Flexible, conductive, and highly pressure-sensitive graphene-polyimide foam for pressure sensor application

A reduced graphene oxide–borate compound-loaded melamine sponge/silicone rubber composite with ultra-high dielectric constant

“…Some recent studies [23][24][25] have shown that as compared to the direct mixing of graphene with a polymer matrix, the construction of a three-dimensional conductive network by the porous structure of a sponge as a template is a more effective method for the preparation of advanced functional composites for applications in the elds of sensors, exible conductors, and energy storage. Zhou et al 23 used polyurethane sponge as a template and graphene and carbon nanotubes as conductive llers for the preparation of epoxy resin composites with low density, superelasticity, high recovery rate, electroactive shape memory and reversible compressibility.…”

“…Zhou et al 23 used polyurethane sponge as a template and graphene and carbon nanotubes as conductive llers for the preparation of epoxy resin composites with low density, superelasticity, high recovery rate, electroactive shape memory and reversible compressibility. Yang et al 24 have used thermostable polyimide (PI) sponges as a template to obtain conductive reduced graphene oxide (rGO)-loaded PI sponges that display excellent mechanical stability and exibility and can be used as effective pressure sensors to measure heartbeat, joint activity, and airow. Moussa et al 25 used a commercialgrade kitchen sponge as a scaffold on which both graphene platelets (GnPs) and polyaniline (PANI) nanorods were deposited.…”

Piezoresistive Carbon Foams in Sensing Applications

“…For instance, solution cast films of polyaniline and styrene-ethylene/butylene-styrene SEBS copolymer were found to bear with piezoresistive character with moderate GFs of ∼2 (Costa et al, 2018); however, electrospun fibers of poly(3,4ethylenedioxythiophene) poly(styrenesulfonate) and polyvinyl alcohol showed GF up to ∼400 (Liu et al, 2011). Foams of intrinsically conductive materials as well as their polymer composites enrich even further the palette of piezoresistive materials providing new degrees of freedom (e.g., porosity, pore structure) to tune the mechanical and electromechanical properties (Pham et al, 2014;Liu H. et al, 2017;Ke et al, 2018;Yang et al, 2018). Such a good mechanical diversity is particularly important since the optimal transfer of strain or displacement from the object to the sensor device requires soft (or stiff) matrices for large (small) displacements or deformations of soft (stiff) objects.…”

Enhanced Thermal Transport Properties of Epoxy Resin Thermal Interface Materials

“…conductivity of the TIM, so as to obtain the minimum total TCR to meet the practical application requirements. In practical applications, the ideal TIM is required to have high thermal conductivity, and the combination of outstanding electrical 1,16 insulation, flexibility, easy processing and good design freedom. Polymers are widely used in thermal management due to their excellent properties, such as light weight, high corrosion resistance, flexible processability, excellent electrical insulation properties, mechanical and fatigue resistance.…”