کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
702748 | 891108 | 2009 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Production of single crystal diamond needles by a combination of CVD growth and thermal oxidation Production of single crystal diamond needles by a combination of CVD growth and thermal oxidation](/preview/png/702748.png)
Single crystal diamond needles were produced by combining chemical vapor deposition of a thin polycrystalline diamond film and its subsequent thermal oxidation. The deposition process has been carried out in a direct discharge activated hydrogen–methane gas mixture with parameters providing (100) textured diamond film growth. The oxidation has been performed by heating the deposited film in an air atmosphere with a temperature allowing the selective etching of the smallest fraction of the diamond crystallites in the film. As a result of this procedure, perfectly shaped micrometer sized single crystal diamond pyramids were obtained. The pyramids have a rectangular base plane with an apex tip curvature radius of about 2 to 10 nm. The atomic structure of the pyramids was established using high resolution transmission electron microscopy. We propose a model explaining the mechanism of the pyramids' formation.
Journal: Diamond and Related Materials - Volume 18, Issue 10, October 2009, Pages 1289–1293