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Lookup NU author(s): Dr Shayan SeyedinORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2024 The Authors. Small Methods published by Wiley-VCH GmbH. Wearable devices have generally been rigid due to their reliance on silicon-based technologies, while future wearables will utilize flexible components for example transistors within microprocessors to manage data. Two-dimensional (2D) semiconducting flakes have yet to be investigated in fiber transistors but can offer a route toward high-mobility, biocompatible, and flexible fiber-based devices. Here, the electrochemical exfoliation of semiconducting 2D flakes of tungsten diselenide (WSe2) and molybdenum disulfide (MoS2) is shown to achieve homogeneous coatings onto the surface of polyester fibers. The high aspect ratio (>100) of the flake yields aligned and conformal flake-to-flake junctions on polyester fibers enabling transistors with mobilities μ ≈1 cm2 V−1 s−1 and a current on/off ratio, Ion/Ioff ≈102–104. Furthermore, the cytotoxic effects of the MoS2 and WSe2 flakes with human keratinocyte cells are investigated and found to be biocompatible. As an additional step, a unique transistor ‘knot’ architecture is created by leveraging the fiber diameter to establish the length of the transistor channel, facilitating a route to scale down transistor channel dimensions (≈100 µm) and utilize it to make a MoS2 fiber transistor with a human hair that achieves mobilities as high as μ ≈15 cm2 V−1 s−1.
Author(s): Carey T, Maughan J, Doolan L, Caffrey E, Garcia J, Liu S, Kaur H, Ilhan C, Seyedin S, Coleman JN
Publication type: Article
Publication status: Published
Journal: Small Methods
Year: 2024
Pages: ePub ahead of Print
Online publication date: 11/04/2024
Acceptance date: 26/03/2024
Date deposited: 17/04/2024
ISSN (electronic): 2366-9608
Publisher: Wiley-VCH GmbH
URL: https://doi.org/10.1002/smtd.202301654
DOI: 10.1002/smtd.202301654
Data Access Statement: The data that support the findings of this study are available from the corresponding author upon reasonable request.
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