Microstructure design is an effective strategy to realize the multifunctional integration as well as broaden the practical engineering application fields of microwave absorbing materials. Herein, a novel Co1.29Ni1.71O4/reduced graphene oxide/calcined...

source. Ko et al. construct a temperature-responsive SMP film by integrating polylactic acid (PLA) and thermoplastic polyurethane (TPU). [15] Ni et al. simply adjust the layers of graphene oxide coating on SMP to design thermal-responsive devices. [16] However, the single responsive ability cannot meet the requirement of increasingly complex and changeable application environment. [17][18][19] On the other hand, the solid planar or strip geometries of traditional SMPs limit the expansion of new horizons. [20][21][22][23] Thus, it is urgent and important to fabricate 3D porous and flexible SMPs with multiresponsive function.Recent advances have progressed to use a 3D porous material as the framework added with functional fillers to construct electrical/thermal conductive networks for achieving multi-responsive SME. [24,25] MS has aroused great interest as the 3D framework for its low cost, low density, high porosity, and great elasticity. [26] Carbonbased fillers including MXene, [27][28][29] carbon nanotubes (CNT), [30][31][32] graphene, [24,[33][34][35] and carbon black (CB) are preferred candidates for their excellent photothermal and electrothermal performance. [32,36] He et al. combine the MS framework with MXene/silver nanowires (AgNWs) to design a thermal/electrical transmissive 3D network. [37] Triple-stimuli responsive shape memory composites are obtained by injecting an SMP into the hybrid framework by vacuum impregnation. Wu et al. prepare graphene nanoplatelet (GNP) hybrid-coated MS (CG@MS) incorporated with polyethylene glycol (PEG) to realize a notable photo/electrostimuli SME. [38] However, complicated and costly methods are challenging for large-scale production. [39][40][41][42][43] Meanwhile, the poor compatibility between the 3D porous framework and the functional fillers, as well as the inhomogeneous dispersion, also pose problems.An alternative method for constructing the 3D electrical/ thermal conductive network is to carbonize the MS. [44] The obtained carbon foams (CFs) actually become brittle or fragile after high-temperature carbonization. The conductivity and photothermal activity of the CFs are also not satisfactory for initiating SME at a safe voltage or realizing photothermal conversion efficiently. [45] Herein, we propose a specific multi-step carbonization protocol for transforming commercial MS to highly porous CF with robust resilience, excellent photothermal and electrothermal properties. Owing to the super-amphiphilicity of Highly porous multi-responsive shape memory foams have unique advantages in designing 3D materials with lightweight for varied applications. Herein, a facile and efficient approach to fabricating a thermo-, electro-, and photo-responsive shape memory composite foam is demonstrated. A specific multi-step carbonization protocol is adopted for transforming commercial melamine sponge (MS) to highly porous carbon foam (CF) with robust elastic resilience, efficient electrothermal/photothermal conversions, and superamphiphilicity. It is a novel proposal for CF to ta...