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Park, Jongnam
Materials and Chemistry Lab (MCL)
Research Interests
  • Inorganic synthesis, microfluidics, nanomaterials, surface engineering, bioimaging

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Supercritical Continuous-Microflow Synthesis of Narrow Size Distribution Quantum Dots

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Title
Supercritical Continuous-Microflow Synthesis of Narrow Size Distribution Quantum Dots
Author
Marre, SamuelPark, JongnamRempel, JaneGuan, JuanBawendi, Moungi G.Jensen, Klavs F.
Issue Date
2008-12
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.20, no.24, pp.4830 - +
Abstract
The continuous microflow synthesis of CdSe quantum dots (QD) at high pressure both in a conventional high-boiling-point solvent, squalane, and also in liquid hexane, was demonstrated. All experiments were performed in Silicon/Pyrex microreactors that allow for easy optical access and sustain high pressures. Synthesis of CdSe QDs was carried out at 5 MPa. The residence time was tuned from 30 to 150s by varying the flow rate. Typical photoluminescence spectra as a function of residence time for CdSe QDs synthesized in liquid squalane and sc-hexane at 270°C and 5 MPa with a precursor concentration of 3.8×10-3 M, was obtained from TEM measurements. The average QD diameter was determined using the wavelength at the emission maximum. Comparison between solvents shows that at a given residence time, QDs synthesized in sc-hexane are approximately 20-30% smaller than those synthesized in liquid squalane.
URI
https://scholarworks.unist.ac.kr/handle/201301/6985
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=58049179868
DOI
10.1002/adma.200801579
ISSN
0935-9648
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