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Defect-related hysteresis in nanotube-based nano-electromechanical systems.

Tsetseris L, Pantelides ST - Nanoscale Res Lett (2011)

Bottom Line: This fact can enable several applications of MWCNTs as nano-electromechanical systems (NEMS).Key defect-related effects, namely, sudden energy changes and hysteresis, are identified, and their relevance to a host of MWCNT-based NEMS is highlighted.The results also demonstrate the dependence of these effects on defect clustering and chirality of DWCNT shells.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, National Technical University of Athens, GR-15780 Athens, Greece. leont@mail.ntua.gr.

ABSTRACT
The electronic properties of multi-walled carbon nanotubes (MWCNTs) depend on the positions of their walls with respect to neighboring shells. This fact can enable several applications of MWCNTs as nano-electromechanical systems (NEMS). In this article, we report the findings of a first-principles study on the stability and dynamics of point defects in double-walled carbon nanotubes (DWCNTs) and their role in the response of the host systems under inter-tube displacement. Key defect-related effects, namely, sudden energy changes and hysteresis, are identified, and their relevance to a host of MWCNT-based NEMS is highlighted. The results also demonstrate the dependence of these effects on defect clustering and chirality of DWCNT shells.

No MeSH data available.


Related in: MedlinePlus

Energy variation during inter-tube rotation of a (6,6)@(11,11) carbon nanotube with a C SI (filled and open squares for rotation in opposite angles). The lines with almost vanishing values (filled circles) at the bottom are for the pristine case of no defects and for a single vacancy on the inner tube.
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Figure 6: Energy variation during inter-tube rotation of a (6,6)@(11,11) carbon nanotube with a C SI (filled and open squares for rotation in opposite angles). The lines with almost vanishing values (filled circles) at the bottom are for the pristine case of no defects and for a single vacancy on the inner tube.

Mentions: Figure 6 shows the variation of energy when the inner shell is rotated in small angles. As in the case of sliding, the first stretching phase is suddenly interrupted through an abrupt transformation to a neighboring inter-tube configuration. Unlike sliding, however, repeated stretching cycles during rotation force the SI to move along with the inner shell, while its bonds to the outer tube switch sequentially to neighboring sites. The abrupt changes depicted in Figure 6 can give rise to hysteresis when rotation direction is reversed. This effect is shown as open squares in the figure.


Defect-related hysteresis in nanotube-based nano-electromechanical systems.

Tsetseris L, Pantelides ST - Nanoscale Res Lett (2011)

Energy variation during inter-tube rotation of a (6,6)@(11,11) carbon nanotube with a C SI (filled and open squares for rotation in opposite angles). The lines with almost vanishing values (filled circles) at the bottom are for the pristine case of no defects and for a single vacancy on the inner tube.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211306&req=5

Figure 6: Energy variation during inter-tube rotation of a (6,6)@(11,11) carbon nanotube with a C SI (filled and open squares for rotation in opposite angles). The lines with almost vanishing values (filled circles) at the bottom are for the pristine case of no defects and for a single vacancy on the inner tube.
Mentions: Figure 6 shows the variation of energy when the inner shell is rotated in small angles. As in the case of sliding, the first stretching phase is suddenly interrupted through an abrupt transformation to a neighboring inter-tube configuration. Unlike sliding, however, repeated stretching cycles during rotation force the SI to move along with the inner shell, while its bonds to the outer tube switch sequentially to neighboring sites. The abrupt changes depicted in Figure 6 can give rise to hysteresis when rotation direction is reversed. This effect is shown as open squares in the figure.

Bottom Line: This fact can enable several applications of MWCNTs as nano-electromechanical systems (NEMS).Key defect-related effects, namely, sudden energy changes and hysteresis, are identified, and their relevance to a host of MWCNT-based NEMS is highlighted.The results also demonstrate the dependence of these effects on defect clustering and chirality of DWCNT shells.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, National Technical University of Athens, GR-15780 Athens, Greece. leont@mail.ntua.gr.

ABSTRACT
The electronic properties of multi-walled carbon nanotubes (MWCNTs) depend on the positions of their walls with respect to neighboring shells. This fact can enable several applications of MWCNTs as nano-electromechanical systems (NEMS). In this article, we report the findings of a first-principles study on the stability and dynamics of point defects in double-walled carbon nanotubes (DWCNTs) and their role in the response of the host systems under inter-tube displacement. Key defect-related effects, namely, sudden energy changes and hysteresis, are identified, and their relevance to a host of MWCNT-based NEMS is highlighted. The results also demonstrate the dependence of these effects on defect clustering and chirality of DWCNT shells.

No MeSH data available.


Related in: MedlinePlus