Journal
APPLIED PHYSICS LETTERS
Volume 91, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2757122
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Structural units of the grain boundaries in ultrananocrystalline diamond thin films with different grain sizes were investigated using Raman spectroscopy. Characteristic peaks of well-defined molecular structural building blocks were detected in the near-infrared excited Raman spectra of these materials by limiting the excitation volume to the size of the crystallites using an optical microscope and surface enhanced Raman spectroscopy. The analysis of the spectra provides evidence for the presence of aromatic hydrocarbons and different sp(3) CHx groups in grain boundaries of these materials. (C) 2007 American Institute of Physics.
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