Enhanced field emission from nano-graphite coated carbon nanotubes

LOW ENERGY ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS

Enhanced field emission from nano-graphite coated carbon nanotubes

LI Qintao，

NI Zhichun，

GONG Jinlong，

ZHU Dezhang，

ZHU Zhiyuan

Nuclear Science and Techniques

Vol.18, No.5

pp.276-281

Published in print 20 Oct 2007

DOI：10.1016/S1001-8042(07)60061-X

CLC：TB383,TB303

49900

An effective method by low energy carbonhydrogen ion treatment to enhance field emission of the carbon nanotubes (CNTs) is demonstrated. Comparing with control, field emission (FE) currents of the CNTs by carbonhydrogen ion irradiation increased, and the turn-on field and the threshold field decreased significantly. The structure characteristic revealed by transmission electron microscopy demonstrates that CNTs are coated by nano-graphite particles after being treated with low energy carbonhydrogen ion and that there are large quantities of defects and grain boundaries in the coated layer. It is considered that the coating layer can decrease the effective surface work function of CNTs and correspondingly increase field emission. In addition, the defects, the grain boundaries and the C-H dipoles forming in the process of the low energy ions irradiation can effectively enhance the field emission.

GraphiteCarbon nanotubesIon beam depositionField emission

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