A hydroplastic foaming method fabricates graphene aerogels and constructs a tactile sensor to outperform human finger.

Aerogels are known for their high porosity and very low density and can be made from a range of materials, but are limited by structural instability under extreme thermomechanical conditions. We report on 194 types of dome-celled ultralight aerogels that maintain superior elasticity spanning from 4.2 kelvin (K) to 2273 K, realized by a two-dimensional channel–confined chemistry method. Such aerogels exhibit superelasticity under 99% strain for 20,000 cycles and thermal shock resistance at 2273 K over 100 cycles. The high-entropy carbide aerogel achieves a thermal conductivity of 53.4 mW·m ⁻¹ ·K ⁻¹ at 1273 K and 171.1 mW·m ⁻¹ ·K ⁻¹ at 2273 K. The combination of temperature-invariant elasticity and chemical diversity makes such aerogels highly promising for extreme thermomechanics, from heat-insulated industries to deep space exploration.

Graphene monoliths with high porosity inherit extraordinary properties of graphene and establish a versatile platform to integrate diverse materials for multifunctional applications. To date, many methods have been invented to prepare graphene monoliths, including freeze-drying and templating, but these predominantly rely on fluid-based process. Direct thermoplastic foaming for graphene monoliths, as seen in the polymer industry, remains undeveloped. Here, we demonstrate a direct thermoplastic foaming strategy of a graphene monolith with high elasticity and multifunctionality. The intercalation of polymers enables the thermal plasticity of graphene oxide complex solids and allows precise control of the cellular structure of the graphene monolith. The direct thermoplastic foaming method is applicable to graphene monolith bulks, 3D-printed structures, and other 2D-nanosheets monoliths. This approach provides a facile, nontoxic, rapid and low-cost route for the industrial production of monoliths comprising graphene and various nanomaterials.