Modification of ultrananocrystalline diamond film microstructure via Fe-coating and annealing for enhancement of electron field emission properties
作者： Kuang-Yau Teng , Wen-Ching Shih , Pin-Chang Huang , Huang-Chin Chen , Chen-Yau Tang
DOI: 10.1063/1.4739772
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摘要: The interaction between Fe-coatings and ultrananocrystalline diamond (UNCD) films during annealing was investigated in detail using transmission electron microscopy. thin Fe-coating first formed nanosized Fe-clusters then catalytically dissociated the diamond, re-precipitating carbon to form graphite clusters. These clusters conducting networks that facilitated transport greatly improved field emission (EFE) properties of UNCD films. extent enhancement varied markedly with temperature atmosphere. For H2-annealed films, EFE behavior optimized by at 900 °C. turned on (E0)H2 = 1.2 V/μm, attaining current density (Je)H2 = 772.0 μA/cm2 an applied 8.8 V/mm. characteristics were superior those NH3-annealed 850 °C. inferior for samples attributed reaction NH3 hydrocarbon phase encapsulated diamon...
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