期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 120, 期 49, 页码 28354-28362出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b10745
关键词
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资金
- UGC-DAE Consortium for Scientific Research, Indore, India
We have investigated the core issue of atomic lattices in monodispersed Ni nanoparticles (NPs) of sizes 3.8-10.1 nm using detailed analysis of X-ray diffraction, synchrotron radiation X-ray absorption spectroscopy, and magnetization data. This has revealed the very remarkable coexistence of atomic face-centered cubic (fcc) and hexagonal closed-packed (hcp) lattices in samples with particle size <= 6.0 nm with the prevalence of only fcc phase beyond this. They are also associated with reduced coordination number, modified electronic structure, and surface atom coordination with ligands. Magnetization data furthermore reveal the coexistence of ferromagnetism and superparamagnetism at 300 K. Considered to be due to dominant roles of ligands, they are likely to open up far-reaching implications to their future applications.
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