研究目的
To develop an amorphous shell component-crystallization strategy for the synthesis of high quality sub-10 nm NaYF4:Yb/Er@NaGdF4 core-shell nanocrystals and to understand the nucleation and growth process using dynamic light scattering.
研究成果
The amorphous shell-crystallization strategy successfully fabricates high quality sub-10 nm NaYF4:Yb/Er@NaGdF4 core-shell nanoparticles with uniform morphology and size. The study provides insights into the nucleation and growth process, emphasizing the importance of seed size and injection temperature. This approach offers a pathway for the synthesis of other sub-10 nm core-shell nanocrystals for various applications.
研究不足
The study highlights the challenge of controlling the secondary nucleation process when synthesizing core-shell nanocrystals, especially with ultra-small seeds. The size of seed nanocrystals and the injection temperature of the shell component precursor are critical factors that need precise control.
1：Experimental Design and Method Selection:
The study employs an amorphous shell-crystallization strategy for the synthesis of core-shell nanocrystals. Dynamic light scattering (DLS) technique is used to investigate the secondary nucleation and growth process.
2：Sample Selection and Data Sources:
NaYF4:Yb/Er nanocrystals of different sizes (40, 20, and 7 nm) are used as seeds. The shell component precursor is injected at high temperature (280 oC) for the epitaxial growth process.
3：List of Experimental Equipment and Materials:
Transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray spectroscopy (EDX), X-ray power diffraction (XRD), fluorescence spectrometer, and Dynamic light scattering (ZetasizerNano-ZS900) are used for characterization.
4：Experimental Procedures and Operational Workflow:
The synthesis involves heating a mixture of oleic acid, 1-octadecene, and a methanol solution of NaOH and NH4F, followed by injection of Y78%Yb20%Er2%-OA precursor solution and Gd-OA precursor solution at specific temperatures and times.
5：Data Analysis Methods:
The size distribution and morphologies of the nanocrystals are analyzed using DLS and TEM. The phase and chemical composition are characterized by XRD and EDX, respectively.
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Transmission electron microscopy
JEM-2100F
JEOL
Investigation of the morphologies of the samples
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High-resolution transmission electron microscopy
JEM-2100F
JEOL
Detailed imaging of nanocrystal structures
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Fluorescence spectrometer
FLS980
Edinburgh Instruments Ltd.
Recording upconversion fluorescence spectra
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Dynamic light scattering
ZetasizerNano-ZS900
Malvern
Characterization of size distribution of the as-prepared products
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Energy dispersive X-ray spectroscopy
Elemental composition analysis
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X-ray power diffraction
Philips X’Pert PRO SUPER
Philips
Phase characterization of the as-prepared product
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