Research Article


2011, 4(2): 194–203


Self-Assembly and Ordering of C60 on the WO2/W(110) Surface

Sergey A. Krasnikov1 (), Sergey I. Bozhko1, 2, Kevin Radican1, Olaf Lübben1, Barry E. Murphy1, Sundar-Raja Vadapoo1, Han-Chun Wu1, Mohamed Abid1, 3, Valery N. Semenov2, and Igor V. Shvets1

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1 Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), School of Physics, Trinity College Dublin, Dublin 2, Ireland
2 Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Russian Federation
3 King Abdullah Institute for Nanotechnology, College of Science King Saud University, Riyadh 11451, Saudi Arabia

Keywords: Fullerenes, self-assembly, tungsten oxide, low-temperature scanning tunnelling microscopy, scanning tunnelling spectroscopy, W(110)
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  • Abstract
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The growth and ordering of C60 molecules on the WO2/W(110) surface have been studied by low-temperature scanning tunnelling microscopy and spectroscopy (STM and STS), low-energy electron diffraction (LEED), and density functional theory (DFT) calculations. The results indicate the growth of a well-ordered C60 layer on the WO2/W(110) surface in which the molecules form a close-packed hexagonal structure with a unit cell parameter equal to 0.95 nm. The nucleation of the C60 layer starts at the substrate’s inner step edges. Low-temperature STM of C60 molecules performed at 78 K demonstrates well-resolved molecular orbitals within individual molecules. In the C60 monolayer on the WO2/W(110) surface, the molecules are aligned in one direction due to intermolecular interaction, as shown by the ordered molecular orbitals of individual C60. STS data obtained from the C60 monolayer on the WO2/W(110) surface are in good agreement with DFT calculations.
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Self-Assembly and Ordering of C60 on the WO2/W(110) Surface. Nano Res. 2011, 4(2): 194–203

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