# Preparation Methods and Properties of CNT/CF/G Carbon-Based Nano-Conductive Silicone Rubber
## 1 Introduction  
In recent years, the development of flexible sensors has been focused on improving the weight, sensitivity, and response as the existing flexible sensors do not meet the actual needs. Thus, scholars worldwide have conducted significant research on the preparation technology and composite fillers of flexible sensors. [PERSON] et al. [1] prepared nanocomposite hydrogels by doping carbon nanotubes (CNTs) and grafting polyphenols on the surface of CNCs to improve their conductivity. [PERSON] et al. [2] used graphene (G) as the reinforcing agent of a porous PVDF film and synthesized a GP-PANI/PVDF nanocomposite film via in-situ polymerization. Their sensor is portable and lightweight. [PERSON] et al. [3] coated the top and bottom of a flexible porous polyvinyl alcohol ionic liquid membrane with a thin film of ethylene oxide (ITO-PET) to afford a double-layer capacitor between the electron and the film. [PERSON] et al. [4] used graphene oxide (GO) as the raw material and sprayed GO from a high-speed rotating nozzle into a coagulation bath through a dynamic wet spinning process. GO was dried at ambient pressure, and it transformed into GO aerogel spheres. [PERSON] [5] found that graphene nanoplatelets (SNPs) have been widely studied as nano-enhanced materials with enhanced mechanical, electrical, and thermal properties. Since it is a 2D material, the electrical network createdthrough the epoxy matrix is more strain sensitive than 1D and 0D materials. [PERSON] et al. [6] studied the damage mechanism of adhesive layer under shear stress, and studied the influence of defects on the damage process in the adhesive layer through the correlation between fracture surface and impedance change. The results show that f-GNP adhesive is sensitive to the deformation and damage propagation of the adhesive layer. By adding 12 wt% f-GNP into the adhesive joint without embedding defects, the ultimate strength is improved by about 74%. [PERSON] et al. [7] evaluated the electrical and mechanical properties of functionalized graphene nanoplatelet (GNP)-reinforced epoxy resin matrix composites. Studies have shown that the electrical conductivity of 12 wt% GNP-reinforced nanocomposites is about 10\({}^{-4}\) S/m, and the dispersion of GNPs in nanocomposites enhances the mechanical properties; however, due to the weak interface formed between the GNP-filled matrix and fibers in the glass, the performance of fiber composites decreased. [PERSON] et al. [8] coated MoSe2 on cellulose paper to prepare a pressure sensor with a MoSe2 nanometer that is immune to temperature changes. Although the above methods have greatly improved the sensitivity and mechanical properties of flexible sensors, they are still affected by humidity and their electrical properties need to be improved, which limits their use. To date, researchers have been exploring the preparation technology of conductive silicone rubbers, mainly studying new preparation technologies and the introduction of new conductive materials or the treatment of conductive fillers to enhance the properties of conductive silicone rubbers. At present, the mainstream is to use carbon-based fillers to conduct research to prepare conductive silicone rubber. The main carbon-based fillers include carbon black, graphene, carbon nanotubes, and carbon fibers. In research on carbon black, [PERSON] et al. [9] prepared carbon black/BR, carbon black/NR, and carbon black/methyl vinyl silicone rubbers using the mechanical blending method. They found that the same conductive filler has different percolation values due to the influence of different substrates. [PERSON] et al. [10] compounded carbon black with silicone rubber as the conductive filler, and they found that when the conductive filler content was 15-30 wt%, the percolation effect occurred, which significantly enhanced the mechanical and conductive properties of the composite. [PERSON] et al.