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)

• The Raman Fingerprint of Graphene
• Uniaxial Strain in Graphene by Raman Spectroscopy: G peak splitting, Gruneisen Parameters and Sample Orientation
• Rayleigh Imaging of Graphene and Graphene Layers
• Spectroscopic ellipsometry of graphene and an exciton-shifted van Hove peak in absorption
• Optical Phonons in Carbon Nanotubes: Kohn Anomalies, Peierls Distortions and Dynamic Effects
• Subjecting a graphene monolayer to tension and compression
• Raman 2D-Band Splitting in Graphene: Theory and Experiment
• Compression Behavior of Single-layer Graphene