Multiaxial and Transparent Strain Sensors Based on Synergetically Reinforced and Orthogonally Cracked Hetero-Nanocrystal Solids
- Authors
- Lee, Woo Seok; Kim, Donggyu; Park, Byeonghak; Joh, Hyungmok; Woo, Ho Kun; Hong, Yun-Kun; Kim, Tae-il; Ha, Don-Hyung; Oh, Soong Ju
- Issue Date
- 24-1월-2019
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- hetero-nanocrystals; multiaxial strain sensors; orthogonal cracks; Poisson effect; transparent electronics
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.29, no.4
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 29
- Number
- 4
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/68252
- DOI
- 10.1002/adfm.201806714
- ISSN
- 1616-301X
- 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.
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