材料科学
激发态
分析化学(期刊)
纳米颗粒
激光器
兴奋剂
激发
荧光
发光
波长
镧系元素
纳米结构
离子
光电子学
纳米技术
光学
原子物理学
化学
工程类
有机化学
物理
电气工程
色谱法
作者
Zhaojing Ba,Min Hu,Yiming Zhao,Yiqing Wang,Jing Wang,Zhenxi Zhang
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2018-06-25
卷期号:29 (35): 355704-355704
被引量:12
标识
DOI:10.1088/1361-6528/aac9fd
摘要
Non-contact thermal sensors are important devices to study cellular processes and monitor temperature in vivo. Herein, a novel highly sensitive nanothermometer based on NaYF4:Yb,Er@ NaYF4@NaYF4:Yb,Tm@ NaYF4:Nd (denoted as Er@Y@Tm@Nd) was prepared by a facile solvothermal method. When excited by the near-infrared (NIR) light of 808 and 980 nm, the as-prepared Er@Y@Tm@Nd nanoparticles could emit both blue and green light, respectively, since the lanthanide cations responsible for these emissions are gathered inside this nanostructure. The green and blue light intensity ratio exhibits obvious temperature dependence in the range of the physiological temperature. Additionally, the fluorescence intensity of Er3+ and Tm3+ are also greatly enhanced due to the multilayer structure that implies avoiding the Er3+ and Tm3+ energy cross-relaxation by introduction of a NaYF4 wall between them. The as-prepared core-shell-shell-shell structure with Er3+ and Tm3+ in different layers improves dozens of times of the thermal sensitivity based on the non-thermal coupling levels of the probe: the maximum values for the sensitivity are 2.95% K-1 (I Er-521/I Tm-450) and 6.30% K-1 (I Tm-474/I Er-541) when excited by 980 and 808 nm laser sources, respectively. These values are well above those previously reported (<0.7% K-1), indicating that the prepared nanostructures are temperature sensors with excellent thermal sensitivity and sensitive to NIR wavelength excitation that makes them highly preferred for thermal detection.
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