@

초록

Traditional lead-based materials are becoming increasingly inadequate for advanced radiation protection. The development of high-performance lead-free shielding materials is essential to promote the safer and more efficient use of X-rays. In this study, the effect of the complementary K-edges of Cs3Bi2I9 and Gd on X-ray absorption is investigated. Gd is strategically incorporated into an aerogel through a phase-separation strategy to form a unique "photon-cage" structure. Subsequently, polydimethylsiloxane encapsulation provides the aerogels with excellent mechanical properties and thermal stability. Finally, Cs3Bi2I9 nanomaterials are introduced to produce a photon-cage-structured X-ray-shielding aerogel. This structure effectively prolongs photon residence time and promotes multiple internal scattering events, thereby effectively trapping and absorbing X-ray photons. The fabricated aerogels exhibit excellent X-ray shielding efficiencies, ranging from 76.4 to 97.3% in the 40-120 kV energy range. These findings offer a promising pathway for the development of flexible, high-efficiency, and lead-free X-ray-shielding materials.

키워드