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

Journal Article · Sun Sep 21 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4895834· OSTI ID:22306014

Murawala, Aditya P.; Loh, Tamie A. J.; Chua, Daniel H. C., ^[1]

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1. Department of Materials Science and Engineering, National University of Singapore, Singapore 117576 (Singapore)

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.

• OSTI ID: 22306014
• Journal Information: Journal of Applied Physics, Vol. 116, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

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