Superhydrophobic, Transparent, and Stretchable 3D Hierarchical Wrinkled Film‐Based Sensors for Wearable Applications

Advanced Materials TechnologiesVolume 4, Issue 10 1900230 Full Paper Superhydrophobic, Transparent, and Stretchable 3D Hierarchical Wrinkled Film-Based Sensors for Wearable Applications Bichitra Nanda Sahoo, Bichitra Nanda Sahoo Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, 03722 Republic of KoreaSearch for more papers by this authorJanghoon Woo, Janghoon Woo Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, 03722 Republic of KoreaSearch for more papers by this authorHassan Algadi, Hassan Algadi Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, 03722 Republic of KoreaSearch for more papers by this authorJaehong Lee, Jaehong Lee Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETZ F75, Gloriastrasse 35, 8092 Zurich, SwitzerlandSearch for more papers by this authorTaeyoon Lee, Corresponding Author Taeyoon Lee taeyoon.lee@yonsei.ac.kr orcid.org/0000-0002-8269-0257 Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, 03722 Republic of KoreaE-mail: taeyoon.lee@yonsei.ac.krSearch for more papers by this author Bichitra Nanda Sahoo, Bichitra Nanda Sahoo Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, 03722 Republic of KoreaSearch for more papers by this authorJanghoon Woo, Janghoon Woo Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, 03722 Republic of KoreaSearch for more papers by this authorHassan Algadi, Hassan Algadi Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, 03722 Republic of KoreaSearch for more papers by this authorJaehong Lee, Jaehong Lee Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETZ F75, Gloriastrasse 35, 8092 Zurich, SwitzerlandSearch for more papers by this authorTaeyoon Lee, Corresponding Author Taeyoon Lee taeyoon.lee@yonsei.ac.kr orcid.org/0000-0002-8269-0257 Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, 03722 Republic of KoreaE-mail: taeyoon.lee@yonsei.ac.krSearch for more papers by this author First published: 20 August 2019 https://doi.org/10.1002/admt.201900230Citations: 44Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract There is currently a high demand for smart wearable and flexible electronics for high-sensitivity strain sensors with good transparency, stretchability, and water-repellent characteristics. The demand for such devices, especially those that demonstrate superhydrophobicity, is constantly increasing because of their prospective wearable applications. A stretchable, superhydrophobic, and transparent polydimethylsiloxane/carbon nanotube strain sensor is fabricated by directly spraying a carbon nanotube solution onto a polydimethylsiloxane nanowrinkle substrate. Applying this coating not only provides many substrate materials with a superhydrophobic surface, but also responds to stretching, bending, and torsion—properties that benefit flexible sensor applications. The strain sensor shows high optical transparency (over 70%) and displays excellent superhydrophobicity (a water contact angle of 165 ± 2°). It shows a good response, with over 5000 stretching–relaxing cycles and 10 000 cycles with twisting angles from 0° to 20°, and is able to sense strain for stretching of up to 80%, bending of up to 140°, and rotation of up to 90°. These findings demonstrate the validity of this approach for fabricating transparent superhydrophobic materials with excellent stretchability and conductivity characteristics. Such materials show great potential for wearable devices to detect human motion, including large-scale movements, without affecting the appearance of the device. Conflict of Interest The authors declare no conflict of interest. Citing Literature Supporting Information Filename Description admt201900230-sup-0001-S1.pdf1.3 MB Supplementary admt201900230-sup-0001-S1.mp41.6 MB Supplementary Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article. Volume4, Issue10October 20191900230 RelatedInformation