Size- and temperature-dependent structural transitions in gold nanoparticles

2020-01-30 18:22:47

Gold structural nanoparticles dependent Morphology

责任者: Koga, K.;Ikeshoji, T.;Sugawara, K. 单位: Nanotechnology Res. Inst., Nat. Inst. of Adv. Ind. Sci. & Technol., Ibaraki, Japan 来源出处: Physical Review Letters(Phys. Rev. Lett. (USA)),2004/03/19,92(11):115507-1 摘要: Size- and temperature-dependent structural transitions in gold nanoparticles were revealed with morphology statistics obtained by high-resolution electron microscopic observations for thousands of particles annealed in a helium heat bath. We found that gold nanoparticles over a wide size range, 3-14 nm, undergo a structural transformation from icosahedral to decahedral morphology just below the melting points. It was also clarified that the formation of bulk crystalline structures from the decahedral morphology requires the melt-freeze process due to an insurmountable high free-energy barrier 关键词: annealing;gold;nanoparticles;solid-state phase transformations;temperature-dependent structural transitions;size-dependent structural transitions;Au nanoparticles;morphology statistics;icosahedral to decahedral morphology;melting points;3 to 14 nm;Au