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The sensilla of arthropods, comprised of unique hierarchical structures, are a representative example which inspired the development of various bioinspired systems, owing to their hypersensitive and ultrafast responsivity to mechanical and chemical stimuli. This report presents a geometry\u2010switchable and highly H<jats:sub>2<\/jats:sub>\u2010reactive Janus nanofiber (H\u2010NF) array inspired by the structural features of the arthropod sensilla. The H\u2010NF array (400 nm diameter, 4 \u00b5m height, 1.2 \u00b5m spacing distance, and hexagonal array) exhibits reversible structural deformation when exposed to a flammable concentration of hydrogen gas (4 vol% H<jats:sub>2<\/jats:sub> in N<jats:sub>2<\/jats:sub>) with fast response times (5.1 s). The structural change can be detected with the bare eye, which is a result of change in the optical transmittance due to the structural deformation of the H\u2010NF array. Based on these results, an eye\u2010readable H<jats:sub>2<\/jats:sub>\u2010sensor that requires no additional electrical apparatus is demonstrated, including wetting\u2010controllable H<jats:sub>2<\/jats:sub>\u2010selective smart surfaces and H<jats:sub>2<\/jats:sub>\u2010responsive fasteners.<\/jats:p>","DOI":"10.1002\/adfm.201701618","type":"journal-article","created":{"date-parts":[[2017,6,30]],"date-time":"2017-06-30T08:14:40Z","timestamp":1498810480000},"source":"Crossref","is-referenced-by-count":58,"title":["Bioinspired Geometry\u2010Switchable Janus Nanofibers for Eye\u2010Readable H<sub>2<\/sub> Sensors"],"prefix":"10.1002","volume":"27","author":[{"given":"Heetak","family":"Han","sequence":"first","affiliation":[{"name":"School of Electrical and Electronic Engineering Yonsei University  50 Yonsei\u2010ro Seodaemun\u2010gu Seoul 03722 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sangyul","family":"Baik","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering SKKU Advanced Institute of Nanotechnology (SAINT) Samsung Advanced Institute for Health Science &amp; Technology (SAIHST) Sungkyunkwan University (SKKU)  Seobu\u2010ro, Jangan\u2010gu Suwon Gyeonggi\u2010do 440\u2010746 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Borui","family":"Xu","sequence":"additional","affiliation":[{"name":"Department of Materials Science Fudan University  220 Handan Road Shanghai 200433 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jungmok","family":"Seo","sequence":"additional","affiliation":[{"name":"Center for Biomaterials Korea Institute of Science and Technology  14 Hwarang\u2010ro Seongbuk\u2010gu Seoul 02792 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sanggeun","family":"Lee","sequence":"additional","affiliation":[{"name":"School of Electrical and Electronic Engineering Yonsei University  50 Yonsei\u2010ro Seodaemun\u2010gu Seoul 03722 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sera","family":"Shin","sequence":"additional","affiliation":[{"name":"School of Electrical and Electronic Engineering Yonsei University  50 Yonsei\u2010ro Seodaemun\u2010gu Seoul 03722 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaehong","family":"Lee","sequence":"additional","affiliation":[{"name":"School of Electrical and Electronic Engineering Yonsei University  50 Yonsei\u2010ro Seodaemun\u2010gu Seoul 03722 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ja Hoon","family":"Koo","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering SKKU Advanced Institute of Nanotechnology (SAINT) Samsung Advanced Institute for Health Science &amp; Technology (SAIHST) Sungkyunkwan University (SKKU)  Seobu\u2010ro, Jangan\u2010gu Suwon Gyeonggi\u2010do 440\u2010746 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongfeng","family":"Mei","sequence":"additional","affiliation":[{"name":"Department of Materials Science Fudan University  220 Handan Road Shanghai 200433 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changhyun","family":"Pang","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering SKKU Advanced Institute of Nanotechnology (SAINT) Samsung Advanced Institute for Health Science &amp; Technology (SAIHST) Sungkyunkwan University (SKKU)  Seobu\u2010ro, Jangan\u2010gu Suwon Gyeonggi\u2010do 440\u2010746 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Taeyoon","family":"Lee","sequence":"additional","affiliation":[{"name":"School of Electrical and Electronic Engineering Yonsei University  50 Yonsei\u2010ro Seodaemun\u2010gu Seoul 03722 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2017,6,30]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201503215"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201401718"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/nnano.2011.12"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.3389\/fnbot.2012.00008"},{"key":"e_1_2_7_5_1","volume-title":"2013 IEEE Inter. 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