Self-assembled monolayers of aminosilanes chemically bonded onto silicon wafers for immobilization of purified humic acids

Abstract : In this paper, we report on the covalent attachment of humic acids on silicon wafers. Monolayers of 11-amino-undecylsiloxane were prepared on silicon wafers by substitution of 11-bromo-undecylsiloxane with an azido group followed by a subsequent reduction. These substrates were coupled with humic acids via a diazotization procedure. Characterization of the functionalized surfaces was performed by different methods: ATR-FTIR, ellipsometry, AFM, TOF-SIMS and amino groups surface density was monitored by UV spectroscopy. These different methods confirmed the immobilization of humic acids on the substrates, consisting in a very useful tool for environmental applications, in particular, for determination of complexation constants between immobilized humic acid moiety and radionuclides. These miniaturized solid state system could be used as a sensitive detector for trace elements in fluid solutions or lixiviation studies in the framework of radionuclide dissemination and modelling studies from radioactive storage.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02278755
Contributeur : Cécile Barbot <>
Soumis le : mercredi 4 septembre 2019 - 15:44:31
Dernière modification le : mercredi 6 novembre 2019 - 13:21:57

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C. Barbot, O. Bouloussa, W. Szymczak, M. Plaschke, G. Buckau, et al.. Self-assembled monolayers of aminosilanes chemically bonded onto silicon wafers for immobilization of purified humic acids. Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier, 2007, 297 (1-3), pp.221-239. ⟨10.1016/j.colsurfa.2006.10.049⟩. ⟨hal-02278755⟩

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