Multiaxial and Transparent Strain Sensors Based on Synergetically Reinforced and Orthogonally Cracked Hetero-Nanocrystal Solids

Woo Seok Lee, Donggyu Kim, Byeonghak Park, Hyungmok Joh, Ho Kun Woo, Yun Kun Hong, Tae il Kim, Don Hyung Ha, Soong Ju Oh

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Wearable strain sensors are widely researched as core components in electronic skin. However, their limited capability of detecting only a single axial strain, and their low sensitivity, stability, opacity, and high production costs hinder their use in advanced applications. Herein, multiaxially highly sensitive, optically transparent, chemically stable, and solution-processed strain sensors are demonstrated. Transparent indium tin oxide and zinc oxide nanocrystals serve as metallic and insulating components in a metal–insulator matrix and as active materials for strain gauges. Synergetic sensitivity- and stability-reinforcing agents are developed using a transparent SU-8 polymer to enhance the sensitivity and encapsulate the devices, elevating the gauge factor up to over 3000 by blocking the reconnection of cracks caused by the Poisson effect. Cross-shaped patterns with an orthogonal crack strategy are developed to detect a complex multiaxial strain, efficiently distinguishing strains applied in various directions with high sensitivity and selectivity. Finally, all-transparent wearable strain sensors with Ag nanowire electrodes are fabricated using an all-solution process, which effectively measure not only the human motion or emotion, but also the multiaxial strains occurring during human motion in real time. The strategies can provide a pathway to realize cost-effective and high-performance wearable sensors for advanced applications such as bio-integrated devices.

Original languageEnglish
Article number1806714
JournalAdvanced Functional Materials
Volume29
Issue number4
DOIs
Publication statusPublished - 2019 Jan 24

Fingerprint

Nanocrystals
nanocrystals
sensitivity
sensors
Sensors
cracks
emotions
production costs
axial strain
strain gages
opacity
zinc oxides
indium oxides
tin oxides
nanowires
Cracks
Zinc Oxide
selectivity
costs
Opacity

Keywords

  • hetero-nanocrystals
  • multiaxial strain sensors
  • orthogonal cracks
  • Poisson effect
  • transparent electronics

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Multiaxial and Transparent Strain Sensors Based on Synergetically Reinforced and Orthogonally Cracked Hetero-Nanocrystal Solids. / Lee, Woo Seok; Kim, Donggyu; Park, Byeonghak; Joh, Hyungmok; Woo, Ho Kun; Hong, Yun Kun; Kim, Tae il; Ha, Don Hyung; Oh, Soong Ju.

In: Advanced Functional Materials, Vol. 29, No. 4, 1806714, 24.01.2019.

Research output: Contribution to journalArticle

Lee, Woo Seok ; Kim, Donggyu ; Park, Byeonghak ; Joh, Hyungmok ; Woo, Ho Kun ; Hong, Yun Kun ; Kim, Tae il ; Ha, Don Hyung ; Oh, Soong Ju. / Multiaxial and Transparent Strain Sensors Based on Synergetically Reinforced and Orthogonally Cracked Hetero-Nanocrystal Solids. In: Advanced Functional Materials. 2019 ; Vol. 29, No. 4.
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