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L’équipe CRAB en collaboration avec l’équipe du Prof. Postnikov (Tomsk Polytechnic University et University of Chemistry and Technology of Prague) a développé la polymérisation radicalaire contrôlée par les nitroxyde assistée par l’effet Plasmon (Plasmon Initiated NMP, PI-NMP). Cette technique permet le contrôle de la polymérisation radicalire sur une surface d’or nanométrique à température ambiante. L’intérêt de cette nouvelle variante de la NMP est illustrée par la préparation d’une surface d’or fonctionnalisée utilisée pour la détection SERS (surface enhanced Raman Spectroscopy).
Olga Guselnikova, Sylvain R. A. Marque, Evgeny Tretyakov, David Mares, Viterslav Jerabek, Gerard Audran, Jean-Patrick Joly, Marina Trusova, Vaclav Svorcik, Oleksiy Lyutakov, Pavel Postnikov,
Journal of Materials Chemistry A, 7 12414-12419 (2019)
A plasmon as a stimulus opens up new opportunities for selective and regulated from-surface polymerization and functionalization of surfaces. Here, the first example of plasmon-assisted nitroxide-mediated polymerization (NMP) of stimuli-responsive block copolymers poly(N-isopropylacrylamide)-co-4-vinylboronic acid is reported. The growth of a polymer film at room temperature was achieved via plasmon-induced homolysis of alkoxyamines covalently attached to the surface of plasmon-active gold gratings at room temperature. Control of temperature, finite-difference time-domain method simulation of plasmon intensity distribution shift during polymerization, electron paramagnetic resonance experiments and other assays provide strong support for the plasmon-initiated mechanism of NMP. We demonstrated not only the control of the resulting polymer thickness but also the preparation of a surface-enhanced Raman spectroscopy chip for the detection of glycoproteins as a powerful example of plasmon-assisted NMP potential.