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Templated self-assembly of ultrathin gold nanowires by nanoimprinting for transparent flexible electronics

  • We fabricated flexible, transparent, and conductive metal grids as transparent conductive materials (TCM) with adjustable properties by direct nanoimprinting of self-assembling colloidal metal nanowires. Ultrathin gold nanowires (diameter below 2 nm) with high mechanical flexibility were confined in a stamp and readily adapted to its features. During drying, the wires self-assembled into dense bundles that percolated throughout the stamp. The high aspect ratio and the bundling yielded continuous, hierarchical superstructures that connected the entire mesh even at low gold contents. A soft sintering step removed the ligand barriers but retained the imprinted structure. The material exhibited high conductivities (sheet resistances down to 29 Ω/sq) and transparencies that could be tuned by changing wire concentration and stamp geometry. We obtained TCMs that are suitable for applications such as touch screens. Mechanical bending tests showed a much higher bending resistance than commercial ITO: conductivity dropped by only 5.6% after 450 bending cycles at a bending radius of 5 mm.

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Document Type:Article
Author:Johannes H. M. Maurer, Lola González-GarcíaORCiD, Beate Reiser, Ioannis Kanelidis, Tobias KrausORCiD
Parent Title (English):Nano letters
First Page:2921
Last Page:2925
Year of first Publication:2016
Release Date:2022/09/24
Tag:Flexible electronics; Metal grids; Nanoimprint; Transparent conductive electrodes; Ultrathin gold nanowires
Impact:12.712 (2016)
Funding Information:German Federal Ministry of Education and Research in the “NanoMatFutur” program
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 660 Technische Chemie
Open Access:Open Access
Signature:INM 2016/045
Licence (German):License LogoUrheberrechtlich geschützt