期刊
JOURNAL OF MICROSCOPY
卷 231, 期 1, 页码 144-155出版社
WILEY
DOI: 10.1111/j.1365-2818.2008.02025.x
关键词
deformation; EELS; I-V measurements; single walled carbon nanotubes; STM; TEM; TEM-STM
类别
资金
- Engineering and Physical Sciences Research Council [EP/E059678/1] Funding Source: researchfish
- EPSRC [EP/E059678/1] Funding Source: UKRI
We have evaluated a combined transmission electron microscopy (TEM)-scanning tunnelling microscopy (STM) (hence TEM-STM) sample holder for the investigation of the mechanical and electrical properties of individual bundles of single-walled carbon nanotubes (SWCNTs) together with their simultaneous observation, analysis and mechanical modification in the TEM. Current-voltage (I-V) measurements from bundles of SWCNTs were observed to change as the bundles were deformed both reversibly and irreversibly, although the observed behaviour was somewhat complex. Electron energy loss spectroscopy (EELS) analysis revealed measurable changes in the bonding of the carbon atoms within the graphene layers upon bundle deformation, with measurable changes in the pi*/(pi* + sigma*) peak ratios observed at the carbon K-edge. Reversible deformation of the bundles was consistent with the sensitivity of sigma bonding to deviations from nonplanarity, whereas irreversible deformation was consistent with the introduction of nonhexagonal defects into the graphene sheets.
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