Preparation and characteristics of core-shell structure Yb>3b>Alb>5b>Ob>12b>:Yb³⁺@SiOb>2b> nanoparticles

详细信息	查看全文 | 推荐本文 |

• 作者：Yan-Hui Sun^a ; ^b ; Zhong-Min Yang^a ; ^{yangzm@scut.edu.cn} ; Cheng-Ning Xie^a ; Zhong-Hong Jiang^a
• 关键词：Coating materials ; Rare earth alloys and compounds ; Precipitaion ; Sol&ndash ; gel process ; Optical properties
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 July, 2012
• 卷：528
• 期：Complete
• 页码：1-9
• 文件大小：2158 K

摘要

The club-shape (Yb>0.98b>Ybb>0.02b>)b>3b>Alb>5b>Ob>12b> nanoparticles (YAG:Yb³⁺), which were synthesized by the co-precipitation method, had been successfully coated with silica from hydrolysis and condensation of tetraethyl orthosilicate (TEOS). The thickness of SiOb>2b> shell can be tuned by the amount of TEOS. The influence of different modifying surfactants, polyvinylpyrrolidone (PVP), polyethylene glycol (PEG) and cetyltrimethyl ammonium bromide (CTAB), on the final product had been investigated. The morphology and structure of the nanoparticles were characterized by scanning electron microscopy (SEM) and transmission electronic microscopy (TEM). Surface composition of the samples was studied by X-ray photoelectron spectroscopy (XPS). The results show that PVP is much more beneficial to the dispersion and formation of the core-shell structure than the others. The near-infrared photoluminescence emissions of the nanoparticles were also investigated under the excitation of 940 nm laser diode. The results indicate that SiOb>2b> shell can increase the luminescence intensity and lifetime of YAG:Yb³⁺ in the near infrared region emissions because the shell can reduce OH group content adsorbed on the surface of the samples.