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| Type |
Oral Presentation |
| Area |
Oral Presentation for Young Scholars in Physical Chemistry |
| Room No. |
Room 208+209+210 |
| Time |
THU 09:40-: |
| Code |
PHYS.O-5 |
| Subject |
Preparing Highly Luminescent Gold Nanoclusters via Surface Modification
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| Authors |
Kyunglim Pyo, Dongil Lee*
Department of Chemistry, Yonsei University, Korea
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| Abstract |
Quantum-sized gold nanoclusters(AuNCs) with photoluminescence properties have been actively studied as a promising material for optical and biological applications. However the uncertainty about the origin of the luminescence properties and the low quantum yield(QY<10%) are the largest obstacle for the development of highly luminescent clusters. In this presentation, we present novel strategies for enhancing the luminescence based on glutathione(SG) protected Au22SG18 (Au22, QY~7%) via relevant surface modification. Firstly, Au22 was ion-paired with bulky tetraoctylammonium (TOA) cation that binds with carboxylate anions of glutathione, which rigidified the Au(I)-shell structure by significant intermolecule interactions between the alkyl chains of TOA cations. TOA-Au22 was confirmed to maintain its composition, while the quantum yield showed a mass increment of 9-fold enhanced luminescence(QY~60%). This is one of the highest reported so far for gold nanoclusters. However the clusters are not soluble in water which limits their use in biological applications. Therefore secondly, we prepared a Au22 whose surface was engineered with benzyl chloroformate and pyrene(Py) to achieve higher quantum efficiency in water. This strategy not only enhanced the luminescence by more than 5-fold(QY~30%) in water, owing to the rigidifying effect of the aromatic molecules, but also induced resonance energy transfer from Py to Au22 when photoexcited at 350nm. As a result the pyrene functionalized Au22 cluster showed 8-fold increased luminescence compared to Au22. These strategies open up a new way for preparing highly luminescent non-toxic AuNCs for optical and biological applications. |
| E-mail |
mylifetohoi@naver.com |
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120th General Meeting of the KCS