Properties of isotropical conductive adhesives f illed with carbon nanotubes

Two kinds of isot ropical conductive adhesives ( ICA) were developed by using carbon nanotubes (CNTs)and silver coated carbon nanotubes (SCCNTs) as conductive fillers. The elect rical , mechanical and aging propertiesof the above ICAs were investigated and compared with those of conventional ICA filled with 1μm average-sized Agparticles. The result s indicated that the percolation threshold of bulk resistivity reaches 2. 4 ×10^-3Ω·cm for ICAwith 31 % filler content of CNTs and the shear st rength of ICA with 23 % filler content of CNTs approaches themaximum value. At the same filler content of 28 % , the ICAs filled with SCCNTs show the lowest conductive resistivity of 212 ×10^-4Ω·cm and the ICAs filled with both CNTs and SCCNTs exhibit higher shear st rength of 19. 6MPa. The result s of aging properties tested under the conditions of 85 ℃, RH85 % for 1000h showed that the shif t sof both bulk resistivity and shear st rength do not exceed 10 % for the ICAs filled with both CNTs and SCCNTs ,while the shif t s of conductive resistivity and shear st rength are 350 % and 120 % , respectively , for ICA filled withmicro-sized Ag particles.