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Field Emission Properties of Thin Molybdenum Carbide and Diamond Films Deposited by Dielectrophoresis

Published online by Cambridge University Press:  10 February 2011

Ambrosio A. Rouse ,
John B. Bernhard ,
Edward D. Sosa  and
David E. Golden
Ambrosio A. Rouse
Affiliation:
University of North Texas, Department of Physics & Material Science, Denton, Texas
John B. Bernhard
Affiliation:
University of North Texas, Department of Physics & Material Science, Denton, Texas
Edward D. Sosa
Affiliation:
University of North Texas, Department of Physics & Material Science, Denton, Texas
David E. Golden
Affiliation:
University of North Texas, Department of Physics & Material Science, Denton, Texas
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Abstract

Molybdenum carbide and diamond films were deposited at room temperature by dielectrophoresis on molybdenum foil and field emission tips. Films deposited on flat surfaces were characterized with XPS, UPS and SEM. Field emission Fowler-Nordheim current-voltage characteristics and electron energy distribution measurements were obtained using films deposited on field emission tips as part of a single aperture gated diode in a VG ESCALAB II system. Molybdenum trioxide was present after molybdenum carbide deposition at room temperature on all samples. At a temperature of about 650 °C, the dominant oxide changes to molybdenum dioxide. At about 800 °C, the oxygen content of the films significantly decreases and molybdenum carbide with significant graphite content remains. The UPS data for these samples were obtained at different annealing temperatures and a number of photon energies to determine photoelectric work functions for molybdenum trioxide, molybdenum dioxide and molybdenum carbide. The same kind of data was obtained for diamond deposited on molybdenum and molybdenum carbide coated foils and field emission tips.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 558: Symposium B – Flat-Panel Displays and Sensors-Principles, Materials… , 1999 , 117
Copyright
Copyright © Materials Research Society 2000

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