Abstract
Tungsten substrates were coated with an Ni or Ni–Co catalyst by the electroless dipcoating technique. Various carbon nanotubes were synthesized by the catalytic chemicalvapor deposition (CVD) method under different growth conditions. It was observed thatNi-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 of600 °C. We fabricated a field-emission-based luminescent light bulb where a tungsten wire coatedwith carbon nanotubes served as a cathode. Results show lower threshold voltage, betteremission stability and higher luminescence for CNT cathodes in comparison with uncoatedtungsten cathodes. We found that aligned-coiled carbon nanotubes are superior tostraight CNTs in terms of field emission characteristics and luminescence properties.
Published Version
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