Journal
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
Volume 34, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppsc.201700029
Keywords
chemical sensing; confinement-assisted emission enhancements; copper nanoclusters; metal-organic frameworks; photoluminescence
Funding
- Research Grant Council of Hong Kong SAR [T23-713/11]
- Ministry of Education, Youth, and Sports of the Czech Republic [LO1305, LM2015073]
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Herein, a strategy for improving both the stability and the emission intensity of Cu nanoclusters based on their entrapment into metal-organic frameworks (MOFs) is demonstrated. The latter effect reaches 20 times and is ascribed to a confinement-assisted emission enhancement similar to the aggregation induced emission of fluorescent species in solution, evidenced by the prolonged emission lifetime. Cu nanoclusters are distributed homogeneously over the entire MOFs structure, as confirmed by combination of structural and elemental mapping studies. Toward potential applications of Cu nanocluster/MOF composites as chemical sensors, the authors demonstrate the selective quenching of their emission by 2,4,6-trinitrotoluene attributed to specific electron-withdrawing interactions with glutathione ligands on Cu clusters.
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