Phase and morphology engineering toward promoting microwave absorption and magnetic hyperthermia of Sr–Fe–O-based nanostructures

To prepare scalable and practical materials with outstanding and reliable microwave absorbing and hyperthermia properties, a facile experimental scenario and repeatable results, the experimental procedures should be simplified and shortened. Accordingly, a one-pot method was architected, operating based on phase and morphology modification to improve microwave absorbing and hyperthermia performance. Hence, the substrates, capping agents, solvents, additives, and experimental scenarios were engineered to modify the phase and morphology. Urea, citric acid (CA), carbon microspheres (CMSs), ethylene glycol, glucose (Glu), and carbon nitride (CN) were applied as auxiliary agents, and complementary solvothermal sol–gel methods were designed to gain the best results. Intriguingly, a sustainable structure of Fe 3 O 4 , protected with Sr, was synthesized by modification of additives and experimental routes. Particularly, a green, environmentally friendly, sustainable, and capable absorbing matrix was prepared by esterification of extracted cellulose and citric acid. The fascinating maximum reflection loss (RL max ) and radar cross section (RCS) reduction were achieved. Phase and morphology engineering enhanced the magnetic and hyperthermia performance, yielding a specific absorption ratio (SAR) of 27.86 W/g at a concentration of 5 mg/mL. Significantly, the samples demonstrated moderate shielding effectiveness (SE), offering a practical solution to mitigate ambient electromagnetic pollution while remaining compatible with modern technological infrastructure.