Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 210, Issue 2, Pages 349-355Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201228415
Keywords
carbon nanotubes; field emission; ionization vacuum gauge; MgO nanoparticles
Funding
- National Natural Science Foundation of China [60971002]
- 973 project of MOST [2013CB933604]
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Composite films of carbon nanotubes (CNTs) and MgO nanoparticles are fabricated on metal substrates as field emitters by a simple mechanical rubbing method. The field emission properties of the CNT films could be dramatically improved by mixing an optimum proportion (similar to 7 wt%) of MgO nanoparticles. It lowers the turn-on field to 1.3 V mu m(-1) and the threshold field to 2 V mu m(-1), and also increases the field emission stability and uniformity. Such CNTs-MgO films are applied as cathode in ionization vacuum gauges. The gauges, with the advantages of small size and low power consumption, exhibit good measurement linearity in vacuum pressure range from 8 x 10(-6) to 2 x 10(-2) Pa, and a sensitivity of 0.2 Pa-1. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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