Upcycling carbon materials from waste plastics/ resins is of utmost importance but remains challenging. In this work, we reported the production of magnetic metal nanoparticledoped laser-induced graphene (LIG/M) starting from polybenzoxazine by a combination of drop-casting and laser irradiation. This strategy was applicable to convert various metal complex precursors into nanoparticles, producing diverse LIG/M, where M included Fe 3 O 4 , FeCo, and FeNi. Due to the attractive porous structures and electric/magnetic functional characteristics, the obtained LIG/M exhibited a high electromagnetic interference (EMI) shielding effectiveness of 39.1 dB in the X-band for LIG/FeCo. Taking the thickness and lightweight properties into account, the absolute shielding effectiveness of LIG/M is superior to that of the reported metal nanoparticle-doped carbon materials, which demonstrates the advantage of LIG/M as efficient EMI shielding materials. Moreover, the high electrical conductivity and magnetic properties endowed LIG/M with low-voltage-driven electrothermal performance and strong magnetothermal effect. Given the easy-fabrication process and satisfactory performance, the strategy proposed in this work may create propitious opportunities to achieve the high value-added upcycling and reuse of waste plastics/ resins with potential applications in various fields, such as EMI shielding, energy storage, and heating systems.

To achieve clean and high‐efficiency utilization of renewable energy, functional surfaces with controllable and patternable wettability are becoming a fast‐growing research focus. In this work, a laser scribing strategy to fabricate patterned graphene surfaces that are capable of energy conversion in different forms is demonstrated. Using the laser raster‐scanning and vector‐scanning modes, two distinct surface structures are constructed on polybenzoxazine substrate, yielding a superhydrophilic (LSHL) surface and superhydrophobic (LSHB) surface, respectively. Of particular note is that the unique hierarchical structure of LSHB surface has endowed it with quite a robust superwetting behaviors. Further profiting from the flexibility of the processing method, wettability patterns with spatially resolved LSHL and LSHB regions are designed, achieving the conversion of surface energy to liquid kinetic energy. This also offers a tractable approach to fabricate wettability‐engineered devices that enable the directional, pumpless transport of water by capillary pressure gradient and the selective surface cooling via jet impingement. In addition, the LSHB surface demonstrates the high conversion of electric‐to‐thermal energy (222 °C cm2 W−1) and light‐to‐thermal energy (88%). Overall, the material system and processing method present a promising step forward to developing easy‐fabricated graphene surfaces with spatially controlled wettability for efficient energy utilization and conversion.