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    Rights statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright ©2017 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acsnano.7b01071

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Formation of two-dimensional micelles on graphene: a multi-scale theoretical and experimental study

Research output: Contribution to journalJournal article

E-pub ahead of print
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<mark>Journal publication date</mark>10/03/2017
<mark>Journal</mark>ACS Nano
Publication statusE-pub ahead of print
Early online date10/03/17
Original languageEnglish

Abstract

Graphene and related two-dimensional (2D) materials possess outstanding electronic and mechanical properties, chemical stability and high surface area. However, to realize graphene’s potential for a range of applications in materials science and nanotechnology there is a need to understand and control the interaction of graphene with tailored high-performance surfactants designed to facilitate the preparation, manipulation and functionalization of new graphene systems. Here we report a combined experimental and theoretical study of the surface structure and dynamics on graphene of pyrene-oligoethylene glycol (OEG) -based surfactants, which have previously been shown to disperse carbon nanotubes in water. Molecular self-assembly of the surfactants on graphitic surfaces is experimentally monitored and optimized using a graphene coated quartz crystal microbalance in ambient and vacuum environments. Real-space nanoscale resolution nanomechanical and topographical mapping of sub-monolayer surfactant coverage, using ultrasonic and atomic force microscopies both in ambient and ultra-high vacuum, reveals complex, multi-length-scale self-assembled structures. Molecular dynamics simulations show that at the nanoscale these structures, on atomically-flat graphitic surfaces, are dependent upon the surfactant OEG chain length and are predicted to display a previously unseen class of 2D self-arranged ‘starfish’ micelles (2DSMs).

Whilst three-dimensional micelles are well known for their widespread uses ranging from microreactors to drug-delivery vehicles, these 2DSMs possess the highly desirable and tunable characteristics of high surface affinity coupled with unimpeded mobility, opening up strategies for processing and functionalizing 2D materials.

Bibliographic note

This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright ©2017 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acsnano.7b01071