Luminescent silicate core-shell nanoparticles: Synthesis, functionalization, optical, and structural properties
Luminescent silicate core-shell nanoparticles: Synthesis, functionalization, optical, and structural properties
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DOI：
10.1016/j.jcis.2011.01.060
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发表时间：
2011-06-01
影响因子：
9.9
通讯作者：
Winnacker, Albrecht
中科院分区：
文献类型：
--
作者：
Dembski, Sofia;Rupp, Sabine;Winnacker, Albrecht
采用改进的Pechini溶胶-凝胶法制备了SiO2/Zn 2SiO 4：Mn 2+核壳纳米粒子，其平均粒径在55-220 nm之间，然后在800-1100 ℃下进行冻干和退火。通过透射电子显微镜、X射线衍射分析和光致发光光谱对合成的纳米粒子进行了表征。结果表明，退火温度和掺杂离子浓度的变化可以调节壳层的晶体结构和光学性质。在UV激发下，样品发射绿色发光，其最大值在525 nm处，典型的为α-Zn 2SiO 4中的Mn 2+离子。所得的纳米粒子成功地修改与胺和羧基功能相对于后来的附着的生物部分。(c)2011 Elsevier Inc. All rights reserved.
SiO2/Zn2SiO4:Mn2+ core-shell nanoparticles with mean diameters in the range of 55-220 nrn were prepared by a modified Pechini sol-gel method followed by lyophilization and annealing at temperatures of 800-1100 degrees C. The as-synthesized nanoparticles were characterized by transmission electron microscopy, X-ray diffraction analysis, and photoluminescence spectroscopy. The results demonstrate that the crystal structure of the shell and the optical properties can be tuned by the annealing temperature and a variation of the concentration of doping ions. Under UV excitation, the samples emit green luminescence with its maximum at 525 nm, typical for the Mn2+ ions in alpha-Zn2SiO4. The resulting nanoparticles were successfully modified with amine and carboxyl functions with respect to a later attachment of biological moieties. (c) 2011 Elsevier Inc. All rights reserved.