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Nanotechnology. 2008 Jan 23;19(3):035706. doi: 10.1088/0957-4484/19/03/035706. Epub 2007 Dec 13.

Fluorescence blinking dynamics of silver nanoparticle and silver nanorod films.

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  • 1Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637616, Singapore.

Abstract

Fluorescence blinking of silver nanoparticle films is observed when illuminated with red light (635 nm). The observed power-law off-time distribution is attributed to random surface diffusion and subsequent agglomeration of atomic Ag leading to the formation of photo-active Ag nanoclusters. These nanoclusters can in turn diffuse randomly to form non-emitting Ag clusters after aggregation with another Ag species. This is revealed in the power-law on-time distribution. Silver oxides found on the surfaces of Ag nanostructures are important for photoblinking to take place since nanostructures with a protective layer of polymeric citrate or cetyltrimethylammonium bromide (CTAB) against atmospheric O(2) do not display obvious emission intermittency.

PMID:
21817591
DOI:
10.1088/0957-4484/19/03/035706
[PubMed]
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