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

2014; American Institute of Physics; Volume: 116; Issue: 11 Linguagem: Inglês

10.1063/1.4895834

1520-8850

Aditya P. Murawala, Tamie A. J. Loh, Daniel H. C. Chua,

MXene and MAX Phase Materials

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.