Ultra-high sensitivity of rhodamine B sensing based on NaGdF4:Yb3+,Er3+@NaGdF4 core-shell upconversion nanoparticles
来源期刊：JOURNAL OF RARE EARTHS2019年第4期
论文作者：Hanping Xiong Qiuhong Min Hongqing Ma Lei Zhao Wenbo Chen Jianbei Qiu Xue Yu Xuhui Xu
文章页码：339 - 344
摘 要：A series of mono-dispersed hexagon NaGdF4:Yb3+,Er3+@NaGdF4 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（NaGdF4-2）, the maximum sensitivity(0.69959 ppm-1) is reached. A large degree of overlap between the rhodamine B absorption band and the Er3+ green emission bands ensures that the NaGdF4:Yb3+,Er3+@NaGdF4 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(IS+H and IF) 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 NaGdF4:Yb3+,Er3+@NaGdF4 core-shell upconversion nanoparticles in low concentration can be realized,which provides promising applications in bio-detection filed.
Hanping Xiong1，Qiuhong Min1，Hongqing Ma2，Lei Zhao3，Wenbo Chen4，Jianbei Qiu1，Xue Yu1，Xuhui Xu1
1. Faculty of Materials Science and Engineering,Kunming University of Science and Technology2. Shandong Provincial Key Laboratory of Soil Conserwation and Environmental Protection,College of Resources and Environment,Linyi University3. School of Physics and Opto-Electronic Technology, Baoji University of Arts and Sciences4. Engineering Research Center of New Energy Storage Devices and Applications,Chongqing University of Arts and Sciences
摘 要：A series of mono-dispersed hexagon NaGdF4:Yb3+,Er3+@NaGdF4 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（NaGdF4-2）, the maximum sensitivity(0.69959 ppm-1) is reached. A large degree of overlap between the rhodamine B absorption band and the Er3+ green emission bands ensures that the NaGdF4:Yb3+,Er3+@NaGdF4 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(IS+H and IF) 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 NaGdF4:Yb3+,Er3+@NaGdF4 core-shell upconversion nanoparticles in low concentration can be realized,which provides promising applications in bio-detection filed.
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