Microstructure evolution and the modification of the electron field emission properties of diamond films by gigaelectron volt Au-ion irradiation
學年 99
學期 1
出版（發表）日期 2011-01-01
作品名稱 Microstructure evolution and the modification of the electron field emission properties of diamond films by gigaelectron volt Au-ion irradiation
作品名稱（其他語言）
著者 Teng, Kuang-Yau; Chen, Huang-Chin; Tang, Chen-Yau; Sundaravel, Balakrishnan; Amirthapandian, Sankarakumar; Lin, I-Nan
單位 淡江大學物理學系
出版者 College Park: American Institute of Physics
著錄名稱、卷期、頁數 AIP Advances 1(4), 042108(22pages)
摘要 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.
關鍵字 annealing; diamond; electron field emission; gold; grain boundaries; ion beam effects; ion implantation; solid-state phase transformations; thin films; transmission electron microscopy
語言 en
ISSN 2158-3226
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 Lin, I-Nan
審稿制度
國別 USA
公開徵稿
出版型式 電子版
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