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Realization of Nanolene: A Planar Array of Perfectly Aligned, Air‐Suspended Nanowires
Author(s) -
Lee JaeShin,
Choi KwangWook,
Yoo JaeYoung,
Jo MinSeung,
Yoon JunBo
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201906845
Subject(s) - nanowire , air suspension , fabrication , materials science , planar , nanotechnology , suspension (topology) , planar array , realization (probability) , channel (broadcasting) , aspect ratio (aeronautics) , optoelectronics , mechanical engineering , computer science , telecommunications , engineering , medicine , statistics , alternative medicine , computer graphics (images) , mathematics , pathology , homotopy , axle , pure mathematics
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 ≈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.