【资料】金纳米颗粒微观结构首次得到揭示

科学家首次揭示了金纳米颗粒的结构。（图片来源：Science）


研究人员发现，他们研究的金纳米颗粒由102个金原子和44个硫醇分子组成，其中，金原子排列成球状。三维高清图像表明，金纳米颗粒中心的原子排列与金块中相差无几。不过，该中心周围却环绕着两个“盖子”，每个都是由15个轻微扭曲的金原子组成。此外，与一些模型中预测硫醇分子团直接与金表面绑定不同，硫醇分子团会与最外层的金原子结成一体，它再与最中心金原子发生微弱的相互作用。

研究人员还注意到，金纳米颗粒是手性的，这与金原子和硫醇分子团的排列有关。

研究人员认为，新的研究有望最终打消人们对纳米颗粒及其毒性的疑虑。美国佐治亚理工学院的Robert Whetten表示，“如果一种物质的组成和结构得到确定，化学家可能会以截然不同的方式对其进行处理。这是一项应该被写入教科书的重要发现。”（科学网 任霄鹏/编译）

（《科学》（Science）Vol. 318. no. 5849, pp. 430 - 433，Pablo D. Jadzinsky，Roger D. Kornberg）

相关英文：


Reports
Structure of a Thiol Monolayer-Protected Gold Nanoparticle at 1.1 Å Resolution
Pablo D. Jadzinsky,1,2* Guillermo Calero,1* Christopher J. Ackerson,1 David A. Bushnell,1 Roger D. Kornberg1

Structural information on nanometer-sized gold particles has been limited, due in part to the problem of preparing homogeneous material. Here we report the crystallization and x-ray structure determination of a p-mercaptobenzoic acid (p-MBA)–protected gold nanoparticle, which comprises 102 gold atoms and 44 p-MBAs. The central gold atoms are packed in a Marks decahedron, surrounded by additional layers of gold atoms in unanticipated geometries. The p-MBAs interact not only with the gold but also with one another, forming a rigid surface layer. The particles are chiral, with the two enantiomers alternating in the crystal lattice. The discrete nature of the particle may be explained by the closing of a 58-electron shell.

1 Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305, USA.
2 Department of Applied Physics, Stanford University, Stanford, CA 94305, USA.

* These authors contributed equally to this work.

Present address: Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA.


To whom correspondence should be addressed. E-mail: kornberg@stanford.edu

我把全文贴上来

Structure of a Thiol Monolayer-Protected Gold Nanoparticle at 1.1 Å Resolution
Pablo D. Jadzinsky, Guillermo Calero, Christopher J. Ackerson, David A. Bushnell, and Roger D. Kornberg
Science 19 October 2007: 430-433

Science318-430


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赞啊，听说有吃钠米金的，是否为真？

多谢楼主和3楼的朋友,不知什么时候有皮为单位的金米颗粒.

顶了！！！！！！！！！