Article Dans Une Revue Langmuir Année : 2008

Polymer brushes grafted to "passivated" silicon substrates using click chemistry

Roxana-Viorela Ostaci
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Denis Damiron
  • Fonction : Auteur
Simona Capponi
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Guillaume Vignaud
Eric Drockenmuller
  • Fonction : Auteur correspondant
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Résumé

We present herein a versatile method for grafting polymer brushes to passivated silicon surfaces based on the Cu(I)-catalyzed Huisgen 1,3-dipolar cycloaddition (click chemistry) of co-azido polymers and alkynyl-functionalized silicon substrates. First, the "passivation" of the silicon substrates toward polymer adsorption was performed by the deposition of an alkyne functionalized self-assembled monolayer (SAM). Then, three tailormade ω-azido linear brush precursors, i.e., PEG-N3, PMMA-N 3, and PS-N3 (Mn ∼20 000 g/mol), were grafted to alkyne-functionalized SAMs via click chemistry in tetrahydrofuran. The SAM, PEG, PMMA, and PS layers were characterized by ellipsometry, scanning probe microscopy, and water contact angle measurements. Results have shown that the grafting process follows the scaling laws developed for polymer brushes, with a significant dependence over the weight fraction of polymer in the grafting solution and the grafting time. The chemical nature of the brushes has only a weak influence on the click chemistry grafting reaction and morphologies observed, yielding polymer brushes with thickness of ca. 6 nm and grafting densities of ca. 0.2 chains/nm2. The examples developed herein have shown that this highly versatile and tunable approach can be extended to the grafting of a wide range of polymer (pseudo-) brushes to silicon substrates without changing the tethering strategy.

Dates et versions

hal-04896775 , version 1 (20-01-2025)

Identifiants

Citer

Roxana-Viorela Ostaci, Denis Damiron, Simona Capponi, Guillaume Vignaud, Liliane Léger, et al.. Polymer brushes grafted to "passivated" silicon substrates using click chemistry. Langmuir, 2008, 24 (6), pp.2732-2739. ⟨10.1021/la703086x⟩. ⟨hal-04896775⟩
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