Issue 26, 2021, Issue in Progress

Silicon-based fluorescent platforms for copper(ii) detection in water


The potential of silicon-based fluorescent platforms for the detection of trace toxic metal ions was investigated in an aqueous environment. To this aim, silicon chips were first functionalized with amino groups, and fluorescein organic dyes, used as sensing molecules, were then covalently linked to the surface via formation of thiourea groups. The obtained hybrid heterostructures exhibited high sensitivity and selectivity towards copper(II), a limit of detection compatible with the recommended upper limits for copper in drinking water, and good reversibility using a standard metal–chelating agent. The fluorophore–analyte interaction mechanism at the basis of the reported fluorescence quenching, as well as the potential of performance improvement, were also studied. The herein presented sensing architecture allows, in principle, tailoring of the selectivity towards other metal ions by proper fluorophore selection, and provides a favorable outlook for integration of fluorescent chemosensors with silicon photonics technology.

Graphical abstract: Silicon-based fluorescent platforms for copper(ii) detection in water

Supplementary files

Article information

Article type
06 Apr 2021
19 Apr 2021
First published
26 Apr 2021
This article is Open Access
Creative Commons BY license

RSC Adv., 2021,11, 15557-15564

Silicon-based fluorescent platforms for copper(II) detection in water

M. Oggianu, C. Figus, S. Ashoka-Sahadevan, N. Monni, D. Marongiu, M. Saba, A. Mura, G. Bongiovanni, C. Caltagirone, V. Lippolis, C. Cannas, E. Cadoni, M. L. Mercuri and F. Quochi, RSC Adv., 2021, 11, 15557 DOI: 10.1039/D1RA02695J

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