Nanotechnology

Non-covalent Micro-contact Printing for Grafting Patterned Polymer Brushes on Graphene Films

Abstract

Abstract This article describes a simple and universal approach to prepare patterned polymer brushes on graphene-based substrate surfaces by micro-contact printing (μCP) of initiator molecules and subsequent surface initiated atom transfer radical polymerization (SI-ATRP) method. Four different initiators are designed and have strong adhesion with graphene-based substrates through non-covalent interaction. Optical and fluorescence microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy were used to characterize the successful polymerization of vinyl monomers on substrate surface. To demonstrate the broad applicability of this strategy, polymer brushes with different functionalities including cationic and anionic polyelectrolyte, thermally and pH responsive polymers, as well as polymer patterns on different graphene-based surfaces are fabricated. Binary polymer brushes can also be easily prepared by further initiating the initiator backfilled in the bare areas.

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Non-covalent Micro-contact Printing for Grafting Patterned Polymer Brushes on Graphene Films

Chemically orthogonal trifunctional Janus beads by photochemical “sandwich” microcontact printing

Abstract

The combination of topographic and chemical orthogonality on polymer particles by site selective immobilization of functional thiols via thiol–ene chemistry provides a trifunctional particle surface with azide and acid functionalities on opposing poles and alkenes in the equatorial area. These Janus beads are accessible for site selective orthogonal chemical reactions as well as biomolecular recognition on the same particle.

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Chemically orthogonal trifunctional Janus beads by photochemical “sandwich” microcontact printing

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