Field-emission properties of sulfur chain-encapsulated single-walled carbon nanotubes

Jonghee Yang, Jongtaek Lee, Junyoung Lee, Whikun Yi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The encapsulation of elemental sulfur inside single-walled carbon nanotube (SWNT) and the consequent formation of sulfur chain-encapsulated SWNT (S@SWNT) is achieved. Raman spectra suggest an enhanced conductivity and electron doping of the SWNT by the sulfur chain encapsulation, which are also consistent with ultraviolet photoelectron spectra and thermoelectric measurements. Owing to the enhanced electron concentration and the reduced work function, an enhanced field-emission (FE) current is observed for S@SWNT. In addition, a gradual recovery of the suppressed FE current is observed for S@SWNT after the O2 purging in the chamber is terminated, while the permanent failure of FE is observed for the pristine SWNT. Further experimental results collectively demonstrate that the enhanced electron concentration of the relatively n-doped SWNT by sulfur chain encapsulation alleviates the damage inflicted to the emitter tip sites from the oxidative environment generated during FE measurement.

Original languageEnglish
Article number107554
JournalDiamond and Related Materials
Volume101
DOIs
StatePublished - 2020 Jan

Fingerprint

Single-walled carbon nanotubes (SWCN)
Sulfur
Field emission
Encapsulation
Electrons
Purging
Photoelectrons
Raman scattering
Doping (additives)
Recovery

Keywords

  • Atomic encapsulation
  • Charge transfer
  • Field-emission
  • Single-walled carbon nanotube
  • Sulfur

Cite this

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title = "Field-emission properties of sulfur chain-encapsulated single-walled carbon nanotubes",
abstract = "The encapsulation of elemental sulfur inside single-walled carbon nanotube (SWNT) and the consequent formation of sulfur chain-encapsulated SWNT (S@SWNT) is achieved. Raman spectra suggest an enhanced conductivity and electron doping of the SWNT by the sulfur chain encapsulation, which are also consistent with ultraviolet photoelectron spectra and thermoelectric measurements. Owing to the enhanced electron concentration and the reduced work function, an enhanced field-emission (FE) current is observed for S@SWNT. In addition, a gradual recovery of the suppressed FE current is observed for S@SWNT after the O2 purging in the chamber is terminated, while the permanent failure of FE is observed for the pristine SWNT. Further experimental results collectively demonstrate that the enhanced electron concentration of the relatively n-doped SWNT by sulfur chain encapsulation alleviates the damage inflicted to the emitter tip sites from the oxidative environment generated during FE measurement.",
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Field-emission properties of sulfur chain-encapsulated single-walled carbon nanotubes. / Yang, Jonghee; Lee, Jongtaek; Lee, Junyoung; Yi, Whikun.

In: Diamond and Related Materials, Vol. 101, 107554, 01.2020.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Field-emission properties of sulfur chain-encapsulated single-walled carbon nanotubes

AU - Yang, Jonghee

AU - Lee, Jongtaek

AU - Lee, Junyoung

AU - Yi, Whikun

PY - 2020/1

Y1 - 2020/1

N2 - The encapsulation of elemental sulfur inside single-walled carbon nanotube (SWNT) and the consequent formation of sulfur chain-encapsulated SWNT (S@SWNT) is achieved. Raman spectra suggest an enhanced conductivity and electron doping of the SWNT by the sulfur chain encapsulation, which are also consistent with ultraviolet photoelectron spectra and thermoelectric measurements. Owing to the enhanced electron concentration and the reduced work function, an enhanced field-emission (FE) current is observed for S@SWNT. In addition, a gradual recovery of the suppressed FE current is observed for S@SWNT after the O2 purging in the chamber is terminated, while the permanent failure of FE is observed for the pristine SWNT. Further experimental results collectively demonstrate that the enhanced electron concentration of the relatively n-doped SWNT by sulfur chain encapsulation alleviates the damage inflicted to the emitter tip sites from the oxidative environment generated during FE measurement.

AB - The encapsulation of elemental sulfur inside single-walled carbon nanotube (SWNT) and the consequent formation of sulfur chain-encapsulated SWNT (S@SWNT) is achieved. Raman spectra suggest an enhanced conductivity and electron doping of the SWNT by the sulfur chain encapsulation, which are also consistent with ultraviolet photoelectron spectra and thermoelectric measurements. Owing to the enhanced electron concentration and the reduced work function, an enhanced field-emission (FE) current is observed for S@SWNT. In addition, a gradual recovery of the suppressed FE current is observed for S@SWNT after the O2 purging in the chamber is terminated, while the permanent failure of FE is observed for the pristine SWNT. Further experimental results collectively demonstrate that the enhanced electron concentration of the relatively n-doped SWNT by sulfur chain encapsulation alleviates the damage inflicted to the emitter tip sites from the oxidative environment generated during FE measurement.

KW - Atomic encapsulation

KW - Charge transfer

KW - Field-emission

KW - Single-walled carbon nanotube

KW - Sulfur

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