Muhammed, Madathumpady Abubaker Habeeb ; Verma, Pramod Kumar ; Pal, Samir Kumar ; Arun Kumar, R. C. ; Paul, Soumya ; Omkumar, Ramakrishnapillai Vyomakesannair ; Pradeep, Thalappil (2009) Bright, NIR-emitting Au23 from Au25: characterization and applications including biolabeling Chemistry: A European Journal, 15 (39). pp. 10110-10120. ISSN 0947-6539
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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/chem.20...
Related URL: http://dx.doi.org/10.1002/chem.200901425
Abstract
A novel interfacial route has been developed for the synthesis of a bright-red-emitting new subnanocluster, Au23, by the core etching of a widely explored and more stable cluster, Au25SG18 (in which SG is glutathione thiolate). A slight modification of this procedure results in the formation of two other known subnanoclusters, Au22 and Au33. Whereas Au22 and Au23 are water soluble and brightly fluorescent with quantum yields of 2.5 and 1.3 %, respectively, Au33 is organic soluble and less fluorescent, with a quantum yield of 0.1 %. Au23 exhibits quenching of fluorescence selectively in the presence of Cu2+ ions and it can therefore be used as a metal-ion sensor. Aqueous- to organic-phase transfer of Au23 has been carried out with fluorescence enhancement. Solvent dependency on the fluorescence of Au23 before and after phase transfer has been studied extensively and the quantum yield of the cluster varies with the solvent used. The temperature response of Au23 emission has been demonstrated. The inherent fluorescence of Au23 was used for imaging human hepatoma cells by employing the avidin-biotin interaction.
Item Type: | Article |
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Source: | Copyright of this article belongs to John Wiley and Sons, Inc. |
Keywords: | Core Etching; Fluorescence; Gold; Nanostructures; Phase Transfer |
ID Code: | 27306 |
Deposited On: | 10 Dec 2010 12:48 |
Last Modified: | 17 May 2016 10:31 |
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