Adsorption of C60 buckminster fullerenes on an 11-amino-1-undecene-covered Si(111) substrate.
Buckminster fullerene C60 was used as a model to understand the attachment chemistry of large molecules on amine-terminated self-assembled monolayers (SAM) on semiconductor substrates. This type of interface serves as a prototype for future devices in such fields as solar energy conversion, biosensing, catalysis, and molecular electronics. Fullerene C60 was attached to 11-amino-1-undecene self-assembled monolayers on a Si(111) surface. The chemical state and topography of the C60-modified surface were characterized by surface analytical spectroscopic and microscopic methods and by computational investigation. X-ray photoelectron spectroscopy revealed that the secondary amine group is formed between the C60 and the 11-amino-1-undecene SAM on the surface. The appearance of the pi-pi* C 1s shakeup peak confirmed the presence of C60 on the surface. Infrared spectroscopic studies verified several characteristic features of the C60 skeleton vibration and the 11-amino-1-undecene vibrational signature. The atomic force microscopy investigation suggested that the fullerene molecules produce surface features with an apparent height of approximately 2 nm and an average width of approximately 20 nm. A parallel study was performed on a Au(111) surface for comparison with the results obtained on the silicon substrate. The reaction between fullerene molecules and approximately 1% 11-amino-1-undecene diluted in decene SAM on the Si(111) surface accordingly yielded dilute and uniformly distributed C60 molecules on the surface, which indicated that the amine groups were the reactive sites.
Zhang
Xiaochun
X
Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
Teplyakov
Andrew V
AV
D000327:Adsorption; D001665:Binding Sites; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D037741:Fullerenes / Q000737:chemistry*; D008422:Materials Testing; D018625:Microscopy, Atomic Force; D008958:Models, Molecular; D012666:Semiconductors; D012825:Silicon; D017550:Spectroscopy, Fourier Transform Infrared; D013057:Spectrum Analysis; D013499:Surface Properties; D014965:X-Rays
D020099:Coated Materials, Biocompatible; D037741:Fullerenes; C069837:fullerene C60; D012825:Silicon