用X射线吸收、发射和光电子能谱学研究碳包覆镍纳米颗粒中碳的状态
Carbon States in Carbon-Encapsulated Nickel Nanoparticles Studied by Means of X-Ray Absorption, Emission, and Photoelectron Spectroscopies
摘要：
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。实验谱与在密度泛函理论框架下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（约6%）量的斯通-威尔士缺陷的多层石墨烯。实验结果表明，通过提供至少两年的抗氧化屏障，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。
英文摘要：
Electronic structure of nickel nanoparticles encapsulated in carbon was characterized by photoelectron, X-ray absorption, and X-ray emission spectroscopies. Experimental spectra are compared with the density of states calculated in the frame of the density functional theory. The carbon shell of Ni nanoparticles has been found to be multilayer graphene with significant (about 6%) amount of Stone--Wales defects. Results of the experiments evidence protection of the metallic nanoparticles from the environmental degradation by providing a barrier against oxidation at least for two years. Exposure in air for 2 years leads to oxidation only of the carbon shell of Ni@C nanoparticles with coverage of functional groups.
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