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조승호

Cho, Seungho
Metal Oxide DEsign Lab.
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Highly Fluorescent and Stable Quantum Dot-Polymer-Layered Double Hydroxide Composites

Author(s)
Cho, SeunghoKwag, JungheonJeong, SanghwaBaek, YeonggyeongKim, Sungjee
Issued Date
2013-04
DOI
10.1021/cm3040505
URI
https://scholarworks.unist.ac.kr/handle/201301/22189
Fulltext
http://pubs.acs.org/doi/abs/10.1021/cm3040505
Citation
CHEMISTRY OF MATERIALS, v.25, no.7, pp.1071 - 1077
Abstract
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.
Publisher
AMER CHEMICAL SOC
ISSN
0897-4756
Keyword (Author)
quantum dotphotoluminescence quantum yieldamphiphilic polymer encapsulationlayered double hydroxidephotostability
Keyword
LIGHT-EMITTING-DIODESGOLD NANOPARTICLESWATERNANOCOMPOSITESNANOCRYSTALSDELAMINATIONNANOSHEETSEMISSIONPHOTOLUMINESCENCEEXCHANGE

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