Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/3034
Título: Optical fiber sensor for Hg(II) based on carbon dots
Autor: Gonçalves, Helena M. R.
Duarte, Abel J.
Silva, Joaquim C. G. Esteves da
Palavras-chave: Carbon dots
Fiber optics
Sol–gel immobilization
Mercury(II) sensing
Data: 2010
Editora: Elsevier
Relatório da Série N.º: Biosensors and Bioelectronics; Vol. 26, Issue 4
Resumo: 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.
Peer review: yes
URI: http://hdl.handle.net/10400.22/3034
ISSN: 0956-5663
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0956566310003933#
Aparece nas colecções:ISEP – GRAQ – Artigos

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
ART_HelenaGoncalves_2010_GRAQ.pdf96,21 kBAdobe PDFVer/Abrir


FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Degois 

Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.