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| Type |
Poster Presentation |
| Area |
Material Chemistry |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
MAT.P-438 |
| Subject |
Luminescence enhancement strategies for luminescent gold nanoclusters : Surface Modification |
| Authors |
SangMyeong Han, Kyunglim Pyo1, Dongil Lee1,*
department of chemistry, Yonsei University, Korea
1Department of Chemistry, Yonsei University, Korea
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| Abstract |
Recently, luminescent nanoclusters have received great attention for their applications in sensors and biological imaging. Despite of their ultrafine size, photostability and low toxicity, which are appropriate properties for technical applications, they are still not sufficiently bright for optical applications. Herein, we suggest luminescence enhancement strategies for the luminescent nanocluster Au22(SG)18 where SG is glutathione, by functionalization of the cluster shell. Firstly, the gold cluster was ion paired with bulky tetraoctylammonium(TOA) cations which rigidified the Au(I)-shell structure by the intermolecular interactions between alkyl chains of TOA. As a result, the luminescence increased by 9-folds(QY ~60%). However, this cluster is not soluble in aqueous solution which limited the application in biochemistry. Another enhancement strategy is by using energy transfer between gold cluster and coupled small aromatic molecule. In prior research, pyrene was conjugated to the gold cluster. When conjugated pyrene excited at 350nm, the emission of the cluster increased 8-folds while the pyrene emission decreased showing energy transfer properties. Based on this result, fluorescein(FL) was coupled to the gold cluster to enhance the emission by using the energy transfer properties and use FL as a pH sensor. 5-carboxyfluorsecein was bound at amine from cluster by DCC reaction. We observed optical properties of fluorescein coupled cluster to identify energy transfer properties between gold and FL. Also pH dependent character originated from fluorescein was checked on as-synthesized cluster. |
| E-mail |
tkdaud95@naver.com |
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121st General Meeting of the KCS