Towards graphane field emitters

Shuyi Ding, Matthew Cole, Chi Li, Yanhuai Zhou, Clare M. Collins, Moon H. Kang, Richard J. Parmee, Wei Lei, Xiaobing Zhang, Qing Dai, William I. Milne, Baoping Wang

Research output: Contribution to journalArticle

3 Citations (Scopus)
29 Downloads (Pure)

Abstract

We report on the improved field emission performance of graphene foam (GF) following transient exposure to hydrogen plasma. The enhanced field emission mechanism associated with hydrogenation has been investigated using Fourier transform infrared spectroscopy, plasma spectrophotometry, Raman spectroscopy, and scanning electron microscopy. The observed enhanced electron emissionhas been attributed to an increase in the areal density of lattice defects and the formation of a partially hydrogenated, graphane-like material. The treated GF emitter demonstrated a much reduced macroscopic turn-on field (2.5 V μm-1), with an increased maximum current density from 0.21 mA cm-2 (pristine) to 8.27 mA cm-2 (treated). The treated GFs vertically orientated protrusions, after plasma etching, effectively increased the local electric field resulting in a 2.2-fold reduction in the turn-on electric field. The observed enhancement is further attributed to hydrogenation and the subsequent formation of a partially hydrogenated structured 2D material, which advantageously shifts the emitter work function. Alongside augmentation of the nominal crystallite size of the graphitic superstructure, surface bound species are believed to play a key role in the enhanced emission. The hydrogen plasma treatment was also noted to increase the emission spatial uniformity, with an approximate four times reduction in the per unit area variation in emission current density. Our findings suggest that plasma treatments, and particularly hydrogen and hydrogen-containing precursors, may provide an efficient, simple, and low cost means of realizing enhanced nanocarbon-based field emission devices via the engineered degradation of the nascent lattice, and adjustment of the surface work function.

Original languageEnglish
Pages (from-to)105111-105118
Number of pages8
JournalRSC Advances
Volume5
Issue number127
DOIs
Publication statusPublished - 23 Nov 2015

Fingerprint

Hydrogen
Field emission
Plasmas
Graphite
Graphene
Hydrogenation
Foams
Current density
Electric fields
Plasma etching
Crystal defects
Spectrophotometry
Crystallite size
Crystal lattices
Fourier transform infrared spectroscopy
Raman spectroscopy
Degradation
Scanning electron microscopy
Electrons
Costs

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Ding, S., Cole, M., Li, C., Zhou, Y., Collins, C. M., Kang, M. H., ... Wang, B. (2015). Towards graphane field emitters. RSC Advances, 5(127), 105111-105118. https://doi.org/10.1039/c5ra20771a

Towards graphane field emitters. / Ding, Shuyi; Cole, Matthew; Li, Chi; Zhou, Yanhuai; Collins, Clare M.; Kang, Moon H.; Parmee, Richard J.; Lei, Wei; Zhang, Xiaobing; Dai, Qing; Milne, William I.; Wang, Baoping.

In: RSC Advances, Vol. 5, No. 127, 23.11.2015, p. 105111-105118.

Research output: Contribution to journalArticle

Ding, S, Cole, M, Li, C, Zhou, Y, Collins, CM, Kang, MH, Parmee, RJ, Lei, W, Zhang, X, Dai, Q, Milne, WI & Wang, B 2015, 'Towards graphane field emitters', RSC Advances, vol. 5, no. 127, pp. 105111-105118. https://doi.org/10.1039/c5ra20771a
Ding S, Cole M, Li C, Zhou Y, Collins CM, Kang MH et al. Towards graphane field emitters. RSC Advances. 2015 Nov 23;5(127):105111-105118. https://doi.org/10.1039/c5ra20771a
Ding, Shuyi ; Cole, Matthew ; Li, Chi ; Zhou, Yanhuai ; Collins, Clare M. ; Kang, Moon H. ; Parmee, Richard J. ; Lei, Wei ; Zhang, Xiaobing ; Dai, Qing ; Milne, William I. ; Wang, Baoping. / Towards graphane field emitters. In: RSC Advances. 2015 ; Vol. 5, No. 127. pp. 105111-105118.
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