Imperial College London
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DrHeatherAu

Faculty of Engineering, Department of Chemical Engineering

Royal Society University Research Fellow
 
 
 
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h.au13

 
 
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Location

 

408Roderic Hill BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Rubio:2021:10.1039/d1sc01958a,
author = {Rubio, N and Au, H and Coulter, GO and Guetaz, L and Gebel, G and Mattevi, C and Shaffer, MSP},
doi = {10.1039/d1sc01958a},
journal = {Chemical Science},
pages = {1--13},
title = {Effect of graphene flake size on functionalisation: quantifying reaction extent and imaging locus with single Pt atom tags},
url = {http://dx.doi.org/10.1039/d1sc01958a},
volume = {12},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Here, the locus of functionalisation on graphene-related materials and the progress of the reaction is shown to depend strongly on the starting feedstock. Five characteristically different graphite sources were exfoliated and functionalized using a non-destructive chemical reduction method. These archetypical examples were compared via a model reaction, grafting dodecyl addends, evaluated with TGA-MS, XPS and Raman data. A general increase in grafting ratio (ranging from 1.1 wt% up to 25 wt%) and an improvement in grafting stoichiometry (C/R) were observed as flake radius decreased. Raman spectrum imaging of the functionalised natural flake graphite identified that grafting is directed towards flake edges. This behaviour was further corroborated, at atomistic resolution, by functionalising the graphene layers with bipyridine groups able to complex single platinum atoms. The distribution of these groups was then directly imaged using aberration-corrected HAADF-STEM. Platinum atoms were found to be homogeneously distributed across smaller graphenes; in contrast, a more heterogeneous distribution, with a predominance of edge grafting was observed for larger graphites. These observations show that grafting is directed towards flake edges, but not necessary at edge sites; the mechanism is attributed to the relative inaccessibility of the inner basal plane to reactive moieties, resulting in kinetically driven grafting nearer flake edges. This phenomenology may be relevant to a wide range of reactions on graphenes and other 2d materials.
AU  - Rubio,N
AU  - Au,H
AU  - Coulter,GO
AU  - Guetaz,L
AU  - Gebel,G
AU  - Mattevi,C
AU  - Shaffer,MSP
DO  - 10.1039/d1sc01958a
EP  - 13
PY  - 2021///
SN  - 2041-6520
SP  - 1
TI  - Effect of graphene flake size on functionalisation: quantifying reaction extent and imaging locus with single Pt atom tags
T2  - Chemical Science
UR  - http://dx.doi.org/10.1039/d1sc01958a
UR  - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000714701800001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://pubs.rsc.org/en/content/articlelanding/2021/SC/D1SC01958A
UR  - http://hdl.handle.net/10044/1/99915
VL  - 12
ER  -
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