研究目的
To fabricate uniform and dense Lu2O3:Eu3+ nanowire arrays using the sol-gel method assisted with porous AAO templates and to study their morphology, crystal structure, composition, and luminescent properties for potential application in high-resolution indirect digital X-ray imaging detectors.
研究成果
Lu2O3:Eu3+ nanowire arrays were successfully synthesized using sol-gel and AAO templates, exhibiting uniform, ordered, and dense structures with good luminescence properties. The nanowires have potential as scintillation screens to improve spatial resolution in X-ray imaging, offering a cost-effective alternative to existing methods.
研究不足
The crystallite size of nanowires is confined by the AAO template, leading to smaller grains compared to nanopowder. The process requires careful control of hydrolysis, condensation, and deposition to avoid template degradation. The thickness of coatings may be limited compared to X-ray absorption lengths in some applications.
1：Experimental Design and Method Selection:
The sol-gel process combined with AAO templates was used for stoichiometric synthesis of ordered nanowire arrays due to advantages like low synthesis temperature and homogeneous multi-component.
2：Sample Selection and Data Sources:
Commercial porous AAO templates with pore size ~300 nm and length 60 μm were used. Lutetium nitrate and europium nitrate in a molar ratio of
3：93/07 were dissolved in distilled water. List of Experimental Equipment and Materials:
AAO templates (Shanghai Shangmu Tech. Co. Ltd.), lutetium nitrate and europium nitrate (Shanghai Diyang Industrial Co. Ltd.), muffle furnace, SEM (Philips XL30), TEM (JEOL JEM 2011), XRD (Haoyuan DX2700), fluorescence spectrophotometer (Hitachi F7000), X-ray tube (Shanghai Nucl. Med. Instrum. Co. F30-III), monochromator (Zolix SBP300), photomultiplier (Hamamatsu R928-28).
4：8). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Dissolve nitrates in water, stir at 60°C to form transparent solution, immerse AAO template, sonicate to remove air, control soaking time, sinter at 500°C for 1h, clean surface, reanneal at 800°C for 2h. Characterize using SEM, TEM, XRD, PL, XEOL.
5：2h. Characterize using SEM, TEM, XRD, PL, XEOL. Data Analysis Methods:
5. Data Analysis Methods: XRD patterns analyzed for crystal structure, Scherrer's equation for grain size calculation, EDX for composition, PL and XEOL spectra for luminescence properties.
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TEM
JEM 2011
JEOL
Used for transmission electron microscopy imaging and selected area electron diffraction to analyze nanowire structure.
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Fluorescence spectrophotometer
F7000
Hitachi
Used for photoluminescence measurements to study excitation and emission spectra.
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Monochromator
SBP300
Zolix
Used in luminescence spectroscopy to measure spectra.
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Photomultiplier
R928-28
Hamamatsu
Used for detecting luminescence signals in spectroscopy measurements.
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AAO template
pore size ~300 nm, length 60 μm
Shanghai Shangmu Tech. Co. Ltd.
Used as a template for synthesizing nanowire arrays, providing ordered pores to control size and shape.
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SEM
XL30
Philips
Used for characterizing the morphology of samples, including top and side views of nanowires and templates.
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XRD
DX2700
Haoyuan
Used for X-ray diffraction analysis to determine crystal structure and phase purity of samples.
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X-ray tube
F30-III
Shanghai Nucl. Med. Instrum. Co.
Used as an X-ray excitation source for X-ray excited optical luminescence measurements.
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Muffle furnace
Used for sintering the samples at high temperatures (500°C and 800°C).
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