Healable capacitive touch screen sensors based on transparent composite electrodes comprising silver nanowires and a furan/maleimide diels-Alder cycloaddition polymer

Junpeng Li, Jiajie Liang, Lu Li, Fengbo Ren, Wei Hu, Juan Li, Shuhua Qi, Qibing Pei

Research output: Contribution to journalArticle

100 Scopus citations

Abstract

A healable transparent capacitive touch screen sensor has been fabricated based on a healable silver nanowire-polymer composite electrode. The composite electrode features a layer of silver nanowire percolation network embedded into the surface layer of a polymer substrate comprising an ultrathin soldering polymer layer to confine the nanowires to the surface of a healable Diels-Alder cycloaddition copolymer and to attain low contact resistance between the nanowires. The composite electrode has a figure-of-merit sheet resistance of 18 ω/sq with 80% transmittance at 550 nm. A surface crack cut on the conductive surface with 18 ω is healed by heating at 100 °C, and the sheet resistance recovers to 21 ω in 6 min. A healable touch screen sensor with an array of 8 × 8 capacitive sensing points is prepared by stacking two composite films patterned with 8 rows and 8 columns of coupling electrodes at 90° angle. After deliberate damage, the coupling electrodes recover touch sensing function upon heating at 80 °C for 30 s. A capacitive touch screen based on Arduino is demonstrated capable of performing quick recovery from malfunction caused by a razor blade cutting. After four cycles of cutting and healing, the sensor array remains functional.

Original languageEnglish (US)
Pages (from-to)12874-12882
Number of pages9
JournalACS nano
Volume8
Issue number12
DOIs
StatePublished - Dec 23 2014
Externally publishedYes

Keywords

  • capacitive touch sensor
  • self-healing
  • silver nanowire
  • transparent composite electrode

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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