Oxygen plasma assisted end-opening and field emission enhancement in vertically aligned multiwall carbon nanotubes

A Mathur, SS. Roy, KS Hazra, S Wadhwa, SC Ray, SK Mitra, DS Misra, JAD McLaughlin

Research output: Contribution to journalArticle

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Abstract

This paper highlights the changes in micro-structural and field emission properties of vertically aligned carbon nanotubes (VACNTs) via oxygen plasma treatment. We find that exposure of very low power oxygen plasma (6 W) at 13.56 MHz for 15-20 min, opens the tip of vertically aligned CNTs. Scanning electron microscopy and transmission electron microscopy images were used to identify the quality and micro-structural changes of the nanotube morphology and surfaces. Raman spectra showed that the numbers of defects were increased throughout the oxygen plasma treatment process. In addition, the hydrophobic nature of the VACNTs is altered significantly and the contact angle decreases drastically from 110°to 40°. It was observed that the electron field emission (EFE) characteristics are significantly enhanced. The turn-on electric field (ETOE) of CNTs decreased from ?0.80 V ?m -1 (untreated) to ?0.60 V ?m -1 (oxygen treated). We believe that the open ended VACNTs would be immensely valuable for applications such as micro/nanofluidic based filtering elements and display devices. © 2012 Elsevier B.V. All rights reserved
LanguageEnglish
Pages425
JournalMaterials Chemistry and Physics
Volume134
Issue number1
DOIs
Publication statusPublished - 2012

Fingerprint

Carbon Nanotubes
oxygen plasma
Field emission
field emission
Carbon nanotubes
carbon nanotubes
Oxygen
Plasmas
augmentation
Nanofluidics
Nanotubes
Contact angle
Raman scattering
display devices
Display devices
electron emission
Electric fields
Transmission electron microscopy
nanotubes
Defects

Cite this

Mathur, A ; Roy, SS. ; Hazra, KS ; Wadhwa, S ; Ray, SC ; Mitra, SK ; Misra, DS ; McLaughlin, JAD. / Oxygen plasma assisted end-opening and field emission enhancement in vertically aligned multiwall carbon nanotubes. In: Materials Chemistry and Physics. 2012 ; Vol. 134, No. 1. pp. 425.
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abstract = "This paper highlights the changes in micro-structural and field emission properties of vertically aligned carbon nanotubes (VACNTs) via oxygen plasma treatment. We find that exposure of very low power oxygen plasma (6 W) at 13.56 MHz for 15-20 min, opens the tip of vertically aligned CNTs. Scanning electron microscopy and transmission electron microscopy images were used to identify the quality and micro-structural changes of the nanotube morphology and surfaces. Raman spectra showed that the numbers of defects were increased throughout the oxygen plasma treatment process. In addition, the hydrophobic nature of the VACNTs is altered significantly and the contact angle decreases drastically from 110°to 40°. It was observed that the electron field emission (EFE) characteristics are significantly enhanced. The turn-on electric field (ETOE) of CNTs decreased from ?0.80 V ?m -1 (untreated) to ?0.60 V ?m -1 (oxygen treated). We believe that the open ended VACNTs would be immensely valuable for applications such as micro/nanofluidic based filtering elements and display devices. {\circledC} 2012 Elsevier B.V. All rights reserved",
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Oxygen plasma assisted end-opening and field emission enhancement in vertically aligned multiwall carbon nanotubes. / Mathur, A; Roy, SS.; Hazra, KS; Wadhwa, S; Ray, SC; Mitra, SK; Misra, DS; McLaughlin, JAD.

In: Materials Chemistry and Physics, Vol. 134, No. 1, 2012, p. 425.

Research output: Contribution to journalArticle

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T1 - Oxygen plasma assisted end-opening and field emission enhancement in vertically aligned multiwall carbon nanotubes

AU - Mathur, A

AU - Roy, SS.

AU - Hazra, KS

AU - Wadhwa, S

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AU - Mitra, SK

AU - Misra, DS

AU - McLaughlin, JAD

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N2 - This paper highlights the changes in micro-structural and field emission properties of vertically aligned carbon nanotubes (VACNTs) via oxygen plasma treatment. We find that exposure of very low power oxygen plasma (6 W) at 13.56 MHz for 15-20 min, opens the tip of vertically aligned CNTs. Scanning electron microscopy and transmission electron microscopy images were used to identify the quality and micro-structural changes of the nanotube morphology and surfaces. Raman spectra showed that the numbers of defects were increased throughout the oxygen plasma treatment process. In addition, the hydrophobic nature of the VACNTs is altered significantly and the contact angle decreases drastically from 110°to 40°. It was observed that the electron field emission (EFE) characteristics are significantly enhanced. The turn-on electric field (ETOE) of CNTs decreased from ?0.80 V ?m -1 (untreated) to ?0.60 V ?m -1 (oxygen treated). We believe that the open ended VACNTs would be immensely valuable for applications such as micro/nanofluidic based filtering elements and display devices. © 2012 Elsevier B.V. All rights reserved

AB - This paper highlights the changes in micro-structural and field emission properties of vertically aligned carbon nanotubes (VACNTs) via oxygen plasma treatment. We find that exposure of very low power oxygen plasma (6 W) at 13.56 MHz for 15-20 min, opens the tip of vertically aligned CNTs. Scanning electron microscopy and transmission electron microscopy images were used to identify the quality and micro-structural changes of the nanotube morphology and surfaces. Raman spectra showed that the numbers of defects were increased throughout the oxygen plasma treatment process. In addition, the hydrophobic nature of the VACNTs is altered significantly and the contact angle decreases drastically from 110°to 40°. It was observed that the electron field emission (EFE) characteristics are significantly enhanced. The turn-on electric field (ETOE) of CNTs decreased from ?0.80 V ?m -1 (untreated) to ?0.60 V ?m -1 (oxygen treated). We believe that the open ended VACNTs would be immensely valuable for applications such as micro/nanofluidic based filtering elements and display devices. © 2012 Elsevier B.V. All rights reserved

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