Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Field Emission from Carbon Nanotubes Etched by a dc Plasma

Cho, Hyun-Jin;Lee, Nae-Sung;Jang, In-Goo;Uh, Hyung-Soo;Hong, Jin-Pyo

  • Published : 20070600
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Abstract

Abstract This study investigates the effect of NH$_3$ gas upon the growth of carbon nanotubes (CNTs) using thermal chemical vapor deposition. It is considered that the CNT synthesis is thought to occur mainly through two steps, clustering of catalyst particles followed by growth of CNTs. We, thus, introduced NH$_3$ during either an annealing or growth step. When NH$_3$ was fed only during annealing, CNTs grew longer and were more highly crystalline with their diameters unchanged. Addition of NH$_3$ during growth, however, resulted in shorter CNTs with lower crystallinity and increased diameters. Vertically aligned, highly populated CNT samples showed poor field emission characteristics, leading us to apply post-treatment onto the CNT surface. The CNTs were etched back by dc plasma of N$_2$ to reduce the population density and the radius of curvatures of CNTs, which resulted in a considerable improvement of the field emission characteristics.

Keywords

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