Electron emission properties of carbon nanotubes

Effect of substrate heating and microwave attenuation on the catalyst free growth and field emission of carbon nanotubes

“…7 shows field emission measurement results on the samples A, B and C respectively. It is known form the previous works [15,18,39,40] that field emission from CNTs is governed by Fowler-Nordheim (F-N) equation as given below [39][40][41].…”

“…But, direct growth of CNTs on metal surfaces normally involves in-situ formation of catalyst nanoparticles on the metallic substrates [14,15] which is normally found to be difficult. Nevertheless, people have tried and there are some reports regarding this type of growth [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Talapatra et al [13] have grown vertically aligned CNTs on Inconel substrates using CVD process with ferrocene-xylene precursors and studied their properties for the applications as double-layer capacitors and field-emitter devices.…”

“…Gao et al [22] reported growth of CNTs on Inconel 600 by pyrolysis of Iron phthalocyanine in the presence of C 2 H 4 and showed their application as electrode material for supercapacitors. Hirakawa et al [18] investigated growth of CNTs on different substrates like Inconel 600, Invar-42, SS 304, and Ni using DC-PECVD and compared the field emission behavior of the grown CNTs on different substrates. They obtained maximum current density of around 6 mA/cm 2 at an electric field of 5 V/lm for Invar-42.…”

“…They discussed about the necessity of prior substrate etching for the successful growth of CNTs. From all these reported investigations, it is evident that a good amount of work has been done on the growth of CNTs on metals and their field emission behavior [13][14][15]18,28] but it is observed that there are not much systematic studies on the field emission behavior of the CNTs grown directly on metal surfaces with variation in the deposition process parameters. Our present work is different from them as we have systematically introduced the concept of substrate heating and microwave attenuation together to understand their effects on CNT growth and its field emission properties.…”

Enhancement of field emission properties of graphite flakes by producing carbon nanotubes on above using thermal chemical vapor deposition

“…In addition, stability and uniformity are also important issues for practical applications. Excellent electron field emission characteristics with low turn-on electric field and high-current density have been observed from various materials, for example, carbon nanotube (CNT) [1][2][3], diamond [4], diamond-like carbon [5,6] and other carbon structures [7,8].…”