Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 4, Issue 10, Pages 2079-2087Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc03993b
Keywords
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Funding
- Shanghai Pujiang Program [14PJ1403600]
- National Natural Science Foundation of China [61176108]
- PCSIRT, Huaian Applied Research [HAG2014034]
- Research Innovation Foundation of ECNU [78210245]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- City University of Hong Kong [9667104]
- Guangdong-Hong Kong Technology Cooperation Funding Scheme (TCFS) [GHP/015/12SZ]
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An emission cell comprising multi-layer graphene (MLG) on nickel-coated silicon microchannel plates (Ni/Si-MCPs) was prepared. The Ni3C film was formed on the Si-MCPs by hydrothermal carburization in a polyol solution containing a small amount of NaAc as the carbon source and thermal annealing was performed to produce the vertically and horizontally aligned multi-layer graphene field-emission cathode on the surface of the Ni/Si-MCPs (MLG-MCPs). The microstructure and surface morphology were investigated and field emission (FE) studies indicated that the MLG-MCPs delivered better FE performance than Ni/Si-MCPs due to characteristics such as sharp edges, large aspect ratio, and the vertically and horizontally aligned and patterned MLG with good electrical conductivity. The turn-on field of the sample annealed at 800 degrees C was 2.0 V mu m(-1) at a current density of 10 mu A cm(-2) and the field emission threshold was 3.2 V mu m(-1) at 1 mA cm(-2). The structure was very stable showing 97.5% retention after continuous operation for over 6 h at 2 x 10(-5) Pa, suggesting a promising candidate for FE devices. This would open up possibilities for the next generation FE electron sources from well-aligned macroporous graphene with skeleton and extend their practical applications.
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