Cu(II) detection at a carbon paste electrode modified by amorphous and ordered cyclam-functionalized mesoporous silica

Stéphanie Goubert-Renaudin 1Mathieu Etienne 1Yohann Rousselin 2Frank Denat 2Michel Meyer 2Alain Walcarius 1

1. Laboratoire de Chimie Physique et Microbiologie pour l'Environnement (LCPME), 405, rue de Vandoeuvre, Nancy 54600, France
2. CNRS-Université de Bourgogne, ICMUB (LIMRES), Dijon, Dijon 21100, France


Silica-based organic-inorganic materials combine the advantages of an inorganic backbone (mechanical stability, high porosity and possible control of pore size and 3D pore arrangement) and the chemical reactivity of organic groups [1]. Both organic and inorganic properties have strong influence on the adsorption of heavy metals in aqueous solution. Modifying electrodes with such materials can lead to an improvement of the sensitivity and selectivity of the sensor due to the preconcentration of the target analytes at open-circuit prior to their electrochemical detection by anodic stripping voltammetry [2,3]. Among polyazamacrocycles, cylam displays very interesting properties for sensing applications. It forms stable complexes with a large number of transition metals, in particular copper(II), and the complex properties can be tuned by a judicious choice of the organic groups attached to the macrocycle [4,5]. In the present work, cyclam molecules have been grafted onto the surface of silica materials displaying ordered (SBA15) and amorphous (K60) mesoporosity. Both hybrid materials have been dispersed in a carbon paste and the resulting modified electrodes have been successfully exploited for voltammetric detection of copper(II). The strong binding properties of cyclam towards Cu(II) species are kept when bound to silica and cyclam-functionalized silica acts as a powerful preconcentration agent. Surprisingly, a well-ordered silica does not improve significantly the electrode response, suggesting that the accumulation process may be restricted by chemical reactivity of immobilized cyclam towards Cu(II), rather than diffusion of the analyte into the silica network. The influence of interfering species (CoII, NiII, CrIII, …) on the electrochemical detection of Cu(II) and the analytical characteristics of the sensor have been studied.

[1] A. Walcarius, Chem. Mater., 13, 3351 (2001)

[2] A. Walcarius, M. Etienne, S. Sayen, B. Lebeau, Electroanalysis, 15, 414 (2003)

[3] M. Etienne, J. Bessière, A. Walcarius, Sens. Actuators B, 76, 531 (2001)

[4] F. Denat, S. Brandès, R. Guilard, Synlett., 561 (2000)

[5] M. Meyer, V. Dahaoui-Gindrey, C. Lecomte, R. Guilard, Coord. Chem. Rev., 1313, 178 (1998)

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: must be provided.


Related papers
  1. Hybrid Sol-Gel Materials for Bioelectrochemical Applications
  2. Electrochemically Assisted Sol-Gel Bioencapsulation on Carbon Nanotubes Network
  3. Electrochemically Assisted Encapsulation of Bacteria in Sol-Gel Thin Films
  4. Silica-based mesoporous materials in electroanalysis: interests and limitations
  5. Electro-assisted generation of sol-gel thin films directed to electrochemical sensing
  6. Shearforce-based distance control in scanning electrochemical microscopy
  7. Heavy metal uptake and ion exchange properties of functionalized mesoporous silica materials

Presentation: Poster at SMCBS'2007 International Workshop, by Stéphanie Goubert-Renaudin
See On-line Journal of SMCBS'2007 International Workshop

Submitted: 2007-10-10 11:42
Revised:   2009-06-07 00:44
© 1998-2021 pielaszek research, all rights reserved Powered by the Conference Engine