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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/93421

    Title: Effects of high energy Au-ion irradiation on the microstructure of diamond films
    Authors: Chen, Shih-Show;Chen, Huang-Chin;Wang, Wei-Cheng;Lee, Chi-Young;Lin, I-Nan;Guo, Jinghua;Chang, Ching-Lin
    Contributors: 淡江大學物理學系
    Date: 2013-03
    Issue Date: 2014-01-10 09:48:56 (UTC+8)
    Publisher: College Park: American Institute of Physics
    Abstract: The effects of 2.245 GeV Au-ion irradiation and subsequent annealing processes on the evolution of microstructure of diamond films with microcrystalline (MCD) or ultra-nanocrystalline (UNCD) granular structure were investigated, using near edge x-ray absorption fine structure and electron energy loss spectroscopy in transmission electron microscopy. For MCD films, the Au-ion irradiation disintegrated some of the diamond grains, resulting in the formation of nano-sized carbon clusters embedded in a matrix of amorphous carbon (a-C). The annealing process recrystallized the diamond grains and converted the a-C into nano-sized graphite particulates and, at the same time, induced the formation of nano-sized i-carbon clusters, the bcc structured carbon with a0 = 0.432 nm. In contrast, for UNCD films, the Au-ion irradiation transformed the grain boundary phase into nano-sized graphite, but insignificantly altered the crystallinity of the grains of the UNCD films. The annealing process recrystallized the materials. In some of the regions, the residual a-C phases were transformed into nano-sized graphites, whereas in other regions i-carbon nanoclusters were formed. The difference in irradiation-induced microstructural transformation behavior between the MCD and the UNCD films is ascribed to the different granular structures of the two types of films.
    Relation: Journal of Applied Physics 113(11), 113704(10pages)
    DOI: 10.1063/1.4795507
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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