Grain size effects in polycrystalline gold nanoparticles.

Grain size effects in polycrystalline gold nanoparticles.
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DOI:
10.1039/c2nr30212h
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发表时间:
2012-07-21
期刊:
影响因子:
6.7
通讯作者:
Zheng J
Zheng J
中科院分区:
材料科学2区
文献类型:
--
作者:
Zhou C;Yu J;Qin Y;Zheng J

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我们报告了金纳米粒子(NPs)的结构-性质关系,即晶粒尺寸效应,它不仅允许在不同特征长度尺度上观察到的材料性质在单个NP中进行工程设计,而且由于不同尺寸晶粒之间的耦合而进一步增强了这些性质。晶粒尺寸效应是通过创建多晶金纳米粒子(pAuNPs)与两个不同的晶粒尺寸群体(5和1纳米)可比的电子平均自由程和电子费米波长(EFW)分别。成功地将分子和等离子体性质整合到单个纳米结构中而无需额外的荧光团,使得这些高度多晶的AuNP能够在各种光学显微成像技术中用作多模态探针。
We report a structure-property relationship in gold nanoparticles (NPs), grain-size effects, which not only allow material properties observed on different characteristic length scales to be engineered in a single NP but further enhance those properties due to the coupling among different-size grains. The grain size effects were achieved by creating polycrystalline gold NPs (pAuNPs) with two distinct grain-size populations (5 and 1 nm) comparable to electron mean free path and electron Fermi wavelength (EFW) respectively. Successful integration of molecular and plasmonic properties into a single nanostructure without additional fluorophores enables these highly polycrystalline AuNPs to serve as multimodal probes in a variety of optical microscopic imaging techniques.
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