Ligand-Controlled Polytypism of Thick-Shell CdSe/CdS Nanocrystals.
We report the synthesis of CdSe/CdS semiconductor core/shell nanocrystals with very thick (5 nm) CdS shells. As in the case of core CdSe nanocrystals, we show that a thick-shell CdSe/CdS core/shell structure can be synthesized in either a pure wurtzite (W) or a zinc-blende (ZB) crystal structure. Wh...
| Publicado en: | Journal of the American Chemical Society Vol. 132; no. 3; pp. 953 - 960 |
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| Autores principales: | , , |
| Formato: | Artículo |
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American Chemical Society
1/27/2010
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=48128019&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 48128019 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 1/27/2010 vid: 132 iid: 3 pid: 997 pub: American Chemical Society artinfo: ui: 48128019 10.1021/ja9034973 ppf: 953 ppct: 7 formats: tig: atl: Ligand-Controlled Polytypism of Thick-Shell CdSe/CdS Nanocrystals. aug: au: Mahler, Benoît Lequeux, Nicolas Dubertret, Benoît affil: Laboratoire de Physique et d'Etude des Matériaux, CNRS UPR5, ESPCI 10 rue Vauquelin, 75231 Paris, France Laboratoire Physicochimie des Polymères et Milieux Dispersés, UMR 7615, ESPCI 10 rue Vauquelin, 75231 Paris, France su: Nanocrystals Ligands (Chemistry) Zinc Spectrum analysis Organic compounds sug: subj: Nanocrystals Ligands (Chemistry) Zinc Spectrum analysis Organic compounds ab: We report the synthesis of CdSe/CdS semiconductor core/shell nanocrystals with very thick (5 nm) CdS shells. As in the case of core CdSe nanocrystals, we show that a thick-shell CdSe/CdS core/shell structure can be synthesized in either a pure wurtzite (W) or a zinc-blende (ZB) crystal structure. While the growth of thick-shell wurtzite CdSe/CdS is quite straightforward, we observe that the growth of a CdS shell on zinc-blende CdSe cores is more difficult and leads to wurtzite/zinc-blende polytypism when primary amines are present during the shell formation. Using absorption spectra analysis to differentiate zinc blende from wurtzite CdSe, we show that primary amines can induce a nearly complete structural transformation of CdSe ZB cores into W cores. This better understanding of the CdSe ligand-dependent crystal structural evolution during shell growth is further used to grow large (10 nm)-diameter perfect zinc-blende CdSe core crystals emitting above 700 nm, and perfect ZB thick-shell CdSe/CdS nanocrystals. We observed that all thick-shell CdSe/CdS QDs have extremely reduced blinking events compared to thin-shell QDs, without any significant influence of crystalline structure and polytypism. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2010 holdings: @attributes: islocal: N |
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