Open Access
Research Article

Nano Research

, Volume 1, Issue 4, pp 333-340

Two distinct fluorescent quantum clusters of gold starting from metallic nanoparticles by pH-dependent ligand etching

Authors

  • Madathumpady Abubaker Habeeb Muhammed
    • DST Unit on Nanoscience (DST UNS), Department of Chemistry and Sophisticated Analytical Instrument FacilityIndian Institute of Technology Madras
  • Subramani Ramesh
    • DST Unit on Nanoscience (DST UNS), Department of Chemistry and Sophisticated Analytical Instrument FacilityIndian Institute of Technology Madras
  • Sudarson Sekhar Sinha
    • Unit for Nanoscience and Technology, Department of Chemical, Biological and Macromolecular SciencesSatyendra Nath Bose National Centre for Basic Sciences
  • Samir Kumar Pal
    • Unit for Nanoscience and Technology, Department of Chemical, Biological and Macromolecular SciencesSatyendra Nath Bose National Centre for Basic Sciences
  • Thalappil Pradeep
    • DST Unit on Nanoscience (DST UNS), Department of Chemistry and Sophisticated Analytical Instrument FacilityIndian Institute of Technology Madras

DOI: 10.1007/s12274-008-8035-2

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.

https://static-content.springer.com/image/art%3A10.1007%2Fs12274-008-8035-2/MediaObjects/12274_2008_8035_Fig1_HTML.jpg

Keywords

Gold cluster glutathione pH ligand etching fluorescence

Supplementary material

12274_2008_8035_MOESM1_ESM.pdf (661 kb)
Supplementary material, approximately 664 KB.

Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2008