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

• Type: Article in International Scientific Journal
• Date: 2012

Authors

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

Journal

Title: Analytica Chimica Acta

Vol. 735

Pages: 90-95

ISSN: 0003-2670

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 42 Citations

Scopus - 49 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6