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  Low temperature solid-state wetting and formation of nanowelds in silver nanowires

Radmilovic, V. V., Goebelt, M., Ophus, C., Christiansen, S., Spiecker, E., & Radmilovic, V. R. (2017). Low temperature solid-state wetting and formation of nanowelds in silver nanowires. NANOTECHNOLOGY, 28(38): 385701. doi:10.1088/1361-6528/aa7eb8.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-8873-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-8874-4
Genre: Journal Article

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 Creators:
Radmilovic, Vuk V.1, Author
Goebelt, Manuela2, Author              
Ophus, Colin1, Author
Christiansen, Silke2, 3, 4, Author              
Spiecker, Erdmann1, Author
Radmilovic, Velimir R.1, Author
Affiliations:
1external, ou_persistent22              
2Christiansen Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society, ou_2364716              
3Helmoltz-Center Berlin for Materials & Energy (HZB), Hahn Meitner Pl 1, D-14109 Berlin, Germany, ou_persistent22              
4Free University of Berlin, Phys Dept, Arnimallee 14, D-14195 Berlin, Germany, ou_persistent22              

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Free keywords: TRANSPARENT CONDUCTIVE FILMS; ULTRATHIN GOLD NANOWIRES; ATOMIC LAYER DEPOSITION; DOPED ZNO FILMS; MECHANICAL-PROPERTIES; RAYLEIGH INSTABILITY; ROOM-TEMPERATURE; AG NANOWIRES; SOLAR-CELLS; ELECTRODESScience & Technology - Other Topics; Materials Science; Physics; silver nanowires (AgNWs); aluminum-doped zinc oxide (AZO); nanoweld formation; solid-state wetting; nanowire sintering;
 Abstract: This article focuses on the microscopic mechanism of thermally induced nanoweld formation between silver nanowires (AgNWs) which is a key process for improving electrical conductivity in NW networks employed for transparent electrodes. Focused ion beam sectioning and transmission electron microscopy were applied in order to elucidate the atomic structure of a welded NW including measurement of the wetting contact angle and characterization of defect structure with atomic accuracy, which provides fundamental information on the welding mechanism. Crystal lattice strain, obtained by direct evaluation of atomic column displacements in high resolution scanning transmission electron microscopy images, was shown to be non-uniform among the five twin segments of the AgNW pentagonal structure. It was found that the pentagonal cross-sectional morphology of AgNWs has a dominant effect on the formation of nanowelds by controlling initial wetting as well as diffusion of Ag atoms between the NWs. Due to complete solid-state wetting, at an angle of similar to 4.8 degrees, the welding process starts with homoepitaxial nucleation of an initial Ag layer on (100) surface facets, considered to have an infinitely large radius of curvature. However, the strong driving force for this process due to the Gibbs-Thomson effect, requires the NW contact to occur through the corner of the pentagonal cross-section of the second NW providing a small radius of curvature. After the initial layer is formed, the welded zone continues to grow and extends out epitaxially to the neighboring twin segments.

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Language(s): eng - English
 Dates: 2017
 Publication Status: Published online
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000413181300001
DOI: 10.1088/1361-6528/aa7eb8
 Degree: -

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Title: NANOTECHNOLOGY
Source Genre: Journal
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Publ. Info: TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND : IOP PUBLISHING LTD
Pages: - Volume / Issue: 28 (38) Sequence Number: 385701 Start / End Page: - Identifier: ISSN: 0957-4484