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Field Emission from Nanocrystalline Diamond/Carbon Nanowall Composite Films Deposited on Scratched Substrates

Published online by Cambridge University Press:  10 January 2012

C.Y. Cheng ,
M. Nakashima  and
K. Teii
C.Y. Cheng
Affiliation:
Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
M. Nakashima
Affiliation:
Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
K. Teii
Affiliation:
Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
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Abstract

We report the deposition and field emission properties of nanostructured composites consisting of carbon nanowalls (CNWs) and nanocrystalline diamond films by introducing two kinds of substrate scratching pretreatment, i.e., undulation and ultrasonic vibration. With increasing duration of scratching pretreatment, the morphology of the deposits changes from simple CNWs to a film/CNW composite and lastly to CNWs on a film, and then the space between the walls is increased. The emission turn-on field is reduced from 2.1 V/μm for simple CNWs to around 1.2 V/μm for the composite films, accompanied by an increase in field enhancement factor. The results indicate that electric field screening between the walls is successfully suppressed by widening of the wall spacing.

Keywords

diamondplasma-enhanced CVD (PECVD) (deposition)composite
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1395: Symposium N – Diamond Electronics and Biotechnology–Fundamentals to Applications V , 2012 , mrsf11-1395-n12-24
Copyright
Copyright © Materials Research Society 2012

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References

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