Carbon States in Carbon-Encapsulated Nickel Nanoparticles Studied by Means of X-ray Absorption, Emission, and Photoelectron Spectroscopies
Carbon States in Carbon-Encapsulated Nickel Nanoparticles Studied by Means of X-ray Absorption, Emission, and Photoelectron Spectroscopies
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DOI：
10.1021/jp2085846
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发表时间：
2011-12-22
影响因子：
3.7
通讯作者：
Boukhvalov, D. W.
中科院分区：
文献类型：
--
作者：
Galakhov, V. R.;Buling, A.;Boukhvalov, D. W.
利用光电子能谱、X射线吸收谱和X射线发射谱对碳包覆镍纳米粒子的电子结构进行了表征。实验谱与密度泛函理论计算的态密度进行了比较。已经发现Ni纳米颗粒的碳壳是具有显著量（约6%）的Stone Wales缺陷的多层石墨烯。实验结果证明，通过提供至少2年的抗氧化屏障，金属纳米颗粒免受环境降解的影响。在空气中暴露2年导致Ni@C纳米颗粒的碳壳仅被氧化，其具有官能团的覆盖。
The electronic structure of nickel nanoparticles encapsulated in carbon was characterized by photoelectron, X-ray absorption, and X-ray emission spectroscopies. Experimental spectra were compared with the density of states calculated in the frame of density functional theory. The carbon shell of Ni nanoparticles has been found to be multilayer graphene with a significant (about 6%) amount of Stone Wales defects. Results of the experiments evidence protection of the metallic nanoparticles from environmental degradation by providing a barrier against oxidation at least for 2 years. Exposure in air for 2 years leads to oxidation only of the carbon shell of Ni@C nanoparticles with coverage of functional groups.