Ultra-high sensitivity of rhodamine B sensing based on NaGdF_4:Yb^(3+),Er^(3+)@NaGdF_4 core-shell upconversion nanoparticles

作     者：Hanping Xiong Qiuhong Min Hongqing Ma Lei Zhao Wenbo Chen Jianbei Qiu Xue Yu Xuhui Xu 

作者机构：Faculty of Materials Science and EngineeringKunming University of Science and Technology Shandong Provincial Key Laboratory of Soil Conserwation and Environmental ProtectionCollege of Resources and EnvironmentLinyi University School of Physics and Opto-Electronic Technology Baoji University of Arts and Sciences Engineering Research Center of New Energy Storage Devices and ApplicationsChongqing University of Arts and Sciences 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2019年第37卷第4期

页      面：339-344页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 070302[理学-分析化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(61565009,11664022) the Foundation of Natural Science of Yunnan Province(2016FB088) the Reserve Talents Project of Yunnan Province(2017HB011) the Young Talents Support Program of Faculty of Materials Science and Engineering,Kunming University of Science and Technology(14078342) Scientific and Technological Research Program of Chongqing Municipal Education Commission(KJ1711277) 

主　　题：Upconversion nanoparticles Fluorescent probe Rhodamine B Radiation energy transfer Rare earths 

摘      要：A series of mono-dispersed hexagon NaGdF_4:Yb^(3+),Er^(3+)@NaGdF_4 core-shell nanoparticles with different shell thickness were synthesized via a co-precipitation method. Nanoparticles with high upconversion fluorescent emissions result in large signal-to-noise ratio, which guarantees the accuracy of the sensitivity. Besides, the maximum sensitivity of these NPs as detection film increases first and then decreases with the shell thickness increasing. When the shell thickness is 2.3 nm(NaGdF_4-2), the maximum sensitivity(0.69959 ppm^(-1)) is reached. A large degree of overlap between the rhodamine B absorption band and the Er^(3+) green emission bands ensures that the NaGdF_4:Yb^(3+),Er^(3+)@NaGdF_4 nanoparticles can be used as fluorescent probe to detect the concentration of rhodamine B based on fluorescent intensity ratio technology. The linear relationship between the rhodamine B concentration and the intensity ratio(R) of green and red emission intensity(I_(S+H) and I_F) were studied systematically. The result shows that the maximum sensitivity can be obtained in low concentration rhodamine B(4 ppm), which is lower than the reported minimum detection concentration. Thus, the ultra-high sensitivity detection by NaGdF_4:Yb^(3+),Er^(3+)@NaGdF_4 core-shell upconversion nanoparticles in low concentration can be realized,which provides promising applications in bio-detection filed.