Enhancement in Electron Field Emission of Microcrystalline Diamond Films upon Iron Coating and Annealing Processes
作者： Pin-Chang Huang , Wen-Ching Shih , Huang-Chin Chen , I-Nan Lin
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摘要: The electron field emission (EFE) properties of diamond films were markedly improved by Fe-coating and postannealing processes. Transmission microscopy examination indicated that the possible mechanism enhancing EFE behavior is reaction Fe layer with reprecipitation dissolved carbon species to form nanographite. Scanning micrographs showed coating first formed particles at 700 °C then reacted diamond, forming iron carbide (Fe3C) 800 °C. dissolution processes occurred simultaneously during process higher temperatures (800–950 °C), which leads formation amorphous when temperature low (800–850 °C) nanographite high (900–950 °C). 900 °C-postannealed exhibit best properties, can be turned on a E0=2.8 V/µm, attain an current density Je=21.4 µA/cm2 8 V/µm.
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