Stretchable and Biodegradable Thermally Expandable Composites with Microfluidics for On‐Demand and Programmable Destruction of Electronics

Abstract The lifespan of the transient electronic system can be determined in advance (i.e., predefined) or controlled via on‐demand and programmable approaches using a diverse range of principles. However, in most cases, dissolution or disappearance requires an aqueous solution and is only possible for the entire system, not for specific or targeted components. Here, a soft, stretchable, thermally expandable system is introduced for precise, localized, on‐demand deactivation or destruction of electronic systems. The incorporation of thermal expansion particles into a polymer matrix produces soft, resilient composites that generate substantial thermo‐mechanical forces at a predefined temperature, enabling the direct collapse of electronic devices. Integration with multichannel microfluidics and wireless systems creates a vanishing, self‐destructive optoelectronic system and bio‐safe drug delivery vehicle for frequency‐based selective release, demonstrating the broad potential of this approach in the fields of defense/security and biomedical devices as well as other envisioned areas.