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Title: Synthesis of MoS₂ nano-petal forest supported on carbon nanotubes for enhanced field emission performance

We report the fabrication of a three-dimensional forest of highly crystalline two-dimensional (2D) molybdenum disulfide (MoS₂) nano-petals encapsulating vertically aligned carbon nanotubes (CNT) in a core-shell configuration. Growth was conducted via magnetron sputtering at room temperature and it was found that the nano-petal morphology was formed only when a critical threshold in sputter deposition time was reached. Below this threshold, an amorphous tubular structure composed of mainly molybdenum oxides dominates instead. The presence of the MoS₂ nano-petals was shown to impart photoluminescence to the CNTs, in addition to significantly enhancing their electron emission properties, where the turn-on field was lowered from 2.50 Vμm⁻¹ for pristine CNTs to 0.80 Vμm⁻¹ for MoS₂-CNT heterostructures fabricated at 30 min sputter deposition time. Photoluminescence was detected at wavelengths of approximately 684 nm and 615 nm, with the band at 684 nm gradually blue-shifting as sputter time was increased. These results demonstrate that it is possible to synthesize 2D MoS₂ layers without the need for chemical routes and high growth temperatures.
Authors:
; ;  [1]
  1. Department of Materials Science and Engineering, National University of Singapore, Singapore 117576 (Singapore)
Publication Date:
OSTI Identifier:
22306014
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CARBON NANOTUBES; CONFIGURATION; CRYSTAL GROWTH; DEPOSITION; ELECTRON EMISSION; FABRICATION; FIELD EMISSION; LAYERS; MAGNETRONS; MOLYBDENUM OXIDES; MOLYBDENUM SULFIDES; PHOTOLUMINESCENCE; SPUTTERING; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K; TWO-DIMENSIONAL CALCULATIONS; WAVELENGTHS