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Solvothermal synthesis of graphene oxide and its composites with poly(ε-caprolactone)

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Chin, Seow J., Doherty, Matthew, Vempati, Sesha, Dawson, Paul, Byrne, Cormac, Meenan, Brian J., Guerra, Valentina and McNally, Tony (2019) Solvothermal synthesis of graphene oxide and its composites with poly(ε-caprolactone). Nanoscale, 11 (40). pp. 18672-18682. doi:10.1039/C9NR04202D ISSN 2040-3364.

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Official URL: http://dx.doi.org/10.1039/C9NR04202D

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Abstract

Graphene oxide (GO) was prepared by a solvothermal synthesis method using sodium and ethanol. A sequence of pyrolysis, washing and purification steps was developed for the total removal of all by-products. The first pyrolysis step is essential to obtain graphitic forms of carbon while a washing and a second pyrolysis step further improved the graphenic structures obtained via the reduction of OH/COOH and C-O groups and the attendant increase in C=C bonding (sp2 hybridization). Two purification processes were employed to remove sodium carbonate (by-product), i.e. vacuum filtration and centrifugation, but the latter produced a more stable GO product, typically with a few-layer (ca 3nm) stack and relatively long platelets (up to ca 1.3 µm). The functionality of this GO was demonstrated by preparing composites of it with poly(ε-caprolactone) (PCL). The GO was arranged in flower-like domains dispersed in the PCL matrix. The crystalline content of PCL decreased on addition of GO, though the dynamic modulus of PCL increased and an electrical percolation at 0.5vol% GO was obtained, manifest by a ~104 increase in electrical conductivity (in an overall increase of ~105 achieved at > 1vol%), more than sufficient for anti-static applications.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Graphene , Graphene -- Oxidation, Graphene -- Industrial applications, Graphene -- Oxidation -- Synthesis
Journal or Publication Title: Nanoscale
Publisher: Royal Society of Chemistry
ISSN: 2040-3364
Official Date: 2019
Dates:
DateEvent
2019Published
20 September 2019Available
19 September 2019Accepted
Volume: 11
Number: 40
Page Range: pp. 18672-18682
DOI: 10.1039/C9NR04202D
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 23 September 2019
Date of first compliant Open Access: 20 September 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDQueen's University Belfasthttp://dx.doi.org/10.13039/501100000873

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