Tb3+ tuning AIE self-assembly of copper nanoclusters for sensitively sensing trace fluoride ions

氟化物 跟踪(心理语言学) 离子 纳米团簇 材料科学 纳米技术 光电子学 无机化学 化学 冶金 有机化学 语言学 哲学
作者
Xue Li,Xiaodan Zhang,Haiyan Cao,Yuming Huang,Ping Feng
出处
期刊:Sensors and Actuators B-chemical [Elsevier]
卷期号:342: 130071-130071 被引量:27
标识
DOI:10.1016/j.snb.2021.130071
摘要

The Tb 3+ triggered self-assembly of GSH-CuNCs caused over 260-fold FL enhancement and 14-fold quantum yield increase, and this finding results in a new sensitive and selective assay for trace fluoride ions in aqueous media. • Tb 3+ caused self-assembly of CuNCs to produce aggregated ones with 260-fold FL rise. • Relative to disperse CuNCs, the Tb 3+ -CuNCs show 14-fold enhancement in QY. • Compared to CuNCs, the Tb 3+ -CuNCs show better stability and high salt stability. • A highly sensitive and selective FL sensor was developed for F- ions. • The method was successfully applied to determine F − in real samples. Tb 3+ ions induce highly emissive copper nanoclusters (CuNCs) from weakly luminescent glutathione (GSH)-CuNCs driven by aggregation induced emission (AIE) mediated self-assemblies. The latter were fabricated via a one-step route utilizing GSH as both a reductant and a stabilizing agent. Complexation of Tb 3+ with the carboxyl groups of GSH on the surface of GSH-CuNCs reduces nonradiative relation of the excited state(s) by restricting the intramolecular rotation-vibrational motion. This allows the formation of the highly red emissive Tb 3+ -CuNCs with over 260-fold emission increase. Moreover, the Tb 3+ -CuNCs exhibit increased long-term storage stability and a 14-fold increase in quantum yield relative to the GSH-CuNCs. The intense red fluorescence from Tb(III)-CuNCs is quenched by F − ions because of strong Tb 3+ coordination with F − . On this basis, a new assay was constructed to selectively and sensitively detect F − ions. The limit of detection (LOD) for F − is 10 nM, which is lower than that stipulated by the World Health Organization (63.16 μM in drinking water). The Tb(III)-CuNCs-based fluorescence assay was applied to determine F − in real samples with satisfactory result.
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