Among many flexible mechanosensors, a crack-based sensor inspired by a spider's slit organ has received considerable attention due to its great sensitivity compared to previous strain sensors. The sensor's limitation, however, lies on its vulnerability to stress concentration and the metal layers' delamination. To address this issue of vulnerability, we used fluorinated ethylene propylene (FEP) as an encapsulation layer on both sides of the sensor. The excellent waterproof and chemical resistance capability of FEP may effectively protect the sensor from damage in water and chemicals while improving the durability against friction.
Funding: This material is based on work supported by the Ministry of Trade, Industry and Energy (MOTIE, Korea) under the Industrial Technology Innovation Program. No. 20000512, \u201cDevelopment of Task Planning, Gripping and Manipulation Technologies of Deformable Objects based on Machine Learning for Manufacturing and Logistical Process\u201d, and by the Environmental Health Action Program (Title: Development of Receptor-based Environment-induced Diseases Prevention and Management System Using Real-time Collected Environment and Health Information; Project No. 2018001350005) by Ministry of Environment, Republic of Korea. Daeshik Kang, Seungyong Han, and Je-sung Koh acknowledge financial support by the new faculty research fund of Ajou University and the Ajou University research fund. Daeshik Kang and Seungyong Han acknowledge financial support by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2016R1C1B1009689 and 2017R1A2B1009314).
