Abstract
Surface chemistry is an important field of research, especially for the study and design of (bio)nanostructures in which nearly every atom lies at an interface. Here we show that dynamic covalent chemistry is an efficient tool for functionalizing surfaces in such a way that their interfacial properties can be varied controllably in space and time. Modulation of pH is used to tune the fast, selective and reversible attachment of functional amines (with different pKa values) to an aldehyde-coated surface. To illustrate the potential of this technique, we developed dynamic self-assembled monolayers (‘DynaSAMs’), which enable the hierarchical construction of mixed gradients comprising either small functional molecules or proteins. Control of the (bio)chemical composition at any point on the surface potentially provides a simple bottom-up method to access numerous surface patterns with a broad range of functionalities.
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Change history
08 November 2009
In the version of this Article originally published, the units on the x axes of Figs 4a and 5c should have read (mm). This has been corrected on the HTML and PDF versions of the Article.
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Acknowledgements
Dedicated to Jean-Marie Lehn on the occasion of his 70th birthday. We thank the Centre National de la Recherche Scientifique, the International Centre for Frontier Research in Chemistry and the University of Strasbourg for financial support. This work was supported by a doctoral fellowship from the French Ministry of Research (L.T.). G.D. thanks the Institut Universitaire de France. We are also grateful to E. Moulin, O. Felix, M. Maaloum, C. Contal, C. Marques and M. Basler for help at various stages.
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N.G. conceived the work and designed the experiments. L.T. performed the experiments. L.T., A.P.S., G.D. and N.G. analysed the data. A.P.S. and G.D. contributed materials and analysis tools and suggested supplementary experiments. N.G. wrote the paper. All authors discussed and commented on the manuscript.
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Tauk, L., Schröder, A., Decher, G. et al. Hierarchical functional gradients of pH-responsive self-assembled monolayers using dynamic covalent chemistry on surfaces. Nature Chem 1, 649–656 (2009). https://doi.org/10.1038/nchem.400
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DOI: https://doi.org/10.1038/nchem.400
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