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Nanomaterials 2018, 8(10), 767; https://doi.org/10.3390/nano8100767

Aqueous Synthesis, Degradation, and Encapsulation of Copper Nanowires for Transparent Electrodes

1
Chair of Nanoelectronics, Technical University of Munich, 80333 Munich, Germany
2
Faculty of Science and Technology, Free University of Bolzano, 39100 Bolzano-Bozen, Italy
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 17 August 2018 / Revised: 12 September 2018 / Accepted: 25 September 2018 / Published: 28 September 2018
(This article belongs to the Special Issue Synthesis and Modification of Nanostructured Thin Films)
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Abstract

Copper nanowires (CuNWs) have increasingly become subjected to academic and industrial research, which is attributed to their good performance as a transparent electrode (TE) material that competes with the one of indium tin oxide (ITO). Recently, an environmentally friendly and aqueous synthesis of CuNWs was demonstrated, without the use of hydrazine that is known for its unfavorable properties. In this work, we extend the current knowledge for the aqueous synthesis of CuNWs by studying their up-scaling potential. This potential is an important aspect for the commercialization and further development of CuNW-based devices. Due to the scalability and homogeneity of the deposition process, spray coating was selected to produce films with a low sheet resistance of 7.6 Ω/sq. and an optical transmittance of 77%, at a wavelength of 550 nm. Further, we present a comprehensive investigation of the degradation of CuNWs when subjected to different environmental stresses such as the exposure to ambient air, elevated temperatures, high electrical currents, moisture or ultraviolet (UV) light. For the oxidation process, a model is derived to describe the dependence of the breakdown time with the temperature and the initial resistance. Finally, polymer coatings made of polydimethylsiloxane (PDMS) and polymethylmethacrylate (PMMA), as well as oxide coatings composed of electron beam evaporated silicon dioxide (SiO2) and aluminum oxide (Al2O3) are tested to hinder the oxidation of the CuNW films under current flow. View Full-Text
Keywords: copper nanowires; CuNWs; degradation; encapsulation; PDMS; PMMA; solution-based; transparent electrode copper nanowires; CuNWs; degradation; encapsulation; PDMS; PMMA; solution-based; transparent electrode
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Mock, J.; Bobinger, M.; Bogner, C.; Lugli, P.; Becherer, M. Aqueous Synthesis, Degradation, and Encapsulation of Copper Nanowires for Transparent Electrodes. Nanomaterials 2018, 8, 767.

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