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A periodic, pearl chain-like nanostructure is observed in ultrahigh vacuum scanning tunneling microscopy (UHV-STM) of chromium filled carbon nanotubes. The structure displays one dimensional periodic morphology, with periodicity of ∼3.3nm. Atomically resolved STM image of the pearl chain structure shows hexagonal periodicity. The origin of the pearl chain structure is discussed.
Raman spectra of SWNTs suspended in aqueous solutions containing fragmented single-stranded DNA (SWNT:DNA), and films obtained from this suspension have been obtained. SEM study of the dried films indicated that the nanotubes tend to aggregate into bundles which results in the enhancement of the Raman intensity of the G − tangential band, and an upshift and broadening of the G + band...
Low voltage artificial muscles are of great importance for an enormous variety of industrial applications. In 1999 a new material, carbon nanotube sheets also called bucky paper, was described with suitable electromechanical properties. We developed an experimental set-up which allows, for the first time, the analysis of actuation forces vertical to the sheet plane. Single walled carbon nanotubes...
The electronic structure of purified single-wall carbon nanotubes obtained from HiPco process has been probed by X-ray fluorescent spectroscopy. The CKα spectrum of the HiPco nanotubes revealed a significant enhancement of the high-energy maximum intensity compared with the graphite spectrum. Quantum chemical calculations of carbon nanotube models show the spectral variations could be caused by vacancies...
Single-walled carbon nanotubes (SWNTs) produced by the high pressure CO disproportionation (HiPCO method) and purified by controlled thermal oxidation in air have been studied by Raman spectroscopy at 300 and 5 K. Raman spectra have been observed at λ exc =632.8 and 441.6 nm laser excitation in the range of 160-1800 cm -1 . In the low-frequency part of the spectra (the...
The direct conversion of electrical energy into mechanical energy is crucial for a number of high-technology applications. Macroscopic sheets of single-walled carbon nanotubes, working under physiological conditions (in salt water for example) and low voltage, have shown comparable or superior performances than natural muscle. Specific characteristics of single or nanotube bundles allows one to expect...
The spatial homogeneity of electronic properties, as evidenced by the local density of states (LDOS) of pure and B-doped multi-walled carbon nanotubes, is investigated using scanning tunneling microscopy and tunneling spectroscopy. For pure nanotubes, the LDOS is found to be uniform except for the tip of the tubes. B-doped tubes, in contrast, show characteristic spatial variations in the electronic...
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