A Simple Method for Controlled Growth of Carbon Nanocoils on Metallic Wire by Chemical Vapor Deposition

作者：Sarada B Yamini; Agarwal Sanjay^*; Kar Kamal K

来源：Nanoscience and Nanotechnology Letters, 2009, 1(3): 213-217.

DOI：10.1166/nnl.2009.1035

• Carbon Nanocoils
• Chemical Vapor Deposition
• Electron Microscopy
• Thermogravimetric Analysis
• Field Emission Properties

Carbon nanocoils have been synthesized by catalytic pyrolysis of acetylene on Ni catalyst coated metallic substrate at 600 degrees C and 700 degrees C growth temperature by chemical vapor deposition. It was found that nanocoils can be mostly vertically aligned on a kanthal (Fe-Cr-Al) wire when growth domain reaches a certain value. Pre-treatment of Fe-Cr-Al alloy by the solution containing HNO(3), H(2)O(2), and H(2)C(2)O(4), subsequently etching with H(2)SO(4) prior to the synthesis is crucial for high yield and vertical alignment. The field emission properties are demonstrated for fabricated cold cathodes. The uncoated kanthal cathode achieved the current 388 mu A at 0.6 V/mu m applied field. The carbon nanocoil coated cathodes at 600 degrees C and 700 degrees C growth temperature achieved the current 705 mu A and 873 mu A at 0.6 V/mu m while carbon nanotube coated cathode reaches 582 mu A at the same applied field. The results can be applied to find a set of optimal parameters that could be used for a variety of vacuum electronic devices.

• 出版日期2009-12