Roll-to-roll redox-welding and embedding for silver nanowire network electrodes

Yeontae Kim, Yeong Eun Sul, Hyungseok Kang, Yongsuk Choi, Ho Sun Lim, Sungjoo Lee, Lyongsun Pu, Gi Ra Yi, Sung Min Cho, Jeong Ho Cho

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We developed a continuous roll-to-roll redox-welding and embedding method for the fabrication of electrodes of silver nanowire (AgNWs) networks. The roll-to-roll welding method involved a sequence of oxidation and reduction reactions in an aqueous solution. The redox-welding significantly decreased the sheet resistance of the AgNW film owing to the strong fusion and interlocking at the nanowire junction, while the optical transmittance was maintained. The first oxidation step using HNO3 generated ionized silver (Ag+) which got re-deposited onto the nanowire junctions via an autocatalytic reaction. The oxide layers, which formed on the nanowire surface by both air exposure and the first step of oxidation, were removed by the second reduction step using NaBH4. The redox-welded AgNW electrodes exhibited a sheet resistance of 11.3 Ω sq-1 at the optical transmittance of 90.5% at 550 nm. Furthermore, redox-welding of the AgNWs significantly enhanced their mechanical robustness compared to that of the as-coated AgNWs. The redox-welded AgNWs embedded in a UV curable resin, using a roll-to-roll embedding process, were successfully applied as anode electrodes for large-area and flexible organic light emitting diodes (OLEDs). The device performance is superior to that of a device based on the as-coated AgNW electrode, and is also comparable to that of a device using commercial ITO as the electrode. The redox-welding and embedding processes provide a facile and reliable method for fabricating large-area transparent flexible electrodes for next-generation flexible optoelectronic devices.

Original languageEnglish
Pages (from-to)18627-18634
Number of pages8
JournalNanoscale
Volume10
Issue number39
DOIs
Publication statusPublished - 2018 Oct 21

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Silver
Nanowires
Welding
Electrodes
Sheet resistance
Opacity
Oxidation
Organic light emitting diodes (OLED)
Optoelectronic devices
Oxides
Oxidation-Reduction
Anodes
Fusion reactions
Resins
Fabrication
Air

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Kim, Y., Sul, Y. E., Kang, H., Choi, Y., Lim, H. S., Lee, S., ... Cho, J. H. (2018). Roll-to-roll redox-welding and embedding for silver nanowire network electrodes. Nanoscale, 10(39), 18627-18634. https://doi.org/10.1039/c8nr01040d
Kim, Yeontae ; Sul, Yeong Eun ; Kang, Hyungseok ; Choi, Yongsuk ; Lim, Ho Sun ; Lee, Sungjoo ; Pu, Lyongsun ; Yi, Gi Ra ; Cho, Sung Min ; Cho, Jeong Ho. / Roll-to-roll redox-welding and embedding for silver nanowire network electrodes. In: Nanoscale. 2018 ; Vol. 10, No. 39. pp. 18627-18634.
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abstract = "We developed a continuous roll-to-roll redox-welding and embedding method for the fabrication of electrodes of silver nanowire (AgNWs) networks. The roll-to-roll welding method involved a sequence of oxidation and reduction reactions in an aqueous solution. The redox-welding significantly decreased the sheet resistance of the AgNW film owing to the strong fusion and interlocking at the nanowire junction, while the optical transmittance was maintained. The first oxidation step using HNO3 generated ionized silver (Ag+) which got re-deposited onto the nanowire junctions via an autocatalytic reaction. The oxide layers, which formed on the nanowire surface by both air exposure and the first step of oxidation, were removed by the second reduction step using NaBH4. The redox-welded AgNW electrodes exhibited a sheet resistance of 11.3 Ω sq-1 at the optical transmittance of 90.5{\%} at 550 nm. Furthermore, redox-welding of the AgNWs significantly enhanced their mechanical robustness compared to that of the as-coated AgNWs. The redox-welded AgNWs embedded in a UV curable resin, using a roll-to-roll embedding process, were successfully applied as anode electrodes for large-area and flexible organic light emitting diodes (OLEDs). The device performance is superior to that of a device based on the as-coated AgNW electrode, and is also comparable to that of a device using commercial ITO as the electrode. The redox-welding and embedding processes provide a facile and reliable method for fabricating large-area transparent flexible electrodes for next-generation flexible optoelectronic devices.",
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Kim, Y, Sul, YE, Kang, H, Choi, Y, Lim, HS, Lee, S, Pu, L, Yi, GR, Cho, SM & Cho, JH 2018, 'Roll-to-roll redox-welding and embedding for silver nanowire network electrodes', Nanoscale, vol. 10, no. 39, pp. 18627-18634. https://doi.org/10.1039/c8nr01040d

Roll-to-roll redox-welding and embedding for silver nanowire network electrodes. / Kim, Yeontae; Sul, Yeong Eun; Kang, Hyungseok; Choi, Yongsuk; Lim, Ho Sun; Lee, Sungjoo; Pu, Lyongsun; Yi, Gi Ra; Cho, Sung Min; Cho, Jeong Ho.

In: Nanoscale, Vol. 10, No. 39, 21.10.2018, p. 18627-18634.

Research output: Contribution to journalArticle

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T1 - Roll-to-roll redox-welding and embedding for silver nanowire network electrodes

AU - Kim, Yeontae

AU - Sul, Yeong Eun

AU - Kang, Hyungseok

AU - Choi, Yongsuk

AU - Lim, Ho Sun

AU - Lee, Sungjoo

AU - Pu, Lyongsun

AU - Yi, Gi Ra

AU - Cho, Sung Min

AU - Cho, Jeong Ho

PY - 2018/10/21

Y1 - 2018/10/21

N2 - We developed a continuous roll-to-roll redox-welding and embedding method for the fabrication of electrodes of silver nanowire (AgNWs) networks. The roll-to-roll welding method involved a sequence of oxidation and reduction reactions in an aqueous solution. The redox-welding significantly decreased the sheet resistance of the AgNW film owing to the strong fusion and interlocking at the nanowire junction, while the optical transmittance was maintained. The first oxidation step using HNO3 generated ionized silver (Ag+) which got re-deposited onto the nanowire junctions via an autocatalytic reaction. The oxide layers, which formed on the nanowire surface by both air exposure and the first step of oxidation, were removed by the second reduction step using NaBH4. The redox-welded AgNW electrodes exhibited a sheet resistance of 11.3 Ω sq-1 at the optical transmittance of 90.5% at 550 nm. Furthermore, redox-welding of the AgNWs significantly enhanced their mechanical robustness compared to that of the as-coated AgNWs. The redox-welded AgNWs embedded in a UV curable resin, using a roll-to-roll embedding process, were successfully applied as anode electrodes for large-area and flexible organic light emitting diodes (OLEDs). The device performance is superior to that of a device based on the as-coated AgNW electrode, and is also comparable to that of a device using commercial ITO as the electrode. The redox-welding and embedding processes provide a facile and reliable method for fabricating large-area transparent flexible electrodes for next-generation flexible optoelectronic devices.

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Kim Y, Sul YE, Kang H, Choi Y, Lim HS, Lee S et al. Roll-to-roll redox-welding and embedding for silver nanowire network electrodes. Nanoscale. 2018 Oct 21;10(39):18627-18634. https://doi.org/10.1039/c8nr01040d