From Graphene to Carbon Fibres: Mechanical Deformation and Development of a Universal Stress Sensor

Abstract

Carbon fibres (CF) represent a significant volume fraction of modern structural airframes. Embedded into polymer matrices, they provide significant strength and stiffness gains over unit weight as compared to other competing structural materials. Nevertheless, no conclusive structural model yet exists to account for their extraordinary properties. In particular, polyacrynonitrile (PAN) derived CF are known to be fully turbostratic: the graphene layers are slipped sideways relative to each other, which leads to an inter-graphene distance much greater than graphite. Here, we demonstrate that CF derive their mechanical properties from those of graphene itself. By monitoring the Raman G peak shift with strain for both CF and graphene, we develop a universal master plot relating the G peak strain sensitivity of all types of CF to graphene over a wide range of tensile moduli. A universal value of - average- shift rate with axial stress of ~ -5ω0^-1 (cm^-1 MPa^-1)is calculated for both graphene and all CF exhibiting annular ("onion-skin") morphology.

25 pages, 5 figs

References in corpus (8)

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• Stress-transfer from polymer substrates to monolayer and few-layer graphenes
• Determination of the elastic moduli of CVD graphene by probing graphene/polymer Bragg stacks
• Stress intrepretation of graphene E-2g and A-1g vibrational modes: theoretical analysis
• Uniaxial strain-induced Kohn anomaly and electron-phonon coupling in acoustic phonons of graphene
• Production and mechanical characterization of graphene micro-ribbons
• Long-wavelength optical phonon behavior in uniaxial strained graphene: Role of electron-phonon interaction
• Charge Density Wave Phase Transition on the Surface of Electrostatically Doped Multilayer Graphene