Highly Selective and Sensitive Detection of Cu2+ Ions Using Ce(III)/Tb(III)-Doped SrF2 Nanocrystals as Fluorescent Probe

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• 作者：Shyam Sarkar ; Manjunath Chatti ; Venkata N. K. B. Adusumalli ; Venkataramanan Mahalingam
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 25, 2015
• 年：2015
• 卷：7
• 期：46
• 页码：25702-25708
• 全文大小：561K
• ISSN：1944-8252

文摘

We report a green synthetic approach to the synthesis of water dispersible Ce³⁺/Tb³⁺-doped SrF₂ nanocrystals, carried out using environment friendly microwave irradiation with water as solvent. The nanocrystals display strong green emission due to energy transfer from Ce³⁺ to Tb³⁺ ions. This strong green emission from Tb³⁺ ions is selectively quenched upon addition of Cu²⁺ ions, thus making the nanocrystals a potential Cu²⁺ ions sensing material. There is barely any interference by other metal ions on the detection of Cu²⁺ ions and the detection limit is as low as 2 nM. This sensing ability is highly reversible by the addition of ethylenediaminetetraacetic acid (EDTA) with the recovery of almost 90% of the original luminescence. The luminescence quenching and recovery cycle was repeated multiple times without much effect on the sensitivity. The study was extended to real world water samples and obtained similar results. In addition to the sensing, we strongly predict the small size and high luminescence of the Ce³⁺/Tb³⁺-doped SrF₂ nanocrystals can be used for bioimaging applications.