Radial thermal expansion of pure and Xe-saturated bundles of single-walled carbon nanotubes at low temperatures

Details Radial thermal expansion of pure and Xe-saturated bundles of single-walled carbon nanotubes at low temperatures Radial thermal expansion of pure and Xe-saturated bundles of single-walled carbon nanotubes at low temperatures

2009-02-17

arxiv.org/abs/0902.2929v2

Fizika Nizkih Temperatur, 2009, V.35, No.6, p.613-621

Physics

Condensed Matter

Materials Science

12 pages,6 figures

Scientific paper

10.1063/1.1542277

The radial thermal expansion coefficient (a)r of pure and Xe-saturated bundles of single-walled carbon nanotubes has been measured in the interval 2.2-120 K. The coefficient is positive above T = 5.5 K and negative at lower temperatures. The experiment was made using a low temperature capacitance dilatometer with a sensitivity of 2x10-9 cm and the sample was prepared by compacting a CNT powder such that the pressure applied oriented the nanotube axes perpendicular to the axis of the cylindrical sample. The data show that individual nanotubes have a negative thermal expansion while the solid compacted material has a positive expansion coefficient due to expansion of the intertube volume in the bundles. Doping the nanotubes with Xe caused a sharp increase in the magnitude of (a)r in the whole range of temperatures used, and a peak in the dependence (a)r (T) in the interval 50-65 K. A subsequent decrease in the Xe concentration lowered the peak considerably but had little effect on the thermal expansion coefficient of the sample outside the region of the peak. The features revealed have been explained qualitatively.

Affiliated with

Also associated with

No associations

Rating

Radial thermal expansion of pure and Xe-saturated bundles of single-walled carbon nanotubes at low temperatures does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Radial thermal expansion of pure and Xe-saturated bundles of single-walled carbon nanotubes at low temperatures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radial thermal expansion of pure and Xe-saturated bundles of single-walled carbon nanotubes at low temperatures will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-311108