A Nature-Inspired, Flexible Substrate Strategy for Future Wearable Electronics

Zhu, Chuang, Chalmers, Evelyn, Chen, Liming, Wang, Yuqi, Xu, Bin, Li, Yi and Lui, Xuqing (2019) A Nature-Inspired, Flexible Substrate Strategy for Future Wearable Electronics. Small, 15 (35). p. 1902440. ISSN 1613-6810

Zhu et al - A Nature Inspired, Flexible Substrate Strategy for Future Wearable Electronics AAM.pdf - Accepted Version

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Official URL: https://doi.org/10.1002/smll.201902440


Flexibility plays a vital role in wearable electronics. Repeated bending often leads to the dramatic decrease of conductivity because of the numerous microcracks formed in the metal coating layer, which is undesirable for flexible conductors. Herein, conductive textile‐based tactile sensors and metal‐coated polyurethane sponge‐based bending sensors with superior flexibility for monitoring human touch and arm motions are proposed, respectively. Tannic acid, a traditional mordant, is introduced to attach to various flexible substrates, providing a perfect platform for catalyst absorbing and subsequent electroless deposition (ELD). By understanding the nucleation, growth, and structure of electroless metal deposits, the surface morphology of metal nanoparticles can be controlled in nanoscale with simple variation of the plating time. When the electroless plating time is 20 min, the normalized resistance (R/R0) of as‐made conductive fibers is only 1.6, which is much lower than a 60 min ELD sample at the same conditions (R/R0 ≈ 5). This is because a large number of unfilled gaps between nanoparticles prevent metal films from cracking under bending. Importantly, the Kelvin problem is relevant to deposited conductive coatings because metallic cells have a honeycomb‐like structure, which is a rationale to explain the relationships of conductivity and flexibility.

Item Type: Article
Uncontrolled Keywords: flexibility, bending sensors, tannic acid, fibers, Kelvin question
Subjects: H600 Electronic and Electrical Engineering
J500 Materials Technology not otherwise specified
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Paul Burns
Date Deposited: 06 Jun 2019 15:54
Last Modified: 31 Jul 2021 11:31
URI: http://nrl.northumbria.ac.uk/id/eprint/39552

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