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Single-Step Synthesis of Quantum Dots with Chemical Composition Gradients
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Bae, Wan Ki | - |
dc.contributor.author | Char, Kookheon | - |
dc.contributor.author | Hur, Hyuck | - |
dc.contributor.author | Lee, Seonghoon | - |
dc.date.accessioned | 2009-07-19T23:25:48Z | - |
dc.date.available | 2009-07-19T23:25:48Z | - |
dc.date.issued | 2008-01-01 | - |
dc.identifier.citation | Chem. Mater. 2008, 20, 531-539 | en |
dc.identifier.issn | 0897-4756 (print) | - |
dc.identifier.issn | 1520-5002 (online) | - |
dc.identifier.uri | https://hdl.handle.net/10371/5725 | - |
dc.description.abstract | We demonstrate a single-step synthetic method for highly luminescent (i.e., quantum yield up to 80%) and stable quantum dots (QDs) by using the reactivity difference between Cd and Zn precursors and that between Se and S precursors. A wide range of emission wavelengths (500−610 nm) with a narrow fwhm (<35 nm) is obtained by changing the ratios of the precursors. Under the reaction conditions selected, Cd- and Se (with a bit of S)-based cores are formed first and Zn- and S-based shells are formed successively; therefore, the QDs have a core/shell structure with composition gradients, which relieve the lattice mismatch between core and shells. The QDs are characterized using the combined techniques of HR-TEM, UV–vis, PL spectroscopy, and ICP-AES. The QDs also have energy gradients depending on their compositions in a radial direction, which energetically confine carriers (electrons and holes) to the cores. This leads to the stability of QDs during their surface passivation from oleic acid to mercaptopropionic acid and ensures their processibility for further purposes such as optoelectronic and biological applications. | en |
dc.description.sponsorship | This research was supported in part by MOE through BK21 program and Seoul R&BD program. We thank KOSEF and the Center for Nanotubes & Nanostructured Composites for supporting this research. We also acknowledge the financial support from KOSEF through Nano Systems Institute, National Core Research Center. | en |
dc.language.iso | en | en |
dc.publisher | American Chemical Society | en |
dc.title | Single-Step Synthesis of Quantum Dots with Chemical Composition Gradients | en |
dc.type | Article | en |
dc.contributor.AlternativeAuthor | 배완기 | - |
dc.contributor.AlternativeAuthor | 차국헌 | - |
dc.contributor.AlternativeAuthor | 허혁 | - |
dc.contributor.AlternativeAuthor | 이승훈 | - |
dc.identifier.doi | 10.1021/cm070754d | - |
dc.citation.journaltitle | Chemistry of Materials | - |
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