Heterogeneous Configuration of a Ag Nanowire/Polymer Composite Structure for Selectively Stretchable Transparent Electrodes

Youngmin Kim, Sungwoo Jun, Byeong Kwon Ju, Jong Woong Kim

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

One of the most important aspects that we need to consider in the design of intrinsically stretchable electrodes is that most electronic devices that can be formed on them are not stretchable themselves. This discrepancy can induce severe stress singularities at the interfaces between stiff devices and stretchable electrodes, leading to catastrophic device delamination when the substrate is stretched. Here, we suggest a novel solution to this challenge which involves introducing a photolithography-based rigid-island approach to fabricate the heterogeneous configuration of a silver nanowire (AgNW)/polymer composite structure. For this, we designed two new transparent polymers: a photopatternable polymer that is rigid yet flexible, and a stretchable polymer, both of which have identical acrylate functional groups. Patterning of the rigid polymer and subsequent overcoating of the soft polymer formed rigid island disks embedded in the soft polymer, resulting in a selectively stretchable transparent film. Strong covalent bonds instead of weak physical interactions between the polymers strengthened the cohesive force at the interface of the rigid/soft polymers. Inverted-layer processing with a percolated AgNW network was used to form a heterogeneous AgNW/polymer composite structure that can be used as a selectively stretchable transparent electrode. An optimized structural configuration prevented the resistance of the rigid electrode from varying up to a lateral strain of 70%. A repeated stretch/release test with 60% strain for 5000 cycles did not cause any severe damage to the structure, revealing that the fabricated structure was mechanically stable and reliable.

Original languageEnglish
Pages (from-to)7505-7514
Number of pages10
JournalACS Applied Materials and Interfaces
Volume9
Issue number8
DOIs
Publication statusPublished - 2017 Mar 1

Bibliographical note

Funding Information:
This work was supported by the Ministry of Trade, Industry and Energy (MOTIE)/the Korea Institute of Energy Technology Evaluation and Planning (KETEP) of the Republic of Korea (Grant 20153010140030 and 20155020301000). Support was also provided by the MOTIE/Korea Evaluation Institute of Industrial Technology (KEIT) (Grant 10051080), and the Ministry of Science, ICT and Future Planning/the National Research Foundation of Korea (NRF) of the Republic of Korea (Grant 2016M3A7B4910).

Publisher Copyright:
© 2017 American Chemical Society.

Keywords

  • Ag nanowire
  • heterogeneous composite structure
  • rigid island
  • stretchable electronics
  • transparent electrode

ASJC Scopus subject areas

  • General Materials Science

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