The Characteristics of the Atomic Structure and Morphology of the Ni-Cores in the Ni/Au Core–Shell Nanoparticles
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The Ni-nanoparticles, being similar to the nanocores of the Ni/Au core–shell nanoparticles, are made up of the structural domains with the dimensions about 1 nm. It is experimentally shown in this work for the first time by the combination of the small-angle X-ray scattering (SAXS) and the powder X-ray diffraction (XRD). The atomic structure of these domains is not a face-centered cubic lattice (FCC) inherent in the bulk state of Ni. This fact has been established by using the transmission electron microscopy (TEM) and XRD, calculated and confirmed by the observed features of an anodic oxidation and the differential scanning calorimetry (DSC) results for the investigated Ni-nanoparticles. Thus, the Ni-nanocores are composed of the domains with a structure formed by the icosahedra in the synthesis often used to obtain the core–shell nanoparticles.
KeywordsNi Nanoparticles Core Morphology Structure
The work is complete with the assistance of the comprehensive program of the FSI (Fundamental Scientific Investigations) of the Siberian Branch of the Russian Academy of Sciences (# АААА-А16-116122910066-3, V.45 project). The work has carried out using the research facilities of the FRC CCC SB RAS (The Analytical Scientific Centre of Carbonic material Composition and Structure, Kemerovo). The authors thank R.S. Islamov for linguistic support.
The manuscript was written through the contributions of all authors: YuZ wrote the article and made the general leadership of the work; RK wrote the article and its corresponding part, made all illustrations and calculations, prepared an English version of the manuscript; VP and VD took the XRD, and the SAXS measurements, and wrote the 5th part of the article; DR made the TEM experiments; IO made the synthesis of the Ni-NPs and the OAS experiments; IP made the XPS measurements; DY made the calculations of the XRD patterns; NI and NI made the electrochemical experiments; LH made the TMSA experiments. All authors have given approval to the final version of the manuscript.
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