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

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Radmilovic VV, Göbelt M, Ophus C, Christiansen SH, Spiecker E, Radmilovic VR
Zeitschrift: Nanotechnology
Verlag: Institute of Physics Publishing
Jahr der Veröffentlichung: 2017
Band: 28
Heftnummer: 38
ISSN: 1361-6528


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 ∼4.8°, 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.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Spiecker, Erdmann Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)


Zusätzliche Organisationseinheit(en)
Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden
Exzellenz-Cluster Engineering of Advanced Materials
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)


Einrichtungen weiterer Autorinnen und Autoren

Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light
University of Belgrade / Универзитет у Београду


Forschungsbereiche

C Photonic and Optical Materials
Exzellenz-Cluster Engineering of Advanced Materials
A2 Nanoanalysis and Microscopy
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

APA:
Radmilovic, V.V., Göbelt, M., Ophus, C., Christiansen, S.H., Spiecker, E., & Radmilovic, V.R. (2017). Low temperature solid-state wetting and formation of nanowelds in silver nanowires. Nanotechnology, 28(38). https://dx.doi.org/10.1088/1361-6528/aa7eb8

MLA:
Radmilovic, Vuk V., et al. "Low temperature solid-state wetting and formation of nanowelds in silver nanowires." Nanotechnology 28.38 (2017).

BibTeX: 

Zuletzt aktualisiert 2019-29-05 um 08:35