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Double-walled carbon nanotubes under hydrostatic pressure
2008 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

High pressure Raman experiments were performed on a bundled double-wall carbon nanotubes (DWNTs) up to p = 9.50 GPa using 532 nm (2.33 eV) and 632.8 nm (1.96 eV) laser excitation energies. The intensity of the radial breathing modes of the outer tubes decreases rapidly but remained observable up to p = 9.33 GPa, exhibiting a similar behaviour (but less pronounced) to that of single-wall carbon nanotubes which undergo a shape distortion at higher pressures. The inner tubes sustain pressure of atleast 9.50 GPa. The detailed examination of the Radial breathing mode ( RBM) of the inner and outer tubes as a function of pressure by Raman spectroscopy provides information concerning the pressure response of DWCNTs. The RBM pressure derivatives, dƒçi/dP of the outer tubes are six to ten times larger than those of the inner tubes ( 6.3 ¡V 10.3 vs 1.5 cm-1/GPa) dependent on the laser excitation used. As a consequence, we observed the separation of the tangential modes of the outer tubes from that of the inner ones on pressure increase due to the difference in their pressure derivatives. Upon release of pressure, the Raman peaks are fully reversible with broadening of peaks due to residual pressure-induced deformations present inside the sample. All the above observations evidence that outer tubes in DWNTs act as a protection shield for the inner tube whereas the inner tubes provide the structural stability of the outer tubes upon pressure application.

Place, publisher, year, edition, pages
2008.
Keyword [en]
Physics Chemistry Maths, DWCNT, Hydrostatic pressure, Raman spectroscopy, Diamond, Anvil cell
Keyword [sv]
Fysik, Kemi, Matematik
Identifiers
URN: urn:nbn:se:ltu:diva-43522ISRN: LTU-PB-EX--08/001--SELocal ID: 165f0e9c-c298-4f85-9720-ec7d1eae6179OAI: oai:DiVA.org:ltu-43522DiVA: diva2:1016755
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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