Bioinspired Geometry-Switchable Janus Nanofibers for Eye-Readable H2 Sensors

Title
Bioinspired Geometry-Switchable Janus Nanofibers for Eye-Readable H2 Sensors
Authors
서정목한희탁백상렬Borui Xu이상근신세라이재홍구자훈Yongfeng Mei방창현이태윤
Issue Date
2017-08
Publisher
Advanced functional materials
Citation
VOL 27, NO 29-1701618-8
Abstract
Nanoscale architectures found in nature have unique functionalities and their discovery has led to significant advancements in various fields including optics, wetting, and adhesion. 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-switchable and highly H2-reactive Janus nanofiber (H-NF) array inspired by the structural features of the arthropod sensilla. The H-NF array (400 nm diameter, 4 µ m height, 1.2 µ m spacing distance, and hexagonal array) exhibits reversible structural deformation when exposed to a flammable concentration of hydrogen gas (4 vol% H2 in N2) 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-NF array. Based on these results, an eye-readable H2-sensor that requires no additional electrical apparatus is demonstrated, including wetting-controllable H2-selective smart surfaces and H2-responsive fasteners.
URI
http://pubs.kist.re.kr/handle/201004/66039
ISSN
1616-301X
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KIST Publication > Article
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