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Title: Ni-NiO core-shell nanoclusters with cubic shape by nanocluster beam deposition
Authors: Zhou, Y.Z.
Chen, J.S.
Tay, B.K.
Hu, J.F.
Chow, G.M.
Liu, T. 
Yang, P. 
Issue Date: 2007
Citation: Zhou, Y.Z., Chen, J.S., Tay, B.K., Hu, J.F., Chow, G.M., Liu, T., Yang, P. (2007). Ni-NiO core-shell nanoclusters with cubic shape by nanocluster beam deposition. Applied Physics Letters 90 (4) : -. ScholarBank@NUS Repository.
Abstract: Ni nanoclusters with cubic shape and uniform size below 10 nm were fabricated by nanocluster beam deposition. Ni-NiO core-shell structure was achieved when the Ni clusters flew through a chamber with constant oxygen feeding (1-3 SCCM, SCCM denotes cubic centimeter per minute at STP). The fraction of oxidized Ni was estimated by means of linear combination fitting to the x-ray absorption near-edge structure data. The hysteresis loop of the oxidized sample (1 SCCM O2) showed a shift of ∼181 Oe with 100 Oe field cooling from 400 K and a coercivity of 48 Oe at room temperature, while the nonoxidized Ni nanoclusters with size of 4-5 nm showed superparamagnetic behavior. © 2007 American Institute of Physics.
Source Title: Applied Physics Letters
ISSN: 00036951
DOI: 10.1063/1.2434165
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