Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 31, Pages 5331-5336Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201402448
Keywords
Layered compounds; Nanostructures; Vanadium; Sulfur; Density functional calculations; Field emission
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Funding
- Department of Science and Technology (DST), New Delhi [SR/S2/RJN-21/2012, SR/S2/RJN-130/2012, SB/FTP/PS-065/2013, SB/FT/CS-116/2013]
- University Grants Commission (UGC)-UKIERI [UGC-2013-14/005]
- DeitY
- MCIT, the Government of India
- NCL-MRP [MLP 028626]
- State of New York (Interconnect Focus Center, MARCO program)
- National Science Foundation (NSF)
- Integrative Graduate Education and Research Traineeship (IGERT) Program [0333314]
- NSF Petascale Simulations and Anaylsis (PetaApps) program [0749140]
- US Army Research Laboratory [W911NF-12-2-0023]
- State of New York
- Direct For Computer & Info Scie & Enginr
- Office of Advanced Cyberinfrastructure (OAC) [0749140] Funding Source: National Science Foundation
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We report first-principles DFT calculations of the single-layer VS2 work function, the experimental synthesis of flower-like few-layer-thick VS2 nanosheets by a simple one-step hydrothermal method, and the investigation of their field emission properties. The turn-on field required to draw emission current densities of 1 and 10 mu A/cm(2) were 4 and 5.01 V/mu m, respectively. The observed turn-on field values are attributed to the high field enhancement factor (ca. 2500), which is due to presence of sharp protrusions in the VS2 nanosheets. Furthermore, the field-emission current stability of the VS2 emitter shows stable behavior over a period of 12 h. Further, DFT calculations show that the work function (f) of the single-layer VS2 emitter is 6.01 eV.
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