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  • 09월 08일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Ultrabright Luminescence from Au22 Nanocluster Protected with Rigidified Au(I)-Thiolate Shell

2015년 9월 11일 13시 21분 19초
ANAL2.O-28 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 16시 : 13분
분석화학 - Oral Presentation of Young Analytical Chemists II
저자 및
표경림, 윤숙영, 이동일*
연세대학교 화학과, Korea
Thiolate protected gold nanoclusters(AuNCs) have been one of the most studied materials for the past few years owing not only to their high thermodynamic and chemical stability, but also to their interesting size-specific physicochemical properties. However, the application in using their luminescent properties is still scarce because of their low quantum yield(Q.Y.; < 0.2%). In this presentation, we present the synthesis and characterization of stable, water soluble and highly luminescent AuNCs which are protected by glutathione(GS) ligands. Also a novel strategy to dramatically enhance the luminescence efficiency of gold clusters will be discussed. The key to synthesizing highly luminescent AuNCs, was to reduce the gold(III) salt slowly with sodium borohydride in the presence of ligands. To slow down the reducing reaction, the synthesis was carried out in a very dilute alkaline condition. Thus prepared cluster mixture was purified by poly-acrylamide gel electrophoresis, which isolated a distinctive red-emitting luminescent cluster with a Q.Y. of 7%. By characterizing with electrospray ionization mass spectrometry the isolated AuNCs was found to be Au22GS18. Further modification on Au22GS18 was made by ion-pairing bulky tetraoctylammonium cation to the carboxyl group at the end of the glutathione ligands, which showed a massive increase in the luminescence (Q.Y.~60%). With its ultrafine size (< 2nm), high quantum yield, low toxicity, it is expected to be a promising material in diverse fields. Furthermore, the enhancing strategy of the Au(I)-thiolate shell emission can be effectively used for detecting proteins and other biologically relevant materials that change the environment around the Au(I)-thiolate shell.