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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/73499


    Title: Microstructure evolution and the modification of the electron field emission properties of diamond films by gigaelectron volt Au-ion irradiation
    Authors: Teng, Kuang-Yau;Chen, Huang-Chin;Tang, Chen-Yau;Sundaravel, Balakrishnan;Amirthapandian, Sankarakumar;Lin, I-Nan
    Contributors: 淡江大學物理學系
    Keywords: annealing;diamond;electron field emission;gold;grain boundaries;ion beam effects;ion implantation;solid-state phase transformations;thin films;transmission electron microscopy
    Date: 2011
    Issue Date: 2011-10-25 11:39:35 (UTC+8)
    Publisher: College Park: American Institute of Physics
    Abstract: The effect of 2.245 GeV Au-ion irradiation and post-annealing processes on the microstructure and electron field emission (EFE) properties of diamond films was investigated. For the microcrystalline diamond (MCD) films, Au-ion irradiation with a fluence of approximately 8.4×1013 ions/cm2 almost completely suppressed the EFE properties of the films. Post-annealing the Au-ion irradiated MCD films at 1000°C for 1 h effectively restored these properties. In contrast, for ultra-nanocrystalline diamond (UNCD) films, the Au-ion irradiation induced a large improvement in the EFE properties, and the post-annealing process slightly degraded the EFE properties of the films. The resulting EFE behavior was still better than that of pristine UNCD films. TEM examination indicated that the difference in Au-ion irradiation/post-annealing effects on the EFE properties of the MCD and UNCD films is closely related to the different phase transformation process involved. This difference is dependent on the different granular structures of these films. The MCD films with large-grain microstructure contain very few grain boundaries of negligible thickness, whereas the UNCD films with ultra-small-grain granular structure contain abundant grain boundaries of considerable thickness. Au-ion irradiation disintegrated the large grains in the MCD films into small diamond clusters embedded in an amorphous carbon (a-C) matrix that suppressed the EFE properties of the MCD films. In contrast, the Au-ion irradiation insignificantly altered the crystallinity of the grains of the UNCD films but transformed the grain boundary phase into nano-graphite, enhancing the EFE properties. The post-annealing process recrystallized the residual a-C phase into nano-graphites for both films.
    Relation: AIP Advances 1(4), 042108(22pages)
    DOI: 10.1063/1.3651462
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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