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J Colloid Interface Sci. 2013 Jul 15;402:86-9. doi: 10.1016/j.jcis.2013.04.012. Epub 2013 Apr 22.

The enhancement of electron-phonon coupling in glutathione-protected Au25 clusters.

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1
Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan, China.

Abstract

Glutathione-protected Au25 clusters (Au25@GSH) are prospective for biological applications due to their biocompatibility and near infrared fluorescence. The weak electron-phonon coupling, however, restricts their applications in bioanalysis and therapeutics. Here we modify the properties of Au25@GSH by changing their ligands. The temperature dependent fluorescence shows that conjugation with different ligands results in modified temperature behavior. In particular, Au25@GSH-MPA evidently exhibits enhanced phonon coupling, therefore, resulting in a decrease in the emission energy and an increase in bandwidth upon increasing temperatures. The enhanced phonon coupling in modified Au25@GSH sheds new light on the future application of nanoclusters from early diagnosis towards therapeutics.

PMID:
23664390
DOI:
10.1016/j.jcis.2013.04.012
[Indexed for MEDLINE]
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