空心双壳TiO2：x％Eu3 + @ SiO2：y％Tb3 +纳米球中的界面能转移用于组织成像,ACS Applied Nano Materials

当前位置： X-MOL 学术 › ACS Appl. Nano Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

空心双壳TiO2：x％Eu3 + @ SiO2：y％Tb3 +纳米球中的界面能转移用于组织成像
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2019-11-12 00:00:00 , DOI: 10.1021/acsanm.9b01713
Fangke Wang ₁ , Lei Cui ₁ , Zhengce An ₁ , Xiangting Zhang ₁ , Ye Sheng ₁ , Yanhua Song ₁ , Haifeng Zou ₁

Affiliation

在本文中，中空双壳TiO ₂：x％Eu ³⁺ @SiO ₂：y％Tb ³⁺纳米球（C1-Ti- x / Si- y）是使用碳球作为硬模板，随后是两个溶胶-凝胶涂覆步骤。结果表明，内部TiO ₂层和外部SiO ₂层之间存在很强的相互作用，其特征可以是Ti-O-Si键的表面含量高。强大的相互作用使从Tb ³⁺到Eu ^3+的有效能量转移成为可能离子穿过双壳界面。从Tb的界面能量转移（IET）效率³⁺与Eu ³⁺离子的强烈Eu的掺杂浓度的影响³⁺其最大值被确定为30.2％的离子。此外，通过这种强相互作用，内TiO ₂层的表面被外SiO ₂层改性，这显着增强了发射强度并抑制了Eu ³⁺离子的浓度猝灭。在377 nm激发下，C1-Ti- x / Si- y同时显示源自Eu ³⁺和Tb ^3+的红色和绿色发射离子。而且，通过改变Tb ³⁺和Eu ³⁺离子的掺杂浓度，可以将样品的发光颜色从绿色调整为橙色和红色。表征结果表明，我们提出的荧光粉可能在组织成像中提供潜在的应用。

"点击查看英文标题和摘要"

Interfacial Energy Transfer in Hollow Double-Shelled TiO2:x%Eu3+@SiO2:y%Tb3+ Nanospheres for Tissue Imaging

In this paper, hollow double-shelled TiO₂:x%Eu³⁺@SiO₂:y%Tb³⁺ nanospheres (C1–Ti-x/Si-y) were fabricated using carbon spheres as hard template followed by a two-step sol–gel coating process. The results demonstrate that there is strong interaction between the inner TiO₂ layer and outer SiO₂ layer, which can be characterized by the high surface content of Ti–O–Si bonds. The strong interaction makes it possible to achieve efficient energy transfer from Tb³⁺ to Eu³⁺ ions through crossing the double-shelled interface. The interfacial energy transfer (IET) efficiency from Tb³⁺ to Eu³⁺ ions is strongly influenced by the doping concentration of Eu³⁺ ions whose maximum is determined to be 30.2%. Furthermore, the surface of inner TiO₂ layer is modified by the outer SiO₂ layer through this strong interaction, which significantly enhances the emission intensity and suppresses the concentration quenching of Eu³⁺ ions. Under 377 nm excitation, C1–Ti-x/Si-y simultaneously exhibits red and green emissions derived from Eu³⁺ and Tb³⁺ ions, respectively. Moreover, by varying the doping concentration of Tb³⁺ and Eu³⁺ ions, the luminescence color of the samples can be tuned from green to orange and red. The characterization results show that our proposed phosphors may provide potential applications in tissue imaging.

更新日期：2019-11-13

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南