Enhanced field emission properties of carbon nanotube films using densification technique

Yu Dian Lim; Qinyu Kong; Shaomeng Wang; Chong Wei Tan; Beng Kang Tay; Sheel Aditya

doi:10.1016/j.apsusc.2017.11.005

Enhanced field emission properties of carbon nanotube films using densification technique

Yu Dian Lim, Qinyu Kong, Shaomeng Wang, Chong Wei Tan, Beng Kang Tay^*, Sheel Aditya

^*Corresponding author for this work

Nanyang Technological University

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

19 Citations (Scopus)

Abstract

It has been reported that Carbon Nanotubes (CNTs) films show much lower Field Emission (FE) current density than single CNT, due to the screening effect between CNTs. To minimize the screening effect, a widely-reported technique is to grow CNTs in isolated islands to form CNT arrays, which requires precise photolithography technique and CNT growth control. In this study, we demonstrate a simpler alternative to reduce the screening effect in CNT films using ethanol-densification. To perform densification, ethanol is dripped onto CNT films and dried in ambient condition to form CNT clusters. Densified CNT films show 2–4 times improvement in FE current density. This improvement in current density can be attributed to the enhanced localized electric field on CNT tips, as suggested by the simulation results. From the repeated densification and FE measurements, it is found that densified CNT films achieved consistent current density of 9 ∼ 11 mA/cm². At the same time, densified CNT film exhibits good FE current stability over prolonged continuous emission, with slight degradation from ∼10 to ∼9.64 mA/cm² over 4000 s continuous emission.

Original language	English
Pages (from-to)	211-219
Number of pages	9
Journal	Applied Surface Science
Volume	477
DOIs	https://doi.org/10.1016/j.apsusc.2017.11.005
Publication status	Published - May 31 2019
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2017

ASJC Scopus Subject Areas

General Chemistry
Condensed Matter Physics
General Physics and Astronomy
Surfaces and Interfaces
Surfaces, Coatings and Films

Keywords

Carbon nanotubes
Densification
Field emission
Screening effect

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10.1016/j.apsusc.2017.11.005

Cite this

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abstract = "It has been reported that Carbon Nanotubes (CNTs) films show much lower Field Emission (FE) current density than single CNT, due to the screening effect between CNTs. To minimize the screening effect, a widely-reported technique is to grow CNTs in isolated islands to form CNT arrays, which requires precise photolithography technique and CNT growth control. In this study, we demonstrate a simpler alternative to reduce the screening effect in CNT films using ethanol-densification. To perform densification, ethanol is dripped onto CNT films and dried in ambient condition to form CNT clusters. Densified CNT films show 2–4 times improvement in FE current density. This improvement in current density can be attributed to the enhanced localized electric field on CNT tips, as suggested by the simulation results. From the repeated densification and FE measurements, it is found that densified CNT films achieved consistent current density of 9 ∼ 11 mA/cm2. At the same time, densified CNT film exhibits good FE current stability over prolonged continuous emission, with slight degradation from ∼10 to ∼9.64 mA/cm2 over 4000 s continuous emission.",

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author = "Lim, {Yu Dian} and Qinyu Kong and Shaomeng Wang and Tan, {Chong Wei} and Tay, {Beng Kang} and Sheel Aditya",

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doi = "10.1016/j.apsusc.2017.11.005",

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AU - Lim, Yu Dian

AU - Kong, Qinyu

AU - Wang, Shaomeng

AU - Tan, Chong Wei

AU - Tay, Beng Kang

AU - Aditya, Sheel

PY - 2019/5/31

Y1 - 2019/5/31

N2 - It has been reported that Carbon Nanotubes (CNTs) films show much lower Field Emission (FE) current density than single CNT, due to the screening effect between CNTs. To minimize the screening effect, a widely-reported technique is to grow CNTs in isolated islands to form CNT arrays, which requires precise photolithography technique and CNT growth control. In this study, we demonstrate a simpler alternative to reduce the screening effect in CNT films using ethanol-densification. To perform densification, ethanol is dripped onto CNT films and dried in ambient condition to form CNT clusters. Densified CNT films show 2–4 times improvement in FE current density. This improvement in current density can be attributed to the enhanced localized electric field on CNT tips, as suggested by the simulation results. From the repeated densification and FE measurements, it is found that densified CNT films achieved consistent current density of 9 ∼ 11 mA/cm2. At the same time, densified CNT film exhibits good FE current stability over prolonged continuous emission, with slight degradation from ∼10 to ∼9.64 mA/cm2 over 4000 s continuous emission.

AB - It has been reported that Carbon Nanotubes (CNTs) films show much lower Field Emission (FE) current density than single CNT, due to the screening effect between CNTs. To minimize the screening effect, a widely-reported technique is to grow CNTs in isolated islands to form CNT arrays, which requires precise photolithography technique and CNT growth control. In this study, we demonstrate a simpler alternative to reduce the screening effect in CNT films using ethanol-densification. To perform densification, ethanol is dripped onto CNT films and dried in ambient condition to form CNT clusters. Densified CNT films show 2–4 times improvement in FE current density. This improvement in current density can be attributed to the enhanced localized electric field on CNT tips, as suggested by the simulation results. From the repeated densification and FE measurements, it is found that densified CNT films achieved consistent current density of 9 ∼ 11 mA/cm2. At the same time, densified CNT film exhibits good FE current stability over prolonged continuous emission, with slight degradation from ∼10 to ∼9.64 mA/cm2 over 4000 s continuous emission.

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KW - Screening effect

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Enhanced field emission properties of carbon nanotube films using densification technique

Abstract

Bibliographical note

ASJC Scopus Subject Areas

Keywords

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