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Science 17 November 1995:
Vol. 270. no. 5239, pp. 1179 - 1180
DOI: 10.1126/science.270.5239.1179
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Reports
A Carbon Nanotube Field-Emission Electron Source
Walt A. de Heer (1),
A. Châtelain,
D. Ugarte
A high-intensity electron gun based on field emission from a film
of aligned carbon nanotubes has been made. The gun consists of a
nanotube film with a 1-millimeter-diameter grid about 20 micrometers
above it. Field-emission current densities of about 0.1 milliampere per
square centimeter were observed for applied voltages as low as 200
volts, and current densities greater than 100 milliamperes per square
centimeter have been realized at 700 volts. The gun is air-stable, easy
and inexpensive to fabricate, and functions stably and reliably for
long times (short-term fluctuations are on the order of 10 percent).
The entire gun is only about 0.2 millimeter thick and can be produced
with virtually no restrictions on its area, from less than 1 square
millimeter to hundreds of square centimeters, making it suitable for
flat panel display applications.
W. A. de Heer and A. Châtelain, Institut de Physique
Expérimentale, Ecole Polytechnique Fédérale de
Lausanne, PHB Ecublens, CH-1015 Lausanne, Switzerland.
D. Ugarte, Laboratório Nacional de Luz Síncrotron
(CNPq/MCT), Cx. Postal 6192, 13081-970 Campinas SP, Brazil.
(1) To whom correspondence should be addressed.
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