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"Carbon nanotube intramolecular
junctions," by Zhen Yao, Henk
W.Ch. Postma, Leon Balents, and Cees Dekker, Nature, 402(6759):273-6,
18 November 1999.
[Authors' affiliations: Delft University of
Technology, Netherlands; Bell Laboratories, Lucent Technologies, Murray Hill,
NJ]
Abstract: "The ultimate device
miniaturization would be to use individual molecules as functional devices.
Single-wall carbon nanotubes (SWNTs) are promising candidates for achieving
this: depending on their diameter and chirality, they are either
one-dimensional metals or semiconductors. Single-electron transistors
employing metallic nanotubes have been demonstrated. Intramolecular devices
have also been proposed which should display a range of other device
functions. For example, by introducing a pentagon and a heptagon into the
hexagonal carbon lattice, two tube segments with different atomic and
electronic structures can be seamlessly fused together to create
intramolecular metal-metal, metal-semiconductor, or
semiconductor-semiconductor junctions. Here we report electrical transport
measurements on SWNTs with intramolecular junctions. We find that a
metal-semiconductor junction behaves like a rectifying diode with nonlinear
transport characteristics that are strongly asymmetric with respect to bias
polarity. In the case of a metal-metal junction, the conductance appears to be
strongly suppressed and it displays a power-law dependence on temperatures and
applied voltage, consistent with tunnelling between the ends of two Luttinger
liquids. Our results emphasize the need to consider screening and electron
interactions when designing and modelling molecular devices. Realization of
carbon-based molecular electronics will require future efforts in the
controlled production of intramolecular nanotube junctions."
This 1999 paper from Nature was cited 20
times in current journal articles indexed in the ISI database during
September-October 2001. No other non-review paper in chemistry (or in the
border region between chemistry and materials science) received as many
citations during that two-month period. Prior to the most recent bimonthly
count, citations to the paper have accrued as follows:
July-August 2001: 7 citations
May-June 2001: 10
March-April 2001: 9
January-February 2001: 13
November-December 2000: 10
September-October 2000: 9
July-August 2000: 8
May-June 2000: 4
March-April 2000: 2
Total citations to date: 92
SOURCE: Hot
Papers Database (Available from the ISI
Research Services Group in a CD-ROM version containing data on
hundreds of highly cited papers published during the last two years.
User interface permits searching by author, organization, journal,
field, and more. Total citations, as well as citations accrued during
successive bimonthly periods, can be assessed and graphed. Database is
combined with subscription to the ISI newsletter Science
Watch®; updated discs containing the
most recent bimonthly data are mailed with each new issue, six times a
year.)
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