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Enhanced Field Emission Properties of Carbon Nanotube Based Field Emitters by Dynamic Oxidation

Author(s): Shama Parveen, Samina Husain, Avshish Kumar, Javid Ali, Mubashshir Husain, Harsh, Mushahid Husain.

Abstract:

Carbon Nanotubes (CNTs) are purified by Dynamic-oxidation (D-oxidation) technique to enhance the field emission behavior of CNT field emitters. In D-oxidation method, Carbon-type (C-type) impurities are removed out by selective oxidation by heating at constantly increasing temperature in air. It is observed that the turn-on voltage of D-oxidized CNTs is decreased from 4.4 V/µm to 3.6 V/µm, the current density is enhanced from 0.014 mA/cm2 to 1.12 mA/cm2 at an electric field of 6.4 V/m and effective emitting area is increased from ~ 2.18 x10-12 cm2 to 1.09 x10-9 cm2. These findings may be due to the removal of C-type impurities from the surface of CNTs during D-oxidation which exposes the large effective area for emission of electrons leading to enhanced emission current even at low turn-on voltage.

Keywords: Dynamic-oxidation, field enhancement factor, fowler-nordheim equation, low pressure chemical vapor deposition, scanning electron microscope, turn-on field.

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Article Details

VOLUME: 9
ISSUE: 5
Year: 2013
Page: [619 - 623]
Pages: 5
DOI: 10.2174/15734137113099990060
Price: $58