| 초록 |
As eidetic signal recognition has become important, displaying mechanical signals visually has imposed huge demands for simple readability and without complex signal processing. Accordingly, thermo- and electronic-chromic materials are considered to facilitate the visualization with multiple colors and simple process, yet the response and recovery time is very long. Here, the simple visualization of low strain ≈2%, with ultrasensitive crack-based strain sensors, which we developed before, with a hierarchical thermochromic layer is suggested. The sensor shows a gradient color change from red to white color in each strain, which is attributed to the hierarchical property, and the thermal response (recovery) time is dramatically minimized within ＜0.6 s from 45 to 37 °C, as the hierarchical membrane is inspired by termite mounds for efficient thermal management. The color changes can be delicately monitored in biomedical application with high accuracy by software on a mobile phone. |
