In-situ modification of nickel nanoparticles based on laser-induced graphene and their electromagnetic Properties regulation

Abstract The investigation of flexible and high-performance materials for shielding against electromagnetic interference (EMI) has consistently remained a prominent subject in the realm of electromagnetic protection. In this study, a porous graphene/nickel nanoparticle (Ni NPs) composite (LIG/Ni) with in-situ modification was fabricated via secondary laser-induced graphene (LIG). The concentration of the NiSO 4 ·6H 2 O solution could be adjusted to modify the size and amount of the Ni NPs, which would adapt the electromagnetic characteristics of the composite material. The results demonstrate that when the concentration of NiSO 4 ·6H 2 O is 0.4 mol/L, the composite material exhibits a conductivity 3.6 times that of LIG, a saturated magnetization strength 23.2 times that of LIG, and delivers an impressive 56.33 dB shielding effectiveness (SE) in the X-band. Furthermore, even after 1000 bending cycles, it retained 82.23% of its SE. The proposed secondary laser scanning method in an inert atmosphere holds promising application prospects for efficient and rapid large-scale production of flexible electromagnetic shielding materials. It is foreseeable that by altering the precursor solution and the laser scanning environment, this technique could be further expanded to achieve rapid in situ doping of various metals or metal oxides within graphene.