Synergistic effect of carbon nanotubes and copper particles in an epoxy-based nanocomposite using electroless copper deposited carbon nanotubes: Part I – Mechanical properties

Abstract

In this study, the mechanical properties of epoxy nanocomposites reinforced by different contents of copper (Cu)-coated multiwalled carbon nanotubes (MWCNTs) are evaluated and discussed. Electroless deposition process is employed for Cu metallization of the MWCNTs. The functionalization step (as one of the prerequisite steps for deposition process) is carried out using hybrid approach with Triton and HNO₃. The functionalized and Cu deposited MWCNTs are characterized by Fourier transform infrared, Raman spectroscopy, thermogravimetric analysis, atomic absorption spectroscopy, and scanning electron microscopy. For comparison, functionalized MWCNT–epoxy nanocomposites are also fabricated through the same fabrication process. Our results indicate that applying functionalized MWCNTs are more effective for enhancing tensile properties. On the contrary, Cu-coated MWCNT–epoxy nanocomposites show more improvement in flexural and impact behaviors. Accordingly, compared to neat epoxy, enhancement of up to ∼51% and ∼95% respectively in flexural strength and impact resistance are achieved by the addition of 0.1 wt% Cu-coated MWCNT.