Phase formation, magnetic and optical properties of epitaxially grown icosahedral Au@Ni nanoparticles with ultrathin shells
文献情報
Lingfeng Huang, Zhipeng Li, Chinping Chen, Rongming Wang
The synergistic effect between the metallic elements in the core–shell nanostructures has attracted increasing interest. In the system of Au@Ni nanostructure, it is challenging to epitaxially grow Ni atoms on Au nanocrystals due to the large lattice mismatch. In this paper, Au@Ni core–shell nanostructures have been synthesized by a facile one-pot wet chemical method. The Ni shell is epitaxially grown on the (111) planes of the icosahedral Au cores. The diameter of the icosahedral Au core is about 10–20 nm and the thickness of the Ni shell is of only several nanometers, providing an ideal structure for the study of synergistic effect. The Curie temperature of the Ni shells is estimated to be lower than 400 K by the field-cooling/zero field-cooling M(T) measurements. It is suppressed considerably from that of the bulk phase, mainly attributed to the finite size effect. The optical properties of the Au@Ni core–shell nanostructures are studied by absorption spectroscopy. The spectral blue-shift tendency is consistent with the results described by the plasmon hybridization theory.
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CrystEngComm is the forum for the design and understanding of crystalline materials. We welcome studies on the investigation of molecular behaviour within crystals, control of nucleation and crystal growth, engineering of crystal structures, and construction of crystalline materials with tuneable properties and functions. We publish hypothesis-driven research into… how crystal design affects thermodynamics, phase transitional behaviours, polymorphism, morphology control, solid state reactivity (crystal-crystal solution-crystal, and gas-crystal reactions), optoelectronics, ferroelectric materials, non-linear optics, molecular and bulk magnetism, conductivity and quantum computing, catalysis, absorption and desorption, and mechanical properties. Using Techniques and methods including… Single crystal and powder X-ray, electron, and neutron diffraction, solid-state spectroscopy, spectrometry, and microscopy, modelling and data mining, and empirical, semi-empirical and ab-initio theoretical evaluations. On crystalline and solid-state materials. We particularly welcome work on MOFs, coordination polymers, nanocrystals, host-guest and multi-component molecular materials. We also accept work on peptides and liquid crystals. All papers should involve the use or development of a design or optimisation strategy. Routine structural reports or crystal morphology descriptions, even when combined with an analysis of properties or potential applications, are generally considered to be outside the scope of the journal and are unlikely to be accepted.










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