Visual detection of Al ions using conjugated copolymer-ATP supramolecular complex |
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| Authors: | Meng-Che Tu Deepa Rajwar Gopal Ammanath Palaniappan Alagappan Umit Hakan Yildiz Bo Liedberg |
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| Affiliation: | 1. Center for Biomimetic Sensor Science, Nanyang Technological University, Singapore 637553, Singapore;2. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore;3. Nanyang Institute of Technology in Health and Medicine, Interdisciplinary Graduate School, Nanyang Technological University, Singapore 637553, Singapore;4. Department of Chemistry, Izmir Institute of Technology, Izmir, Turkey;5. Stanford University School of Medicine, Palo Alto, CA 94304, United States |
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| Abstract: | A colorimetric Al3+ sensor based on fluorescence recovery of a conjugated copolymer-ATP complex is proposed. An optimized ratio of two polythiophene (PT) monomers is utilized to synthesize copolymer (CP) that yielded maximized colorimetric response for Al3+ in deionized (DI) and tap water. The electrostatic disassembly of CP-ATP upon addition of Al3+ led to an evident visual color change. The lowest concentration of Al3+ for naked eye observation is around 4 μM, which is below the threshold levels in drinking water according to European Economic Community (EEC) standard. Besides, the proposed assay showed a similar response to Al3+ in tap water. The proposed methodology showed selective and sensitive detection for Al3+ in analytically relevant concentration ranges without involving sophisticated instrumentation, illustrating the applicability for on-site drinking water monitoring. |
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| Keywords: | Aluminum ion sensors Conjugated polymer-ATP supramolecular complex Naked eye detection |
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