Nanoscale friction of graphene oxide over glass-fibre and polystyrene

Tripathi, Manoj, Mahmood, Haroon, Novel, David, Iacob, Erica, Vanzetti, Lia, Bartali, Ruben, Speranza, Giorgio, Pegoretti, Alessandro and Pugno, Nicola (2018) Nanoscale friction of graphene oxide over glass-fibre and polystyrene. Composites Part B: Engineering, 148. pp. 272-280. ISSN 1359-8368

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Coatings of graphene oxide over two substrates of glass-fibre and polystyrene were obtained by electrophoretic deposition (EPD). A chemical reduction of graphene oxide by exposure to hydrazine hydrate at 100 °C significantly changes the interfacial interaction with the substrate as well as the tribology. Spectroscopic techniques like Fourier transform infrared, Raman spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction showed that the treatment with hydrazine replaces oxygen functional groups and also induces roughness, a structural disorder and decreases the interlayer separation in the transition from graphene oxide (GO) to reduced graphene oxide (rGO). Treatment with hydrazine reduces adhesion and friction force against diamond like carbon coated Si probe (DLC AFM) at the basal plain of the coatings. Investigation at the edges revealed that the presence of oxygenic functional groups leads to higher shear strength with glass-fibre and polystyrene which reduces after treatment with hydrazine.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Materials Physics Group
Depositing User: Manoj Tripathi
Date Deposited: 03 Sep 2018 15:14
Last Modified: 03 Sep 2018 15:14
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