TITLE

# Current-controlled nanotube growth and zone refinement

AUTHOR(S)
Jensen, K.; Mickelson, W.; Han, W.; Zettl, A.
PUB. DATE
April 2005
SOURCE
Applied Physics Letters;4/25/2005, Vol. 86 Issue 17, p173107
SOURCE TYPE
DOC. TYPE
Article
ABSTRACT
We describe methods by which the growth of a single carbon nanotube (CNT) can be precisely controlled by an electrical current. In one method a CNT is grown to a predetermined geometry inside another nanotube, which serves as a reaction chamber. Another method allows a preexisting marginal-quality multiwall CNT to be zone refined into a higher-quality multiwall CNT by driving a catalytic bead down the length of the nanotube. In both methods, the speed of nanotube formation is adjustable, and the growth can be stopped and restarted at will.
ACCESSION #
17227594

## Related Articles

• Temperature-dependent studies of Y-junction carbon nanotube electronic transport. Papadopoulos, C.; Yin, A. J.; Xu, J. M. // Applied Physics Letters;9/6/2004, Vol. 85 Issue 10, p1769

Electronic transport in Y-junction carbon nanotubes was examined as a function of temperature. Rectifying behavior was observed from 10 to 300 K with the conductance displaying power-law dependencies on temperature and applied bias. The data are consistent with models for tunneling between two...

• Locally Minimal Trees in $n$-Normed Spaces. Il'yutko, D. P. // Mathematical Notes;Nov/Dec2003, Vol. 74 Issue 5/6, p619

The locally minimal trees in normed spaces $\left(\left\{\Bbb R\right\}^2,\rho\right)$, where the unit circle $\Sigma=\ x\in\left\{\Bbb R^2\mid\left\{\rho\right\}\left(x\right)= 1\\right\}$ in the norm $\rho$ coincides with the regular $m$-gon ($m=2n$) inscribed in the Euclidean unit circle...

• An ab initio study of 1,5-suprafacial shifts in 5-substituted 1,3-cyclopentadienes. Pye, Cory C.; Poirier, Raymond A. // Canadian Journal of Chemistry;Sep2005, Vol. 83 Issue 9, p1299

A computational study of the degenerate 1,5-suprafacial migration of the 5-substituted cyclopentadienes is presented. The substituents considered are the Group 14â€“17 elements of the second through fifth periods, saturated by hydrogens as needed to fulfill normal valence requirements. The...

• Seeing How It Goes: Paper-and-Pencil Reasoning in Mathematical Practiceâ€ . Macbeth, Danielle // Philosophia Mathematica;Feb2012, Vol. 20 Issue 1, p58

Throughout its long history, mathematics has involved the use ofsystems of written signs, most notably, diagrams in Euclidean geometry and formulae in the symbolic language of arithmetic and algebra in the mathematics of Descartes, Euler, and others. Such systems of signs, I argue, enable one to...

• EuÂ·clid.  // American Heritage Student Science Dictionary;2009, p121

An encyclopedia entry on "Euclid," a third century Greek mathematician, is presented. Euclid's book, "Elements," was used continuously until the 19th century. In it, he organized and systematized all that was known about geometry. Euclid's systematic use of deductions and axioms was widely...

• On the stability of a compressible Rivlin's cube made of transversely isotropic material. SOLDATOS, KOSTAS P. // IMA Journal of Applied Mathematics;Jun2006, Vol. 71 Issue 3, p332

This paper considers a unit cube made of a compressible, transversely isotropic elastic material, with the direction of transverse isotropy being aligned normal to one pair of the cube's faces, and investigates the stability of a dilatation equilibrium state of that cube, with respect to...

• Analysis of 2 x 2 tables of frequencies: matching test to experimental design.  // International Journal of Epidemiology;Dec2008, Vol. 37 Issue 6, p1430

Background Biomedical investigators often use unsuitable statistical techniques for analysing the 2 ÃƒÂ— 2 tables that result from their experimental observations. This is because they are confused by the conflicting, and sometimes inaccurate, advice they receive from statistical texts or...

• A Special Kind of Misunderstanding: Mathematical Relations in Geometry. Chesler, Joshua; McGraw, Rebecca // Conference Papers -- Psychology of Mathematics & Education of No;2007 Annual Meeting, p1

In this paper, we examine elementary pre-service teachers' understanding of the phrase "is a special kind of" as in "a square is a special kind of rectangle." Data collected from 109 students indicated that they possess varying interpretations of the phrase. Our findings suggest that difficulty...

• Geometry Teachers' Perspectives on Convincing and Proving When Installing a Theorem in Class. Miyakawa, Takeshi; Herbst, Patricio // Conference Papers -- Psychology of Mathematics & Education of No;2007 Annual Meeting, p1

This paper aims to advance understanding of instructional phenomena by focusing on the nature of an instructional situation. We argue that the decisions in managing a situation require a teacher to respond to norms by negotiating dispositions activated in the situation that could contradict each...

Share