Ilari Gabriele M, Hage Fredrik S, Zhang Yucheng, Rossell Marta D, Ramasse Quentin M, Niederberger Markus, Erni Rolf
Electron Microscopy Center, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland; Laboratory for Multifunctional Materials, Department of Materials, ETH Zürich, Wolfgang-Pauli-Strasse 10, CH-8093 Zürich, Switzerland.
SuperSTEM Laboratory, STFC Daresbury Campus, Keckwick Lane, Daresbury WA4 4AD, UK.
Micron. 2015 May;72:52-8. doi: 10.1016/j.micron.2015.03.004. Epub 2015 Mar 18.
Experimental confirmation for the stronger interaction of Ni with multi-walled carbon nanotubes (MWCNTs) compared to Cu with MWCNTs is presented. The interfaces between Cu (Ni) nanoparticles side-on oriented onto MWCNTs are analyzed with high spatial resolution electron energy-loss spectroscopy (EELS) of the carbon K-edge. The EEL spectra reveal a rehybridization from sp(2) to sp(3) hybridized carbon of the outermost MWCNT layer at the Ni interface, but no such rehybridization can be observed at the Cu interface. The EELS results are supported by transmission electron microscopy (TEM) images, which show a better wetting behavior of Ni and a smaller gap at the Ni-MWCNT interface, as compared to the corresponding Cu interfaces. The different behavior of Cu and Ni can be explained in terms of differing valence d-orbital occupancy. For the successful experimental demonstration of this effect the use of a soft chemical metal deposition technique is crucial.
本文给出了镍与多壁碳纳米管（MWCNT）之间的相互作用比铜与MWCNT之间的相互作用更强的实验证实。通过对碳K边进行高空间分辨率电子能量损失谱（EELS）分析了侧面取向于MWCNT上的铜（镍）纳米颗粒之间的界面。电子能量损失谱揭示了在镍界面处最外层MWCNT层的碳从sp(2)杂化到sp(3)杂化的重新杂化，但在铜界面处未观察到这种重新杂化。EELS结果得到了透射电子显微镜（TEM）图像的支持，与相应的铜界面相比，TEM图像显示镍具有更好的润湿性，且镍-MWCNT界面处的间隙更小。铜和镍的不同行为可以用不同的价d轨道占据情况来解释。对于该效应的成功实验证明，使用软化学金属沉积技术至关重要。
