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论文期刊

论文标题    Energy Anisotropy of Bimetal Core-Shell Nanorods and Its Effects on Morphology
作者    Fei Ma, Shengli Ma, Kewei Xu and Paul K Chu
发表/完成日期    2007-09-06
期刊名称    Nanotechnology
期卷    18
相关文章   
论文简介    A thermodynamic analysis is presented in equilibrium state to fathom the morphology evolution of silver and palladium epilayers deposited on gold nanorods (GNRs). With regard to Ag epilayers on GNRs, the misfit strain has a considerably small value of 0.00244 and the stored strain energy is three orders of magnitude lower than the energy contribution from the surface and interface. Consequently, Ag epilayers are preferred on {111} facets at two ends of GNRs for surface and interface energy minimization, and promote the growth of dumbbell-shaped structures. The case is reverse for Pd epilayers on GNRs. The larger misfit strain of 0.04883 increases the strain energy to the same magnitude as surface and interfacial energies. Long-time growth of Pd epilayers is favored along the {100} side surfaces of GNRs for strain energy minimization, and rectangular core-shell nanorods emerge. This is consistent with relevant experimental results.
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