Two distinct fluorescent quantum clusters of gold starting from metallic nanoparticles by pH-dependent ligand etching |
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Authors: | Madathumpady Abubaker Habeeb Muhammed Subramani Ramesh Sudarson Sekhar Sinha Samir Kumar Pal Thalappil Pradeep |
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Affiliation: | (1) DST Unit on Nanoscience (DST UNS), Department of Chemistry and Sophisticated Analytical Instrument Facility, Indian Institute of Technology Madras, Chennai, 600 036, India;(2) Unit for Nanoscience and Technology, Department of Chemical, Biological and Macromolecular Sciences, Satyendra Nath Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata, 700 098, India |
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Abstract: | Two fluorescent quantum clusters of gold, namely Au25 and Au8, have been synthesized from mercaptosuccinic acid-protected gold nanoparticles of 4–5 nm core diameter by etching with excess glutathione. While etching at pH ∼3 yielded Au25, that at pH 7–8 yielded Au8. This is the first report of the synthesis of two quantum clusters starting from a single precursor. This simple method makes it possible to synthesize well-defined clusters in gram quantities. Since these clusters are highly fluorescent and are highly biocompatible due to their low metallic content, they can be used for diagnostic applications. Electronic Supplementary Material Supplementary material is available for this article at and is accessible for authorized users. This article is published with open access at Springerlink.com |
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Keywords: | Gold cluster glutathione pH ligand etching fluorescence |
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