Enhanced field emission properties of carbon nanotube bundles confined in SiO2 pits

Yu Dian Lim; Dmitry Grapov; Liangxing Hu; Qinyu Kong; Beng Kang Tay; Vladimir Labunov; Jianmin Miao; Philippe Coquet; Sheel Aditya

doi:10.1088/1361-6528/aaa1bb

Enhanced field emission properties of carbon nanotube bundles confined in SiO₂ pits

Yu Dian Lim, Dmitry Grapov, Liangxing Hu, Qinyu Kong, Beng Kang Tay^*, Vladimir Labunov, Jianmin Miao, Philippe Coquet, Sheel Aditya

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

It has been widely reported that carbon nanotubes (CNTs) exhibit superior field emission (FE) properties due to their high aspect ratios and unique structural properties. Among the various types of CNTs, random growth CNTs exhibit promising FE properties due to their reduced inter-tube screening effect. However, growing random growth CNTs on individual catalyst islands often results in spread out CNT bundles, which reduces overall field enhancement. In this study, significant improvement in FE properties in CNT bundles is demonstrated by confining them in microfabricated SiO₂ pits. Growing CNT bundles in narrow (0.5 μm diameter and 2 μm height) SiO₂ pits achieves FE current density of 1-1.4 A cm^-2, which is much higher than for freestanding CNT bundles (76.9 mA cm^-2). From the Fowler Nordheim plots, confined CNT bundles show a higher field enhancement factor. This improvement can be attributed to the reduced bundle diameter by SiO₂ pit confinement, which yields bundles with higher aspect ratios. Combining the obtained outcomes, it can be conclusively summarized that confining CNTs in SiO₂ pits yields higher FE current density due to the higher field enhancement of confined CNTs.

Original language	English
Article number	075205
Journal	Nanotechnology
Volume	29
Issue number	7
DOIs	https://doi.org/10.1088/1361-6528/aaa1bb
Publication status	Published - Jan 15 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018 IOP Publishing Ltd.

ASJC Scopus Subject Areas

Bioengineering
General Chemistry
General Materials Science
Mechanics of Materials
Mechanical Engineering
Electrical and Electronic Engineering

Keywords

carbon nanotubes
field emission
SiO pits

Access to Document

10.1088/1361-6528/aaa1bb

Cite this

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abstract = "It has been widely reported that carbon nanotubes (CNTs) exhibit superior field emission (FE) properties due to their high aspect ratios and unique structural properties. Among the various types of CNTs, random growth CNTs exhibit promising FE properties due to their reduced inter-tube screening effect. However, growing random growth CNTs on individual catalyst islands often results in spread out CNT bundles, which reduces overall field enhancement. In this study, significant improvement in FE properties in CNT bundles is demonstrated by confining them in microfabricated SiO2 pits. Growing CNT bundles in narrow (0.5 μm diameter and 2 μm height) SiO2 pits achieves FE current density of 1-1.4 A cm-2, which is much higher than for freestanding CNT bundles (76.9 mA cm-2). From the Fowler Nordheim plots, confined CNT bundles show a higher field enhancement factor. This improvement can be attributed to the reduced bundle diameter by SiO2 pit confinement, which yields bundles with higher aspect ratios. Combining the obtained outcomes, it can be conclusively summarized that confining CNTs in SiO2 pits yields higher FE current density due to the higher field enhancement of confined CNTs.",

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AU - Grapov, Dmitry

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AU - Tay, Beng Kang

AU - Labunov, Vladimir

AU - Miao, Jianmin

AU - Coquet, Philippe

AU - Aditya, Sheel

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N2 - It has been widely reported that carbon nanotubes (CNTs) exhibit superior field emission (FE) properties due to their high aspect ratios and unique structural properties. Among the various types of CNTs, random growth CNTs exhibit promising FE properties due to their reduced inter-tube screening effect. However, growing random growth CNTs on individual catalyst islands often results in spread out CNT bundles, which reduces overall field enhancement. In this study, significant improvement in FE properties in CNT bundles is demonstrated by confining them in microfabricated SiO2 pits. Growing CNT bundles in narrow (0.5 μm diameter and 2 μm height) SiO2 pits achieves FE current density of 1-1.4 A cm-2, which is much higher than for freestanding CNT bundles (76.9 mA cm-2). From the Fowler Nordheim plots, confined CNT bundles show a higher field enhancement factor. This improvement can be attributed to the reduced bundle diameter by SiO2 pit confinement, which yields bundles with higher aspect ratios. Combining the obtained outcomes, it can be conclusively summarized that confining CNTs in SiO2 pits yields higher FE current density due to the higher field enhancement of confined CNTs.

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