Size-reduction of nanodiamonds via air oxidation
Size-reduction of nanodiamonds via air oxidation
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DOI：
10.1016/j.diamond.2011.09.002
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发表时间：
2012-01-01
影响因子：
4.1
通讯作者：
Rabeau, J. R.
中科院分区：
文献类型：
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作者：
Gaebel, T.;Bradac, C.;Rabeau, J. R.
在这里，我们使用原子力和共聚焦显微镜报道了空气氧化对纳米金刚石中氮空位中心的尺寸减小和影响。通过原子力显微镜测量，单个晶体的平均高度在600℃时降低了10 +/- 1 nm/h，在550℃时降低了41 nm/h，在500℃时由于大气压力下的空气氧化而降低了不到1 nm/h。氧化过程修饰了表面，包括去除非金刚石碳和有机物质，这也导致了背景荧光的降低。在纳米金刚石尺寸减小的过程中，我们观察到氮空位中心的湮灭，这为小晶体中色中心的行为提供了重要的见解。在这些未辐照的样品中，最小的纳米金刚石仍然具有稳定的氮空位中心，观察到的是8纳米。(C) 2011 Elsevier B.V.版权所有
Here we report the size reduction and effects on nitrogen-vacancy centres in nanodiamonds by air oxidation using a combined atomic force and confocal microscope. The average height reduction of individual crystals, as measured by atomic force microscopy, was 10 +/- 1 nm/h at 600 degrees C, 4 1 nm/h at 550 degrees C, and less than 1 nm/h at 500 degrees C from air oxidation at atmospheric pressure. The oxidation process modified the surface including removal of non-diamond carbon and organic material which also led to a decrease in background fluorescence. During the course of the nanodiamond size reduction, we observed the annihilation of nitrogen-vacancy centres which provided important insight into the behaviour of colour centres in small crystals. In these unirradiated samples, the smallest nanodiamond still hosting a stable nitrogen-vacancy centre observed was 8 nm. (C) 2011 Elsevier B.V. All rights reserved.