the bound MWNTs are parallel to the surface rather than perpendicular. The voltammetric and electrochemical impedance spectroscopy measurements reveal that the electron transfer at the MWNT-modified surface is faster than that observed at a MWNT-free alkyl monolayer. We have also demonstrated that it is possible to prepare MWNT micropatterns using this surface amidation reaction and a "reagentless" UV photolithography technique. Following this approach, MWNT patterns surrounded by n-dodecyl areas have been produced and the local electrochemical properties of these micropatterned surfaces have been examined by scanning electrochemical microscopy. In particular, it is demonstrated that the MWNT patterns allow a faster charge transfer which is consistent with the results obtained for the uniformly modified surfaces.
Université de Rennes 1 and CNRS UMR 6226 Sciences Chimiques de Rennes, Matière Condensée et Systèmes Electroactifs MaCSE, Campus de Beaulieu, 35042 Rennes Cedex, France. fabre@univ-rennes1.fr
Bruno
B
Fabre
Fanny
F
Hauquier
Cyril
C
Herrier
Giorgia
G
Pastorin
Wei
W
Wu
Alberto
A
Bianco
Maurizio
M
Prato
Philippe
P
Hapiot
Dodzi
D
Zigah
Mauro
M
Prasciolu
Lisa
L
Vaccari
D004563:Electrochemistry; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D012825:Silicon / Q000737:chemistry*; D013499:Surface Properties
D037742:Nanotubes, Carbon; D012825:Silicon