Multilayer Bioinspired Heterogeneous Superelastic Ceramic Aerogel for Robust Signal Detection Under Extreme High‐Temperature Conditions

Simultaneously achieving mechanical compliance and thermal resilience in piezoelectric sensors remains a longstanding challenge, as it requires reconciling the intrinsic brittleness of ceramics with the thermal instability of polymers. Here, we engineer a bioinspired, super‐elastic ceramic nanofiber aerogel with a hierarchical BaTiO 3 embedded in an amorphous Al 2 O 3 —SiO 2 aluminosilicate network sandwich architecture to resolve this trade‐off. Mimicking the thermoregulatory defense mechanism of desert lizard skin, this design leverages a scalable spinning self‐assembly strategy to create a mechanically confined heterostructure. The exterior entangled amorphous Al 2 O 3 ‐SiO 2 aluminosilicate (AS) fiber networks serve as a dual‐functional barrier, effectively decoupling the piezoelectric BaTiO 3 core from external thermal shocks while synergistically diffusing localized compressive stress via a multi‐layer effect. This architectural engineering enables the aerogel to sustain stable piezoelectric functionality at temperatures exceeding 800°C—far surpassing the conventional 120°C limit of BaTiO 3 . Furthermore, the aerogel exhibits an ultralow density (4.5 mg·cm −3 ), superior thermal insulation (0.029 W·m −1 ·K −1 ), and exceptional piezoelectric stability (10 000 cycles). This work addresses the trade‐off between flexibility and thermal stability in piezoelectric materials, providing a promising design strategy for durable, high‐performance sensors that operate in extreme environments.