Interpretation of the Raman spectra of ultrananocrystalline diamond

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• 作者：Birrell ; James ; Gerbi ; J.E. ; Auciello ; O. ; Gibson ; J.M. ; Johnson ; J. ; Carlisle ; J.A.
• 关键词：Nanocrystalline ; Diamond film ; Vibrational properties characterization
• 刊名：Diamond and Related Materials
• 出版年：2005
• 期刊代码：30_09259635
• 类别：ms
• 出版时间：January, 2005
• 卷：14
• 期：1
• 页码：86-92
• 文件大小：619 K

摘要

It has long been known that by slightly altering the deposition conditions for diamond in plasma-enhanced chemical vapor deposition (PECVD), a transition from a microcrystalline to a nanocrystalline diamond morphology can be affected. The method of this transition, however, is not clear. This work investigates that transition by using transmission electron microscopy (TEM), scanning electron microscopy (SEM), and Raman spectroscopy. These experiments show that far from being a continuous transition, there is competitive growth between microcrystalline and nanocrystalline diamonds. Additionally, this work confirms the interpretation that certain peaks in the Raman spectrum previously attributed to 芒芒芒nanocrystalline diamond芒芒芒 are indeed due to the presence of hydrogen at the grain boundaries. For ultrananocrystalline diamond (UNCD) films, we verify that none of the spectral features observed using visible Raman spectroscopy can be attributed to sp³-bonded carbon, although the sample is composed of 芒芒芒95%sp³-bonded carbon. Thus, the Raman signal in UNCD can be considered to be solely due to the disordered sp²-bonded carbon at the grain boundaries.