11-Mercaptoundecanoic acid functionalized gold nanoclusters as fluorescent probes for the sensitive detection of Cu2+ and Fe3+ ions |
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| Authors: | Zhiqun Bai Xiangling Ren Zhen Gong Chenxi Hao Yongmei Chen Pingyu Wan Xianwei Meng |
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| Affiliation: | a National Fundamental Research Laboratory of New Hazardous Chemicals, Beijing University of Chemical Technology, Beijing 100029, China;
b Laboratory of Controllable Preparation and Application of Nanomaterials, CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | Metal ions are physiologically essential, but excessive metal ions may cause severe risk to plants and animals. Here, we prepared gold nanoclusters (Au NCs) protected by 11-mercaptoundecanoic acid (11- MUA), which have excellent fluorescence properties for the detection of metal ions. The results showed that the copper ions (Cu2+) and iron ions (Fe3+) in the solution have obvious quenching effect on the fluorescence intensity of Au NCs. The detection range of Fe3+ was 0.8-4.5 mmol/L (R2=0.992) and 4.5- 11.0 μmol/L (R2=0.997). And Cu2+ has a lower linear range (0.1-1.0 μmol/L, R2=0.993). When EDTA was added into the reaction system, it was observed that the quenching effect of Cu2+ and Fe3+ on Au NCs showed different phenomenon. Then, the effect of metal ions on the fluorescence of Au NCs was investigated. The selective detection of Cu2+ was achieved by EDTA masking of Fe3+. In addition, we realized the metal ions detection application of Au NCs in the serum |
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| Keywords: | Gold nanoclusters Copper ions Iron ions Detection |
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