| Surface chemistry of colloidal PbSe nanocrystals. | |
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MedLine Citation:
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PMID: 18928251 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Solution nuclear magnetic resonance spectroscopy (NMR) is used to identify and quantify the organic capping of colloidal PbSe nanocrystals (Q-PbSe). We find that the capping consists primarily of tightly bound oleic acid ligands. Only a minor part of the ligand shell (0-5% with respect to the number of oleic acid ligands) is composed of tri- n-octylphosphine. As a result, tuning of the Q-PbSe size during synthesis is achieved by varying the oleic acid concentration. By combining the NMR results with inductively coupled plasma mass spectrometry, a complete Q-PbSe structural model of semiconductor core and organic ligands is constructed. The nanocrystals are nonstoichiometric, with a surface that is composed of lead atoms. The absence of surface selenium atoms is in accordance with an oleic acid ligand shell. NMR results on a Q-PbSe suspension, stored under ambient conditions, suggest that oxidation leads to the loss of oleic acid ligands and surface Pb atoms, forming dissolved lead oleate. |
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Authors:
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Iwan Moreels; Bernd Fritzinger; José C Martins; Zeger Hens |
Publication Detail:
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Type: Journal Article Date: 2008-10-17 |
Journal Detail:
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Title: Journal of the American Chemical Society Volume: 130 ISSN: 1520-5126 ISO Abbreviation: J. Am. Chem. Soc. Publication Date: 2008 Nov |
Date Detail:
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Created Date: 2008-11-06 Completed Date: 2008-12-15 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503056 Medline TA: J Am Chem Soc Country: United States |
Other Details:
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Languages: eng Pagination: 15081-6 Citation Subset: - |
Affiliation:
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Physics and Chemistry of Nanostructures, Ghent University, Krijgslaan 281-S12, BE-9000 Ghent, Belgium. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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