Enhanced field-emission behavior of layered MoS2 sheets

Ranjit V. Kashid, Dattatray J. Late, Stanley S. Chou, Yi Kai Huang, Mrinmoy De, Dilip S. Joag, Mahendra A. More*, Vinayak P. Dravid

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

174 Scopus citations

Abstract

Field emission studies are reported for the first time on layered MoS 2 sheets at the base pressure of ∼1 × 10-8 mbar. The turn-on field required to draw a field emission current density of 10 μA/cm2 is found to be 3.5 V/μm for MoS2 sheets. The turn-on values are found to be significantly lower than the reported MoS 2 nanoflowers, graphene, and carbon nanotube-based field emitters due to the high field enhancement factor (∼1138) associated with nanometric sharp edges of MoS2 sheet emitter surface. The emission current-time plots show good stability over a period of 3 h. Owing to the low turn-on field and planar (sheetlike) structure, the MoS2 could be utilized for future vacuum microelectronics/nanoelectronic and flat panel display applications. Field emission studies of few-layer MoS2 sheets show that the turn-on field required to draw a current density of 10 μA/cm 2 is 3.5 V/μm. The turn-on value is comparable with MoS 2 nanoflower-, graphene-, and carbon nanotube-based field emitters. The low turn-on field value is due to the high field-enhancement factor (∼1138) associated with the nanometric sharp edges of the MoS2 sheets. It is possible to orient the layered MoS2 sheets for achieving a higher field enhancement factor, resulting in a high current density obtainable at the lower field.

Original languageEnglish (US)
Pages (from-to)2730-2734
Number of pages5
JournalSmall
Volume9
Issue number16
DOIs
StatePublished - Aug 26 2013

Keywords

  • MoS
  • field emission
  • field enhancement factors
  • layered materials

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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