Document Detail

Single-wall carbon nanotubes under high pressures to 62 GPa studied using designer diamond anvils.
MedLine Citation:
PMID:  12914044     Owner:  NLM     Status:  MEDLINE    
Single-wall carbon nanotube samples were studied under high pressures to 62 GPa using designer diamond anvils with buried electrical microprobes that allowed for monitoring of the four-probe electrical resistance at elevated pressure. After initial densification, the electrical resistance shows a steady increase from 3 to 42 GPa, followed by a sharp rise above 42 GPa. This sharp rise in electrical resistance at high pressures is attributed to opening of an energy band gap with compression. Nanoindentation hardness measurements on the pressure-treated carbon nanotube samples gave a hardness value of 0.50 +/- 0.03 GPa. This hardness value is approximately 2 orders of magnitude lower than the amorphous carbon phase produced in fullerenes under similar conditions. Therefore, the pressure treatment of single-wall carbon nanotubes to 62 GPa did not produce a superhard carbon phase.
J R Patterson; Y K Vohra; S T Weir; J Akella
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of nanoscience and nanotechnology     Volume:  1     ISSN:  1533-4880     ISO Abbreviation:  J Nanosci Nanotechnol     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2003-08-13     Completed Date:  2003-09-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  101088195     Medline TA:  J Nanosci Nanotechnol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  143-7     Citation Subset:  IM    
Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294-1170, USA.
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MeSH Terms
Crystallization / methods*
Electric Impedance
Electrochemistry / instrumentation,  methods*
Materials Testing / methods*
Molecular Conformation
Nanotechnology / methods*
Nanotubes, Carbon / chemistry*,  isolation & purification
Surface Properties
Reg. No./Substance:
0/Nanotubes, Carbon; 7782-40-3/Diamond

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