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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Silicon-based fluorescent platforms for copper(ii) detection in water.

Mariangela Oggianu1,2, Cristiana Figus3, Suchithra Ashoka-Sahadevan1,2

  • 1Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Complesso Universitario di Monserrato I-09042 Monserrato (CA) Italy mercuri@unica.it.

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This study developed a silicon-based fluorescent sensor for detecting toxic copper(II) ions in water. The sensor shows high sensitivity and selectivity, offering a promising tool for environmental monitoring and water safety.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Environmental Science

Background:

  • Toxic metal ion detection is crucial for environmental and human health monitoring.
  • Existing methods for trace metal ion detection often face challenges in sensitivity, selectivity, or cost.
  • Silicon-based platforms offer potential for miniaturized and integrated sensing devices.

Purpose of the Study:

  • To investigate silicon-based fluorescent platforms for detecting trace toxic metal ions in aqueous environments.
  • To develop a sensitive and selective sensor for copper(II) ions.
  • To explore the potential for integrating fluorescent chemosensors with silicon photonics.

Main Methods:

  • Functionalization of silicon chips with amino groups.
  • Covalent linkage of fluorescein dyes to the silicon surface via thiourea groups.
  • Characterization of the hybrid heterostructures and their interaction with copper(II) ions.

Main Results:

  • The developed sensor demonstrated high sensitivity and selectivity for copper(II) ions.
  • The limit of detection for copper(II) was compatible with drinking water standards.
  • The sensor exhibited good reversibility using a metal-chelating agent, and the fluorescence quenching mechanism was elucidated.

Conclusions:

  • Silicon-based fluorescent platforms are effective for trace toxic metal ion detection.
  • The sensing architecture can be tailored for detecting other metal ions by selecting appropriate fluorophores.
  • This approach holds promise for the integration of fluorescent chemosensors with silicon photonics technology.