• • Tensile strength of 26.76 MPa and elongation at break of 2000%: These mechanical properties exceed those of conventional photonic elastomers (e.g., 4.7 MPa for PS@SiO2 colloidal PC elastomers), enabling durable performance in load-bearing flexible sensors and robotic skins where repeated deformation previously caused structural failure.
• • Reversible color transitions under 0–70% strain and solvent exposure (water, ethanol): The inverse opal structure modulates lattice spacing, providing sensitive optical readouts for strain and solvent detection. This dual-responsiveness is critical for environmental monitoring and anti-counterfeiting, where single-stimulus materials fail to provide multiplexed authentication.
• • Self-healing via dynamic S–S bonds and hydrogen bonds: The STPU matrix recovers structural integrity after mechanical damage, extending service life and reducing replacement costs in continuous sensing applications. This addresses the sustainability bottleneck of traditional PCs, which lose structural color upon repeated cycling.
• • Incorporation of polyacrylamide hydrogel and carbon nanotubes interpenetrating network: This enhances strain sensitivity and color stability, mitigating signal drift in long-term monitoring. The composite design enables reliable operation in flexible electronics, where hysteresis and degradation are common failure modes.