Heat treated graphene thin films for reduced void content of interlaminar enhanced CF/PEEK composites

Abstract Graphene enhanced thermoplastic composites offer the possibility of conductive aerospace structures suitable for applications from electrostatic dissipation, to lightning strike protection and heat dissipation. Spray deposition liquid phase exfoliated (LPE) aqueous graphene suspensions are highly scalable rapid manufacturing methods automated processes. The effects residual surfactant water LPE on thin films interlaminar prepreg composite enhancement remain unknown. This work investigates effect treatment spray deposited onto carbon fibre/polyether ether ketone (CF/PEEK) reduced void content. CF/PEEK tapes had an RMS roughness 1.99 μm average contact angle 11°. After increased 2.52 with 82°. SEM images, angle, surface measurements correlated suggesting successful removal excess moisture treatment. Raman spectroscopy was used characterise chemical quality consolidated interlayer. Spectral data concluded 3–4 layered predominantly edge defects high electrical enhancement. Conductive-AFM observed increase in network density region after film. Heat Control sample successfully content 4.2 vol% 0.4 vol%, resulting a 149% compressive shear strength. Comparatively, samples (~ 1 wt%) 5.1 2.8 vol%. Although 25% reduction strength measured, improved conductivity extends potential fibre reinforced composites. process proves effective reducing thus while improving interlayer manner. Further investigations into loading enhancement, formation is needed.