دورية أكاديمية
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Controlled Isotropic and Anisotropic Shell Growth in β-NaLnF 4 Nanocrystals Induced by Precursor Injection Rate.

التفاصيل البيبلوغرافية
العنوان: Controlled Isotropic and Anisotropic Shell Growth in β-NaLnF 4 Nanocrystals Induced by Precursor Injection Rate.
المؤلفون: Fischer S; Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States., Swabeck JK; Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States., Alivisatos AP; Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.; Kavli Energy NanoScience Institute , Berkeley, California 94720, United States.
المصدر: Journal of the American Chemical Society [J Am Chem Soc] 2017 Sep 06; Vol. 139 (35), pp. 12325-12332. Date of Electronic Publication: 2017 Aug 25.
نوع المنشور: Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, Non-U.S. Gov't
اللغة: English
بيانات الدورية: Publisher: American Chemical Society Country of Publication: United States NLM ID: 7503056 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1520-5126 (Electronic) Linking ISSN: 00027863 NLM ISO Abbreviation: J Am Chem Soc Subsets: PubMed not MEDLINE
أسماء مطبوعة: Publication: Washington, DC : American Chemical Society
Original Publication: Easton, Pa. [etc.]
مستخلص: Precise morphology and composition control is vital for designing multifunctional lanthanide-doped core/shell nanocrystals. Herein, we report controlled isotropic and anisotropic shell growth techniques in hexagonal sodium rare-earth tetrafluoride (β-NaLnF 4 ) nanocrystals by exploiting the kinetics of the shell growth. A drastic change of the shell morphology was observed by changing the injection rate of the shell precursors while keeping all other reaction conditions constant. We obtained isotropic shell growth for fast sequential injection and a preferred growth of the shell layers along the crystal's c-axis [001] for slow dropwise injection. Using this slow shell growth technique, we have grown rod-like shells around different almost spherical core nanocrystals. Bright and efficient upconversion was measured for both isotropic and rod-like shells around β-NaYF 4 nanocrystals doped with Yb 3+ /Er 3+ and Yb 3+ /Tm 3+ . Photoluminescence upconversion quantum yield and lifetime measurements reveal the high quality of the core/shell nanocrystal. Furthermore, multishell rod-like nanostructures have been prepared with optically active cores and tips separated by an inert intermediate shell layer. The controlled anisotropic shell growth allows the design of new core/multishell nanostructures and enables independent investigations of the chemistry and physics of different nanocrystal facets.
تواريخ الأحداث: Date Created: 20170805 Date Completed: 20180516 Latest Revision: 20180516
رمز التحديث: 20231215
DOI: 10.1021/jacs.7b07496
PMID: 28777550
قاعدة البيانات: MEDLINE
الوصف
تدمد:1520-5126
DOI:10.1021/jacs.7b07496