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Comparing Field Emission Stability of Lithography-free, Modified Multi-walled Carbon Nanotubes

Published online by Cambridge University Press:  31 January 2011

Archana Pandey ,
Abhishek Prasad ,
Jason Moscatello  and
Yoke Khin Yap
Archana Pandey
Affiliation:
arpandey@mtu.edu, Michigan Technological University, Physics, Houghton, United States
Abhishek Prasad
Affiliation:
aprasad@mtu.edu, Michigan Technological University, Physics, Houghton, Michigan, United States
Jason Moscatello
Affiliation:
jpmoscat@mtu.edu, Michigan Technological University, Physics, Houghton, Michigan, United States
Yoke Khin Yap
Affiliation:
yoke.yap@scholarone.com, None, None, United States
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Abstract

Field emission from carbon nanotubes (CNTs) has been known for more than a decade but there is no commercialized product available in the market. Apparently, we need to improve our basics understanding on stable field emission from CNTs. Here we compared the field emission properties of as grown vertically-aligned multi-walled carbon nanotubes (MWCNTs) to two types of modified MWCNTs: 1) Conical bundles of opened-tip MWCNTs, and 2) Opened-tip MWCNTs embedded in poly-methyl methacrylate (PMMA). We found that both types of modified MWCNTs have lower emission thresholds and better emission stability than the as grown samples. Among these modified samples, MCNTs embedded in PMMA has lower emission thresholds and better emission stability. We attributed these improvements to the filling of spacing between MWCNTs with PMMA that has higher dielectric constant than vacuum.

Keywords

catalyticplasma-enhanced CVD (PECVD) (deposition)devices
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1204: Symposium K – Nanotubes and Related Nanostructures-2009 , 2009 , 1204-K18-22
Copyright
Copyright © Materials Research Society 2010

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