Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 9, Pages 2376-2380Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201307480
Keywords
doping; gold; metal nanoclusters; photoluminescence; silver
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Funding
- NSFC [20871112, 21072001, 21372006]
- Chang Jiang Scholars Program
- Scientific Research Foundation for Returning Overseas Chinese Scholars, State Education Ministry
- Ministry of Human Resources and Social Security
- Anhui Province International Scientific and Technological Cooperation Project
- 211 Project of Anhui University
- Air Force Office of Scientific Research under AFOSR [FA9550-11-1-9999 (FA9550-11-1-0147)]
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The rod-shaped Au-25 nanocluster possesses a low photoluminescence quantum yield (QY=0.1%) and hence is not of practical use in bioimaging and related applications. Herein, we show that substituting silver atoms for gold in the 25-atom matrix can drastically enhance the photoluminescence. The obtained AgxAu25-x (x=1-13) nanoclusters exhibit high quantum yield (QY=40.1%), which is in striking contrast with the normally weakly luminescent AgxAu25-x species (x=1-12, QY=0.21%). X-ray crystallography further determines the substitution sites of Agatoms in the AgxAu25-x cluster through partial occupancy analysis, which provides further insight into the mechanism of photoluminescence enhancement.
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