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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

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Formation of two-dimensional micelles on graphene : a multi-scale theoretical and experimental study. / Robinson, Benjamin James; Bailey, Steven William Dennis; O'Driscoll, Luke J.; Visontai, David; Welsh, Daniel J.; Mostert, Albertus Bernardus; Mazzocco, Riccardo; Rabot, Caroline; Jarvis, Samuel; Kolosov, Oleg Victor; Bryce, Martin R.; Lambert, Colin John.

In: ACS Nano, 10.03.2017.

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@article{95236108d3b44e09a6f4383d7edd7b74,
title = "Formation of two-dimensional micelles on graphene: a multi-scale theoretical and experimental study",
abstract = "Graphene and related two-dimensional (2D) materials possess outstanding electronic and mechanical properties, chemical stability and high surface area. However, to realize graphene{\textquoteright}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 {\textquoteleft}starfish{\textquoteright} 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.",
keywords = "2D micelles, surfactants, graphene, scanning probe microscopy, molecular dynamics",
author = "Robinson, {Benjamin James} and Bailey, {Steven William Dennis} and O'Driscoll, {Luke J.} and David Visontai and Welsh, {Daniel J.} and Mostert, {Albertus Bernardus} and Riccardo Mazzocco and Caroline Rabot and Samuel Jarvis and Kolosov, {Oleg Victor} and Bryce, {Martin R.} and Lambert, {Colin John}",
note = "This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright {\textcopyright}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",
year = "2017",
month = mar
day = "10",
doi = "10.1021/acsnano.7b01071",
language = "English",
journal = "ACS Nano",
issn = "1936-0851",
publisher = "American Chemical Society",

}

RIS

TY - JOUR

T1 - Formation of two-dimensional micelles on graphene

T2 - a multi-scale theoretical and experimental study

AU - Robinson, Benjamin James

AU - Bailey, Steven William Dennis

AU - O'Driscoll, Luke J.

AU - Visontai, David

AU - Welsh, Daniel J.

AU - Mostert, Albertus Bernardus

AU - Mazzocco, Riccardo

AU - Rabot, Caroline

AU - Jarvis, Samuel

AU - Kolosov, Oleg Victor

AU - Bryce, Martin R.

AU - Lambert, Colin John

N1 - 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

PY - 2017/3/10

Y1 - 2017/3/10

N2 - 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.

AB - 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.

KW - 2D micelles

KW - surfactants

KW - graphene

KW - scanning probe microscopy

KW - molecular dynamics

U2 - 10.1021/acsnano.7b01071

DO - 10.1021/acsnano.7b01071

M3 - Journal article

JO - ACS Nano

JF - ACS Nano

SN - 1936-0851

ER -