福建师范大学学报（自然科学版）2026，Vol.42Issue(1)：39-47,9.DOI:10.12046/j.issn.1000-5277.2025040028
稀土掺杂硅酸钠镁锂无配体荧光水凝胶用于稀土离子检测
Rare-Earth-Doped Laponite Ligand-Free Fluorescent Hydrogels for Rare-Earth Ion Detection
摘要
Abstract
A novel ligand-free hydrogel based on rare-earth-doped Laponite(LP),designated as LP-Tb-Eu(LP doped with Tb3+and Eu3+),exhibits promising application potential in the detec-tion of Sm3+and Ho3+.Spectral analysis reveals that the strongest emission peak of Tb3+in LP-Tb is located at 544 nm,corresponding to the 5 D4→7 F5 transition,while that of Eu3+in LP-Eu is located at 615 nm,corresponding to the 5 D0→7 F2 transition.Further analysis of LP-Tb-Eu confirms the en-ergy transfer from Tb3+to Eu3+.After introducing Sm3+(LP-Tb-Eu@Sm3+)or Ho3+(LP-Tb-Eu@Ho3+)into the LP-Tb-Eu hydrogel,the fluorescence lifetime of Tb3+is altered,confirming the energy transfer from Tb3+to Sm3+and Tb3+to Ho3+.The intensity ratio of Tb3+to Eu3+(I544/I615)shows a good linear relationship with the concentrations of Sm3+and Ho3+,enabling quantitative detection of both ions.The detection limit for Sm3+concentration is as low as 0.82 μmol·L-1,while that for Ho3+is as low as 2.94 μmol·L-1.Additionally,trace additions of Sm3+or Ho3+induce significant changes in the emission intensity and color of LP-Tb-Eu,accompanied by a strong anti-interference capability.Therefore,LP-Tb-Eu serves as an efficient,visual fluorescent sensing material for Sm3+and Ho3+detection.关键词
荧光水凝胶/稀土元素/发光/无配体/离子检测Key words
fluorescent hydrogel/rare-earth elements/luminescence/ligand-free/ion detection分类
数理科学引用本文复制引用
罗锦珂,张亚楠,周爽,林林,王哲哲,冯卓宏,郑志强..稀土掺杂硅酸钠镁锂无配体荧光水凝胶用于稀土离子检测[J].福建师范大学学报（自然科学版）,2026,42(1):39-47,9.基金项目
国家自然科学基金面上项目(12074068) （12074068）
福建省自然科学基金项目(2020J01190、2020J01194、2021J01183) （2020J01190、2020J01194、2021J01183）
福建省高校产学研联合创新项目(2023H6031) （2023H6031）
