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Layer-by-layer immobilization of carbon dots fluorescent nanomaterials on single optical fiber
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Orientador(es)
Resumo(s)
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.
Descrição
Palavras-chave
Carbon dots Nanoparticles Layer-by-layer immobilization Single optical fiber Mercury sensor
Contexto Educativo
Citação
Editora
Elsevier