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Preparation And Performance Study Of Coating Modified Zinc Aluminate-based Near-Infrared Long Afterglow Materials

Posted on:2022-04-14Degree:MasterType:Thesis
Country:ChinaCandidate:Y F LiuFull Text:PDF
GTID:2481306575482904Subject:Materials engineering
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The zinc aluminate-based near-infrared long-lasting material is a long-lasting material that emits light in the near-infrared range.This topic uses ZnAl2O4 as the matrix,through high-temperature solid-phase doping modification,to improve the luminescence performance of ZnAl2O4-based materials,and sing hydrothermal method to prepare nano-scale long afterglow materials.Finally,it is modified by PEG coating to prepare near-infrared long afterglow nanomaterials that can be used in biomarking and other fields.The hydrothermal method used Zn(NO3)26H2O,Al(NO3)39H2O,Cr(NO3)3,GeO2,CH4N2O,PEG2000 as raw materials to prepare nano-scale Zn1.3Al1.4Ge0.3O4:1%Cr3+samples.When the hydrothermal temperature is 200?,the hydrothermal time is 21 h,and the sintering temperature is 1000?,the Zn1.3Al1.4Ge0.3O4:1%Cr3+sample has better luminescence performance and afterglow performance.The TEM confirms that the particle size of the prepared sample reaches the nanometer level.The high-temperature solid phase method used ZnO,Al2O3,GeO2,and Cr2O3 as raw materials to prepare Zn1+xAl2-2xGexO4:y%Cr3+near-infrared long afterglow materials.When the Ge4+-doping concentration is 0.3,the Cr3+-doping concentration is 1%,and the sintering temperature is 1400?,the luminescence performance and afterglow performance of the Zn1.3Al1.4Ge0.3O4:1%Cr3+sample reach the best.The Zn1.3Al1.4Ge0.3O4:1%Cr3+sample was modified by PEG coating,and the sample prepared by the high-temperature solid phase method was treated by high-energy ball milling as the raw material for the coating modification.The particle size reached nanometer level,ranging from 20 to 200 nm,and the luminescence and afterglow performance were good.It was confirmed by infrared spectroscopy that the PEG was modified on the surface of the particles,and the obvious core-shell structure was observed by TEM,which proved that PEG was successfully encapsulated and modified on the particle surface of the Zn1.3Al1.4Ge0.3O4:1%Cr3+sample.Figure 51;Table 2;Reference 74...
Keywords/Search Tags:Near-infrared long afterglow material, Zn1.3Al1.4Ge0.3O4%Cr3+, luminescence performance, afterglow performance, coating modification
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