期刊
CHEMISTRY OF MATERIALS
卷 25, 期 7, 页码 1071-1077出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm3040505
关键词
quantum dot; photoluminescence quantum yield; amphiphilic polymer encapsulation; layered double hydroxide; photostability
资金
- KOSEF
- MOST [20120006280, 20120005973]
- Priority Research Center Program through NRF [2009-0094036]
- Industrial Strategic technology development program [10035274]
- Ministry of Knowledge Economy (MKE, Korea)
- National Research Foundation of Korea [2008-0060069, 2009-0094036] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We report a designed strategy for a synthesis of highly luminescent and photostable composites by incorporating quantum dots (QDs) into layered double hydroxide (LDH) matrices without deterioration of a photoluminescence (PL) efficiency of the fluorophores during the entire processes of composite formations. The QDs synthesized in an organic solvent are encapsulated by polymers, poly(maleic acid-alt-octadecene) to transfer them into water without altering the initial surface ligands. The polymer-encapsulated QDs with negative zeta potentials (-29.5 +/- 2.2 mV) were electrostatically assembled with positively charged (24.9 +/- 0.6 mV) LDH nanosheets to form QD-polymer-LDH composites (PL quantum yield: 74.1%). QD-polymer-LDH composite films are fabricated by a drop-casting of the solution on substrates. The PL properties of the films preserve those of the organic QD solutions. We also demonstrate that the formation of the QD-polymer-LDH composites affords enhanced photostabilities through multiple protections of QD surface by polymers and LDH nanosheets from the environment.
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