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New breakthrough for structural characterization of metal nanoparticles

Date:
September 4, 2013
Source:
Academy of Finland
Summary:
Researchers have characterized a series of stable 1.5 nm metal nanoclusters containing 44 metal atoms, stabilized by 30 organic thiol molecules on the surface.
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Figure: Left: This shows the atomic-scale visualization of the nanoparticle structure with 44 metal sites and 30 thiols. Right: The inner metal core has two shells of 12 and 20 sites (golden and green, respectively), capped by six metal-thiol molecular complexes (one shown on top).
Credit: Sami Malola, University of Jyväskylä

Researchers at the Xiamen University in China and the University of Jyväskylä in Finland have characterized a series of stable 1.5 nm metal nanoclusters containing 44 metal atoms, stabilized by 30 organic thiol molecules on the surface.

Two types of clusters were synthesized, containing either 44 silver atoms or an intermetallic cluster of 12 gold and 32 silver atoms. The work in the University of Jyväskylä is funded by the Academy of Finland.

The special electronic structure of the clusters leads to peaked absorption of radiation in a wide region of ultraviolet and visible parts of the electromagnetic spectrum. These novel nanomaterials were synthesized first in 2009 by a group at MIT in the USA, but their atomic structure has not been known until now.

This is the first case of a very stable silver-based cluster nanomaterial that can be synthesized in a macroscopic scale, currently of the order of 10 grams from one synthesis. This material is expected to be widely studied for optical, sensing and electron-transfer applications in the future.

The results were reported online in Nature Communications on 4 September 2013.


Story Source:

The above story is based on materials provided by Academy of Finland. Note: Materials may be edited for content and length.


Journal Reference:

  1. Huayan Yang, Yu Wang, Huaqi Huang, Lars Gell, Lauri Lehtovaara, Sami Malola, Hannu Häkkinen, Nanfeng Zheng. All-thiol-stabilized Ag44 and Au12Ag32 nanoparticles with single-crystal structures. Nature Communications, 2013; 4 DOI: 10.1038/ncomms3422

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Academy of Finland. "New breakthrough for structural characterization of metal nanoparticles." ScienceDaily. ScienceDaily, 4 September 2013. <www.sciencedaily.com/releases/2013/09/130904105349.htm>.
Academy of Finland. (2013, September 4). New breakthrough for structural characterization of metal nanoparticles. ScienceDaily. Retrieved May 28, 2015 from www.sciencedaily.com/releases/2013/09/130904105349.htm
Academy of Finland. "New breakthrough for structural characterization of metal nanoparticles." ScienceDaily. www.sciencedaily.com/releases/2013/09/130904105349.htm (accessed May 28, 2015).

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