Abstract: This study analyzed the sensing ability of carbon nanotubes and grapheme modified epoxy resin. The mass fraction of carbon nanotubes (CNTs) was fixed at 0.3%. The resistivity and sensitivity of the composites with different graphene content were obtained by changing the content of C and M graphene. The results show that the threshold range of C-graphene composites is 11%~15%. When the content of C-graphene is 11%, the sample has the best pressure-sensitivity and the least noise. When the dosage is 15%, the best tensile property is obtained. And, when the stress is 1.25 MPa, the maximum rate of resistance change is 0.89%. The threshold range for M-grade graphene nanotubes composites is 3%~6%. When the content of M graphene is 3%, the maximum rate of resistance change of pressure-sensitive specimen is 3.21%, but the phenomenon of hysteresis is serious. When the content of M-graphene is 5%, the tensile sensitivity is the best and the noise is the least. Under the same dispersion process, M-grade graphene is superior to C grade graphene.

Key words: composites, carbon nanotube, graphene, piezoresistivity, alertness