nanotehnoloogia, nanoteknologia, nanotechnologija, nanotehnologijas, nanoteknologija,
nanotechnologii, nanotecnologia, nanotehnologijo, nanoteknik
today announced that its researchers have built the
first complete electronic integrated circuit around
a single “carbon nanotube” molecule, a new material
that shows promise for providing enhanced performance
over today's standard silicon semiconductors.
The achievement is significant
because the circuit was built using standard semiconductor processes
and used a single molecule as the base for all components
in the circuit, rather than linking together individually-constructed
components. This can simplify manufacturing and provide
the consistency needed to more thoroughly test and
adjust the material for use in these applications.
The work was reported in an IBM paper
appearing in today's issue of the journal Science .
nanotube transistors have the potential to outperform
state-of-the-art silicon devices,” said Dr. T.C.
Chen, vice president, Science & Technology ,
IBM Research. “However, scientists have focused so
far on fabricating and optimizing individual carbon
nanotube transistors. Now, we can evaluate the potential
of carbon nanotube electronics in
complete circuits -- a critical step toward the integration
of the technology with existing chip -making
For some 50 years the semiconductor industry has relied on the ability to pack
increasing numbers of electronic circuits on a single silicon chip to make those
chips more powerful. This was achieved largely by finding ways to build circuits
smaller. With scientists seeing an end to that capability looming, the use of
nanotechnology is being explored as a means to keep the industry moving forward.
The field of nanotechnology involves the synthesis and assembly of new types
of molecules and structures with dimensions measured in billionths of a meter.
Looking like a microscopic roll of chicken wire, carbon nanotubes measure 50,000
times thinner than a human hair. Yet they have unique properties that may allow
them to carry higher current densities than the “pipes” currently used in today's
transistor and, with their smaller size, might allow for further miniaturization.
The circuit built by the IBM team was a ring oscillator
-- a circuit chip makers typically build to evaluate
new manufacturing processes or materials. The circuit
stresses certain properties that can give a good
indication of how new technologies will perform when
used to build complete chips.
By integrating the complete circuit around a single nanotube, the IBM team observed
circuit speeds nearly a million times faster than previously demonstrated circuits
with multiple nanotubes. While this is still slower than the speeds obtained
by today's silicon chips, the IBM team believes that new nanofabrication processes
will eventually unlock the superior performance potential of carbon nanotube
The IBM scientists will now use the ring oscillator to test improved carbon nanotube
transistors and circuits, and to gauge their performance in complete chip designs.
The report on this work, “An Integrated Logic Circuit Assembled on a Single Carbon
Nanotube,” by Zhihong Chen, Joerg Appenzeller, Yu-Ming Lin, Paul Solomon, and
Phaedon Avouris of IBM's T. J. Watson Research Center, Yorktown Heights, NY;
Jennifer Sippel-Oakley and Andrew G. Rinzler of the Department of Physics, University
of Florida, Gainesville, FL; and Jinyao Tang and Shalom J. Wind of the Department
of Chemistry and the Department of Applied Physics and Applied Mathematics, Columbia
University, New York, NY is published in the March 24th issue of the journal