Optical fiber sensor for Hg(II) based on carbon dots

Gonçalves, Helena M. R.; Duarte, Abel J.; Silva, Joaquim C. G. Esteves da

http://hdl.handle.net/10400.22/3034

Utilize este identificador para referenciar este registo.

Nome:	Descrição:	Tamanho:	Formato:
ART_HelenaGoncalves_2010_GRAQ.pdf		96.21 KB	Adobe PDF	Ver/Abrir

Contacte-nos

Autores

Gonçalves, Helena M. R.

Duarte, Abel J.

Silva, Joaquim C. G. Esteves da

Resumo(s)

An optical fiber sensor for Hg(II) in aqueous solution based on sol–gel immobilized carbon dots nanoparticles functionalized with PEG200 and N-acetyl-l-cysteine is described. This sol–gel method generated a thin (about 750 nm), homogenous and smooth (roughness of 2.7±0.7 a˚ ) filmthat immobilizes the carbon dots and allows reversible sensing of Hg(II) in aqueous solution. A fast (less than 10 s), reversible and stable (the fluorescence intensity measurements oscillate less than 1% after several calibration cycles) sensor system was obtained. The sensor allow the detection of submicron molar concentrations of Hg(II) in aqueous solution. The fluorescence intensity of the immobilized carbon dots is quenched by the presence of Hg(II) with a Stern-Volmer constant (pH = 6.8) of 5.3×105M−1.

Palavras-chave

Carbon dots Fiber optics Sol–gel immobilization Mercury(II) sensing

URI

http://hdl.handle.net/10400.22/3034

Editora

Elsevier

DOI

10.1016/j.bios.2010.07.018

Coleções

ISEP – GRAQ – Artigos

Métricas Alternativas

Ver registo completo