Layer-by-layer immobilization of carbon dots fluorescent nanomaterials on single optical fiber

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

goncalves, hmr (Autor) Outra; duarte, aj (Autor) Outra; davis, f (Autor) Outra; higson, spj (Autor) Outra; da silva, jcge (Autor) FCUP

Revista

Título: Analytica Chimica Acta

Vol. 735

Páginas: 90-95

ISSN: 0003-2670

Editora: Elsevier

Indexação

ISI Web of Knowledge - 45 Citações

Scopus - 53 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-002-7XN

DOI: 10.1016/j.aca.2012.05.015

Abstract (EN): 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 PEG(200) 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6