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dc.contributor.authorAwaja, Firas
dc.contributor.authorTripathi, Manoj
dc.contributor.authorWong, Tsz‐Ting
dc.contributor.authorO'Brien, Timothy
dc.contributor.authorSperanza, Giorgio
dc.identifier.citationAwaja, Firas, Tripathi, Manoj, Wong, Tsz-Ting, O'Brien, Timothy, & Speranza, Giorgio. (2018). The chemistry and topography of stabilized and functionalized graphene oxide coatings. Plasma Processes and Polymers, 15(10), 1800084. doi: 10.1002/ppap.201800084en_IE
dc.description.abstractGraphene oxide (GO) thin films and coatings are regarded as superior in quality to other materials especially for biomedical applications. However, the lack of stability and understanding of their structure and defects hinder their use in value added applications. Here, we describe our successful attempt at stabilizing, reducing and functionalizing GO through multiple plasma treatments with polymerizing (to deposit a crosslinking and compressing layer of diamond like carbon, DLC) and non‐polymerizing precursors (H2, O2, and N2). The hybrid GO and DLC coatings on semi crystalline PEEK were evaluated using AFM, SEM, and XPS. The GO deposited layer showed roughness around 70 nm and, despite care, resulted in several wrinkles and particle aggregations. The hybrid coatings conformed to the roughness and crystalline features of PEEK. XPS showed that the DLC layer cross‐linked the GO nano‐flakes while not completely masking which enable the partial exposure of GO. The GO‐DLC hybrid interface is higher in thickness than the PEEK‐GO and is dominating the overall thickness of the hybrid structure ≈13 ± 1 μm. XPS measurements showed that the often unstable CO functional groups on the surface of the hybrid coating can be reduced by effective plasma treatment. Plasma treatments also generated CO functional groups that probably originated from the decomposed carboxyl groups. The plasma treatment also contributed to the reduction of GO. Treatment with H2 was more effective in oxygen reduction than with the N2, however, treatment with N2 increased the reactants on GO as N2 is heavier tending to deposit more on a surface. Plasma treatment with O2 increased the surface oxygen content further and hence more defects on the hybrid surface.en_IE
dc.description.sponsorshipThis publication has emanated from research conducted with the financial support of Science Foundation Ireland (SFI) and is co-funded under the European Regional Development Fund under Grant Number 13/RC/2073. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 713690. FA would also acknowledge funding from the FWF under the Lise Meitner program (M-1777).en_IE
dc.relation.ispartofPlasma Processes And Polymersen
dc.subjectGraphene oxideen_IE
dc.subjectthin filmsen_IE
dc.subjectmolecular structuresen_IE
dc.titleThe chemistry and topography of stabilized and functionalized graphene oxide coatingsen_IE
dc.contributor.funderScience Foundation Irelanden_IE
dc.contributor.funderEuropean Regional Development Funden_IE
dc.contributor.funderHorizon 2020en_IE
dc.local.contactFiras Awaja, -. - Email:
dcterms.projectinfo:eu-repo/grantAgreement/SFI/SFI Research Centres/13/RC/2073/IE/C�RAM - Centre for Research in Medical Devices/en_IE
dcterms.projectinfo:eu-repo/grantAgreement/EC/H2020::MSCA-COFUND-FP/713690/EU/Career Development and Mobility Fellowships in Medical Device Research and Development: A CÚRAM Industry-Academia Training Initiative./MedTrainen_IE
dcterms.projectinfo:eu-repo/grantAgreement/FWF/Meitner-Programm/M 1777/AT/Osteointegration of Polymer Composites for Medical Implants/en_IE

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