Polymer-assisted sol–gel process for the preparation of photostimulable core/shell structured SiO2/Zn2SiO4:Mn2+ particles

Polymer-assisted sol–gel process for the preparation of photostimulable core/shell structured SiO2/Zn2SiO4:Mn2+ particles
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聚合物辅助溶胶法制备光激励核/壳结构SiO2/Zn2SiO4:Mn2颗粒

DOI:
10.1016/j.matchemphys.2014.09.017
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发表时间:
2014
影响因子:
4.6
通讯作者:
Gerhard Sextl
Gerhard Sextl
中科院分区:
材料科学3区
文献类型:
--
作者:
Moritz Milde;Sofia Dembski;Andre Osvet;Miroslaw Batentschuk;Albrecht Winnacker;Gerhard Sextl

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采用改进的Pechini溶胶-凝胶法制备了粒径约为200 nm的SiO2/Zn 2SiO 4:Mn 2+核/壳型纳米粒子。研究的重点是壳形成机理的调查和关键合成参数的确定。颗粒结构的精确调整对于光学性质至关重要。评价了有机添加剂、涂覆溶液的pH值和退火温度对所得颗粒的性质的影响。利用透射电子显微镜、X射线衍射、傅里叶变换红外光谱和核磁共振谱等技术对影响因素的作用进行了详细的研究。通过在pH值为1下采用聚乙二醇(PEG)实现最均匀的涂层。柠檬酸与PEG组合的应用导致形成不均匀的壳。随着退火温度的升高(1100 °C),颗粒显示出强度增加的光致发光和光激励发光。这些核/壳结构的颗粒具有作为生物医学应用的发光标记剂的潜力。
In this study the SiO2/Zn2SiO4:Mn2+core/shell particles with diameters of about 200 nm were prepared by a modified Pechini sol–gel method. The focus of the study was on the investigation of the shell formation mechanism and on the determination of key synthesis parameters. A precise adjustment of the particle structure is crucial for optical properties. The influence of the organic additives, the pH value of the coating solution and the annealing temperature on the properties of the resulting particles was evaluated. The roles of the influential factors were studied in detail using transmission electron microscopy, X-ray diffraction, Fourier transform infrared and nuclear magnetic resonance spectroscopy. The most homogeneous coating was achieved by employing polyethylene glycol (PEG) at a pH value of 1. The application of citric acid in combination with PEG caused the formation of inhomogeneous shells. The particles showed photoluminescence and photostimulable luminescence of increasing intensities with rising annealing temperatures (1100 °C). These core/shell structured particles have the potential to serve as luminescent labeling agents for biomedical applications.
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