The fabrication of carbon-nanotube-coated electrodes and a field-emission-based luminescent device

Tungsten substrates were coated with an Ni or Ni-Co catalyst by the electroless dip coating technique. Various carbon nanotubes were synthesized by the catalytic chemical vapor deposition (CVD) method under different growth conditions. It was observed that Ni-and Ni-Co-coated tungsten substrates giv...

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Bibliographic Details
Published in:Nanotechnology 2010-02, Vol.21 (6), p.065601-065601
Main Authors: Agarwal, Sanjay, Yamini Sarada, B, Kar, Kamal K
Format: Article
Language:English
Subjects:
Alignment
Carbon nanotubes
Catalysts
Cathodes
Chemical vapor deposition
Field emission
Luminescence
Nickel
Tungsten
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Summary:Tungsten substrates were coated with an Ni or Ni-Co catalyst by the electroless dip coating technique. Various carbon nanotubes were synthesized by the catalytic chemical vapor deposition (CVD) method under different growth conditions. It was observed that Ni-and Ni-Co-coated tungsten substrates give very good growth of carbon nanotubes (CNT) in terms of yield, uniformity and alignment at a growth temperature of 600 degrees C. We fabricated a field-emission-based luminescent light bulb where a tungsten wire coated with carbon nanotubes served as a cathode. Results show lower threshold voltage, better emission stability and higher luminescence for CNT cathodes in comparison with uncoated tungsten cathodes. We found that aligned-coiled carbon nanotubes are superior to straight CNTs in terms of field emission characteristics and luminescence properties.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/21/6/065601