期刊
SMALL
卷 16, 期 13, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201906845
关键词
air-suspended nanowires; aligned nanowires; energy stringent sensors; nanolenes; structural engineering; ultralong nanowires
类别
资金
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) [NRF-2017R1A2B3005221]
- Open Innovation Lab Cooperation Project - National NanoFab Center (NNFC) [PCOI1804M002]
Air suspension and alignment are fundamental requirements to make the best use of nanowires' unique properties; however, satisfying both requirements is very challenging due to the mechanical instability of air-suspended nanowires. Here, a perfectly aligned air-suspended nanowire array called nanolene is demonstrated, which has a high mechanical stability owing to a C-channel-shaped cross-section of the nanowires. The excellent mechanical stability is provided through geometrical modeling and finite element method simulations. The C-channel cross-section can be realized by top-down fabrication procedures, resulting in reliable demonstrations of the nanolenes with various materials and geometric parameters. The fabrication process provides large-area uniformity; therefore, nanolene can be considered as a 2D planar platform for 1D nanowire arrays. Thanks to the high mechanical stability of the proposed nanolene, perfectly aligned air-suspended nanowire arrays with an unprecedented length of 1 mm (aspect ratio approximate to 5100) are demonstrated. Since the nanolene can be used in an energy-efficient nanoheater, two energy-stringent sensors, namely, an air-flow sensor and a carbon monoxide gas sensor, are demonstrated. In particular, the gas sensor achieves sub-10 mW operations, which is a requirement for application in mobile phones. The proposed nanolene will pave the way to accelerate nanowire research and industrialization by providing reliable, high-performance nanowire devices.
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