Quantitative Identification of Basic Growth Channels for Formation of Monodisperse Nanocrystals.
Different mechanisms are proposed to account formation of monodisperse nanocrystals in literature, each of which is usually proposed to explain one set of experimental observations. Here, a general model based on mass conservation is developed to fully describe all possible channels including free g...
| Publicado en: | Journal of the American Chemical Society Vol. 140; no. 16; pp. 5474 - 5485 |
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| Autores principales: | , , , , |
| Formato: | Artículo |
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American Chemical Society
4/25/2018
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| Materias: | |
| 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=129345635&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 129345635 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: 4/25/2018 vid: 140 iid: 16 pid: 997 pub: American Chemical Society artinfo: ui: 129345635 10.1021/jacs.8b01296 ppf: 5474 ppct: 11 formats: tig: atl: Quantitative Identification of Basic Growth Channels for Formation of Monodisperse Nanocrystals. aug: au: Jiongzhao Li Huifeng Wang Long Lin Qun Fang Xiaogang Peng affil: Center for Chemistry of Novel & High-Performance Materials, and Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China su: Nanocrystals Monomers Microreactors Cadmium sulfide Crystallization Fourier transform infrared spectroscopy sug: subj: Nanocrystals Monomers Microreactors Cadmium sulfide Crystallization Fourier transform infrared spectroscopy ab: Different mechanisms are proposed to account formation of monodisperse nanocrystals in literature, each of which is usually proposed to explain one set of experimental observations. Here, a general model based on mass conservation is developed to fully describe all possible channels including free growth by direct incorporation of the monomers converted from the precursors, growth by dissolution of a portion of the regular nanocrystals in solution, and growth by dissolution of the clusters in solution. The new model provides convenient yet quantitative methods to determine the channel ratios at a given time. Experimentally, an automated microreactor system is developed and applied for synthesis of monodisperse CdS nanocrystals, which is coupled with liquid-phase Fourier transform infrared and UV-vis measurements to, respectively, determine precursor conversion and size/concentration of nanocrystals with high reproducibility (<1%) and proper time resolution (<1 s). Different from the most-accepted model for formation of monodisperse nanocrystals, a burst of nucleation followed by growth of all nuclei by direct incorporation of the monomers converted from the precursors (or "focusing of size distribution"), all three basic channels are found to coexist during growth of monodisperse CdS nanocrystals. While the new theory and experimental methods are applied to study growth of monodisperse nanocrystals, they can be extended to offer a full kinetic picture for formation of colloidal nanocrystals. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2018 holdings: @attributes: islocal: N |
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