Molten Salt Synthesis of K2Ti6O13 Nanowires for High-Performance Microwave Absorption

K2Ti6O13 nanowires were successfully synthesized via a facile molten-salt method. The phase purity, morphological features, and electromagnetic properties of the as-prepared products were examined via XRD, SEM, and vector network analyser. The sample calcined at 900 °C exhibits outstanding microwave absorption performance, achieving a minimum reflection loss (RLmin) of −59.80 dB at 12.1 GHz with a matching thickness of 2.17 mm and an effective absorption bandwidth of 8.65 GHz. Notably, both the optimal reflection loss and the effective absorption bandwidth surpass most of the reported Ti-based microwave absorbing materials. Electromagnetic analysis indicates that the superior microwave absorption performance can be attributed to the synergistic effects of the one-dimensional nanostructure, dielectric attenuation, and favorable impedance matching. Furthermore, CST-based radar cross section simulations demonstrate that the K2Ti6O13 nanowires effectively suppress electromagnetic scattering intensity, further confirming their excellent electromagnetic attenuation capability under far-field conditions. The excellent microwave absorption performance of K2Ti6O13 nanowires suggests that they hold great promise for applications in advanced microwave absorption devices.