|
English
|
正體中文
|
简体中文
|
全文笔数/总笔数 : 62797/95867 (66%)
造访人次 : 3728649
在线人数 : 635
|
|
|
数据加载中.....
|
jsp.display-item.identifier=請使用永久網址來引用或連結此文件:
https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/27479
|
题名: | Growth, characterization, optical and X-ray absorption studies of nano-crystalline diamond films |
作者: | Chen, L. C.;Wang, T. Y.;Yang, J. R.;彭維鋒;Pong, W. F. |
贡献者: | 淡江大學物理學系 |
关键词: | Microwave CVD;Nano-diamond film;Optical transmittance;Transmission electron microscopy;X-ray absorption |
日期: | 2000-03-01 |
上传时间: | 2009-12-31 10:11:25 (UTC+8) |
出版者: | Elsevier |
摘要: | We report here the growth of thin diamond films, with an average grain size ranged from 3.6 nm to 5 μm, by microwave plasma enhanced chemical vapor deposition via different substrate pretreatment and varying methane fraction in the source gas. Specifically, the substrate pretreatment involved using two different grain sizes, 4 nm and 0.1 μm, of the diamond powder for ultrasonic agitation. Transmission electron microscopy, optical transmission spectra, and X-ray absorption spectra have been employed to characterize the resultant films. For each film, the grain size distribution was obtained by directly analyzing the dark-field images of the film. For films deposited with 0.1 μm diamond powder pretreatment, the grain size of the film decreased as the methane fraction increased. The opposite trend was observed for 4 nm diamond powder pretreated films. X-ray absorption spectra at the C K-edge showed clear bulk diamond excitonic and sp3 features with little evidence of sp2 bonding even for films with an average grain size as low as 3.6 nm. Furthermore, a blue shift of the exciton state and conduction band edge was observed with the decrease of the grain size of the film, indicating a quantum confinement effect. On the other hand, no direct relationship between the grain size of the film and the optical transmission was observed. The key parameter that dictated the optical transparency of the film was the surface roughness provided that the film maintained high sp3 content. |
關聯: | Diamond and Related Materials 9(3-6), pp.877-882 |
DOI: | 10.1016/S0925-9635(99)00355-6 |
显示于类别: | [物理學系暨研究所] 期刊論文
|
文件中的档案:
档案 |
大小 | 格式 | 浏览次数 |
index.html | 0Kb | HTML | 76 | 检视/开启 |
|
在機構典藏中所有的数据项都受到原著作权保护.
|