二十面体对称
材料科学
纳米颗粒
形态学(生物学)
胶体金
化学物理
大气温度范围
退火(玻璃)
纳米技术
结晶学
热力学
复合材料
化学
遗传学
生物
物理
作者
Kenji Koga,Tamio Ikeshoji,Ko‐ichi Sugawara
标识
DOI:10.1103/physrevlett.92.115507
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.
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