Carbon nanotubes and silver flakes filled epoxy resin for new hybrid conductive adhesives

• Published in: Microelectronics and reliability Vol. 51; no. 7; pp. 1230 - 1234
• Main Authors: Marcq, F., Demont, P., Monfraix, P., Peigney, A., Laurent, Ch, Falat, T., Courtade, F., Jamin, T.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier Ltd 01.07.2011; Elsevier
• Subjects: Carbon nanotubes; Chemical Sciences; Cross-disciplinary physics: materials science; rheology; Electrical conductivity; Electrical resistivity; Exact sciences and technology; Flakes; Hybrid composites; Material chemistry; Materials science; Nanoscale materials and structures: fabrication and characterization; Nanostructure; Nanotubes; Physics; Resistivity; Silver; Silver; Electrical conductivity; Composite materials; Ambient temperature; Hybrid material; Epoxy resin; Carbon nanotubes; Mechanical properties; Conducting materials; Electrical characteristic; Adhesive material; MWCNTs; SEM; DWCNTs
• ISSN: 0026-2714; 1872-941X
• DOI: 10.1016/j.microrel.2011.03.020

Combining conductive micro and nanofillers is a new way to improve electrical conductivity. Micrometric silver flakes and nanometric carbon nanotubes (CNTs) exhibit high electrical conductivity. A new type of hybrid conductive adhesives filled with silver flakes and carbon nanotubes (DWCNTs or MWCNTs) were investigated. High electrical conductivity is measured as well as improved mechanical properties at room temperature. Small agglomerates and free MWCNTs dispersed in the silver/epoxy composites improve the electrical conductivity and a synergistic effect between MWCNTs and micro sized silver flakes is observed in hybrid composites. Glassy and rubbery storage moduli of the hybrid composites increase with increasing silver loading at fixed CNTs volume fraction. High value of the storage modulus, measured in DWCNTs/μAg hybrid composites at rubbery state, is caused by strong agglomeration of DWCNTs bundles. The electrical and mechanical properties are consistent with the morphologies of the hybrid composites characterized by SEM.