Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 110, Issue 2, Pages 493-499Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-012-7252-4
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Funding
- University Grants Commission (UGC), the Government of India
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Amorphous carbon nanotubes (aCNTs) were synthesized by a chemical reaction between ferrocene and ammonium chloride at a temperature similar to 250 C-a similar to in an air furnace. As-synthesized aCNTs were coated with the barium/strontium carbonate through a simple chemical process. The coating of barium/strontium carbonate was confirmed by a high resolution transmission electron microscopy, X-ray diffraction, and Fourier transformed infrared spectroscopy. Morphology of the as-prepared samples was studied by field emission scanning electron microscopy. Thermal gravimetric analysis showed that barium/strontium carbonate coated aCNTs are more stable than the pristine aCNTs. As-prepared barium/strontium carbonate coated aCNTs showed significantly improved field emission properties with a turn-on field as low as 2.5 V/mu m. The variation of field emission characteristics of the barium/strontium carbonate coated aCNTs with interelectrode distances was also studied.
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