Layer-by-layer immobilization of carbon dots fluorescent nanomaterials on single optical fiber |
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Authors: | Helena MR Gonçalves Abel J Duarte Frank Davis Seamus PJ Higson Joaquim CG Esteves da Silva |
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Institution: | 1. Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, R. Campo Alegre 687, 4169-007 Porto, Portugal;2. REQUIMTE, Instituto Superior de Engenharia do Porto, R. António Bernardino Almeida 431, 4200-072 Porto, Portugal;3. Cranfield Health, Cranfield University, Bedford MK43 0AL, UK |
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Abstract: | We report within this paper the development of a fiber-optic based sensor for Hg(II) ions. Fluorescent carbon nanoparticles were synthesized by laser ablation and functionalized with PEG200 and N-acetyl-l-cysteine so they can be anionic in nature. This characteristic facilitated their deposition by the layer-by-layer assembly method into thin alternating films along with a cationic polyelectrolyte, poly(ethyleneimine). Such films could be immobilized onto the tip of a glass optical fiber, allowing the construction of an optical fluorescence sensor. When immobilized on the fiber-optic tip, the resultant sensor was capable of selectively detecting sub-micromolar concentrations of Hg(II) with an increased sensitivity compared to carbon dot solutions. The fluorescence of the carbon dots was quenched by up to 44% by Hg(II) ions and interference from other metal ions was minimal. |
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Keywords: | Carbon dots Nanoparticles Layer-by-layer immobilization Single optical fiber Mercury sensor |
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