The effect of conductive filler on the properties of electrically Conductive Adhesives(ECAs)

Stretchable conductive nanocomposites of low electrical percolation threshold for washable high-performance-interconnects

“…It should also be mentioned that, despite their importance, there have been only a few previous studies to report the adhesion of conductive interconnects to stretchable substrates. 33–36…”

“…In general, a large amount of metallic filler is required to achieve the high electrical conductivity, which increases the viscosity of the composites and in turn lowers their mechanical stability and adhesion to the targets. 26,32,33 Thus, a rational design that lowers the amount of metallic filler in an elastomeric matrix while maintaining the high electrical conductivity and good adhesion is indispensable for stretchable electronics. It should also be mentioned that, despite their importance, there have been only a few previous studies to report the adhesion of conductive interconnects to stretchable substrates.…”

“…It should also be mentioned that, despite their importance, there have been only a few previous studies to report the adhesion of conductive interconnects to stretchable substrates. [33][34][35][36] Here, we report a rationally designed stretchable conductive composite of high electrical conductivity and excellent adhesion to various flexible and/or stretchable substrates, which has been achieved by reducing the Ag concentration in an elastomeric matrix with the aid of boron nitride (BN) as an auxiliary filler. Due to their insulating properties, the BN fillers affect the electrical conductivity of the adhesives by tuning the effective interaction between Ag particles rather than directly participating in the electrical paths.…”

Relationship between Viscosity, Microstructure and Electrical Conductivity in Copolyamide Hot Melt Adhesives Containing Carbon Nanotubes

“…Isotropic ECAs have a high content of conductive filler that exceeds the percolation threshold and they are able to conduct current in all directions (x, y, z), unlike anisotropic and non-conductive ECAs which are conductive in only one direction [ 7 ]. Silver in the form of flakes [ 8 ], powder [ 9 ], nanowires [ 10 ] or dendrites [ 11 ] is the main type of electrically conductive filler which for a long time has been used in ECAs due to its excellent electrical conductivity and thermal stability. However, the minimum content of silver necessary to achieve a sufficient level of electrical conductivity at which a decrease in polymer resistivity is observable, varies from 25 wt % up to even 80 wt % [ 12 ].…”