Transformation of diamond nanoparticles into carbon onions under electron irradiation

Transformation of diamond nanoparticles into carbon onions under electron irradiation
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电子辐照下金刚石纳米颗粒转化为碳洋葱

DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
R. Schlögl
R. Schlögl
中科院分区：
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文献类型：
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作者：
V. Roddatis;V. Kuznetsov;Y. Butenko;D. Su;R. Schlögl

文献摘要

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利用高分辨率透射电镜（HRTEM）和电子能量损失谱（EELS）原位研究了金刚石纳米颗粒（DNP）辐照诱导转化为球形洋葱和洋葱样碳的过程。该过程在200 kV的透射电子显微镜下观察，没有额外的样品加热。估计电流密度在20-40 A cm−2之间。发现钻石形成的洋葱状粒子对进一步的电子照射相当稳定。EELS也证实了化学键的变化，揭示了sp2杂化键在辐照材料中的作用增加。讨论了结构转变的机理。
The irradiation-induced transformation of diamond nanoparticles (DNP) to spherical onions and onion-like carbon was studied in situ by high-resolution transmission electron microscopy (HRTEM) and electron energy loss spectroscopy (EELS). The process was observed in a transmission electron microscope operated at 200 kV without additional specimen heating. Estimated current density was in the range 20–40 A cm−2. The onion-like particles formed from the diamonds were found to be quite stable to further electron irradiation. The changes in chemical bonding were also confirmed by EELS, revealing an increasing role of bonds with sp2 hybridization in the irradiated material. The mechanism of structural transformation is discussed.