Haze-free transparent electrodes using metal nanofibers with carbon shells for high-temperature stability

Sangyoon Ji, Jihun Park, Yejin Jo, Young Bin Kim, Jiuk Jang, Sun Kyung Kim, Sunho Jeong, Jang Ung Park

Research output: Contribution to journalArticle

Abstract

One of the key strategies for developing modern transparent optoelectronic devices is to achieve more conductive, transparent, and thermally-stable electrodes at minimal costs. Herein, we report a simple and cost-effective coaxial electrospinning process that produces continuous and ultra-long copper nanofibers (CuNFs) conformally covered with a shell layer of carbon black (CB). The electrospinning of Cu nanoparticles and CB inks enabled the fabrication of Cu (core)/CB (shell) nanofibers as network forms that were dispersed directly on target substrates with no additional deposition or lithography process. By virtue of the presence of the CB shell, the reflection of light from the metal surface, a critical limitation in existing metallic transparent conductive electrodes (TCEs), was reduced dramatically. Its reflection of light was even lower than that of bare quartz due to the suppressed backscattering of individual CuNFs, and this provided a high-clarity view through the black CuNF-TCEs while maintaining the high transparency of 91% and the low sheet resistance of 0.8 Ω/sq. Current-voltage experiments on single NF showed that a CuNF sustained a breakdown current density of 5 × 10 6 A/cm 2 , outperforming its counterpart silver NF and indicating the robustness of black CuNF-TCEs against electromigration. Such haze-free, thermally-stable black CuNF-TCEs enabled the demonstration of transparent heaters capable of working at extremely high temperatures; the maximum working temperature of the heaters was up to 800 °C, and the temperature was maintained for >90 min under an alternating current bias. We believe that the coaxial electrospinning of metal inks with other products will enable a variety of multi-functional metal NFs, leading to the development of next-generation displays, touch panels, and smart windows.

Original languageEnglish
Pages (from-to)1101-1109
Number of pages9
JournalApplied Surface Science
Volume483
DOIs
Publication statusPublished - 2019 Jul 31

Fingerprint

haze
Nanofibers
Carbon
Soot
Metals
Copper
copper
Electrodes
electrodes
Carbon black
carbon
metals
Electrospinning
inks
heaters
Temperature
Ink
Light Metals
costs
clarity

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

Ji, Sangyoon ; Park, Jihun ; Jo, Yejin ; Kim, Young Bin ; Jang, Jiuk ; Kim, Sun Kyung ; Jeong, Sunho ; Park, Jang Ung. / Haze-free transparent electrodes using metal nanofibers with carbon shells for high-temperature stability. In: Applied Surface Science. 2019 ; Vol. 483. pp. 1101-1109.
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abstract = "One of the key strategies for developing modern transparent optoelectronic devices is to achieve more conductive, transparent, and thermally-stable electrodes at minimal costs. Herein, we report a simple and cost-effective coaxial electrospinning process that produces continuous and ultra-long copper nanofibers (CuNFs) conformally covered with a shell layer of carbon black (CB). The electrospinning of Cu nanoparticles and CB inks enabled the fabrication of Cu (core)/CB (shell) nanofibers as network forms that were dispersed directly on target substrates with no additional deposition or lithography process. By virtue of the presence of the CB shell, the reflection of light from the metal surface, a critical limitation in existing metallic transparent conductive electrodes (TCEs), was reduced dramatically. Its reflection of light was even lower than that of bare quartz due to the suppressed backscattering of individual CuNFs, and this provided a high-clarity view through the black CuNF-TCEs while maintaining the high transparency of 91{\%} and the low sheet resistance of 0.8 Ω/sq. Current-voltage experiments on single NF showed that a CuNF sustained a breakdown current density of 5 × 10 6 A/cm 2 , outperforming its counterpart silver NF and indicating the robustness of black CuNF-TCEs against electromigration. Such haze-free, thermally-stable black CuNF-TCEs enabled the demonstration of transparent heaters capable of working at extremely high temperatures; the maximum working temperature of the heaters was up to 800 °C, and the temperature was maintained for >90 min under an alternating current bias. We believe that the coaxial electrospinning of metal inks with other products will enable a variety of multi-functional metal NFs, leading to the development of next-generation displays, touch panels, and smart windows.",
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Haze-free transparent electrodes using metal nanofibers with carbon shells for high-temperature stability. / Ji, Sangyoon; Park, Jihun; Jo, Yejin; Kim, Young Bin; Jang, Jiuk; Kim, Sun Kyung; Jeong, Sunho; Park, Jang Ung.

In: Applied Surface Science, Vol. 483, 31.07.2019, p. 1101-1109.

Research output: Contribution to journalArticle

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