Nanocluster size evolution studied by mass spectrometry in room temperature Au25(SR)18 synthesis

Asantha C Dharmaratne; Thomas Krick; Amala Dass

doi:10.1021/ja906087a

Nanocluster size evolution studied by mass spectrometry in room temperature Au25(SR)18 synthesis

J Am Chem Soc. 2009 Sep 30;131(38):13604-5. doi: 10.1021/ja906087a.

Authors

Asantha C Dharmaratne¹, Thomas Krick, Amala Dass

Affiliation

¹ Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677, USA.

PMID: 19725520
DOI: 10.1021/ja906087a

Abstract

We show that MALDI mass spectrometry, suitable for mixtures, is an indispensable tool in probing the mechanism of nanocluster synthesis enabling positive identification of nanoclusters. The size evolution of the mixture of larger clusters (Au(102), Au(68), Au(38)) to form highly monodisperse Au(25) nanoclusters is demonstrated and probably includes the participation of Au(I) thiolate. The size evolution via structural reconstruction of the larger cores such as 38, approximately 44, 68, and 102 to a Au(25) nanocluster has been discussed.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Gold / chemistry*
Metal Nanoparticles / chemistry*
Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
Temperature

Substances

Gold