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Facile Fabrication of “Tacky”, Stretchable, and Aligned Carbon Nanotube Sheet-Based Electronics for On-Skin Health Monitoring
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    Functional Nanostructured Materials (including low-D carbon)

    Facile Fabrication of “Tacky”, Stretchable, and Aligned Carbon Nanotube Sheet-Based Electronics for On-Skin Health Monitoring
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    • Duy Van Nguyen*
      Duy Van Nguyen
      School of Engineering, University of Southern Queensland, Brisbane 4300, Queensland, Australia
      Centre for Future Materials, University of Southern Queensland, Brisbane 4300, Queensland, Australia
      *Email: [email protected]
    • Dean Mills
      Dean Mills
      School of Health and Medical Sciences, University of Southern Queensland, Brisbane 4305, Queensland, Australia
      More by Dean Mills
    • Canh-Dung Tran
      Canh-Dung Tran
      School of Engineering, University of Southern Queensland, Brisbane 4300, Queensland, Australia
    • Thanh Nguyen
      Thanh Nguyen
      School of Engineering, University of Southern Queensland, Brisbane 4300, Queensland, Australia
      Centre for Future Materials, University of Southern Queensland, Brisbane 4300, Queensland, Australia
      More by Thanh Nguyen
    • Hung Nguyen
      Hung Nguyen
      School of Engineering, University of Southern Queensland, Brisbane 4300, Queensland, Australia
      Centre for Future Materials, University of Southern Queensland, Brisbane 4300, Queensland, Australia
      More by Hung Nguyen
    • Thi Lap Tran
      Thi Lap Tran
      School of Engineering, University of Southern Queensland, Brisbane 4300, Queensland, Australia
      Centre for Future Materials, University of Southern Queensland, Brisbane 4300, Queensland, Australia
      More by Thi Lap Tran
    • Pingan Song
      Pingan Song
      Centre for Future Materials, University of Southern Queensland, Brisbane 4300, Queensland, Australia
      More by Pingan Song
    • Hoang-Phuong Phan
      Hoang-Phuong Phan
      School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney 1466, New South Wales, Australia
    • Nam-Trung Nguyen
      Nam-Trung Nguyen
      Queensland Micro- and Nanotechnology Centre, Griffith University, Brisbane 4111, Queensland, Australia
    • Dzung Viet Dao
      Dzung Viet Dao
      Queensland Micro- and Nanotechnology Centre, Griffith University, Brisbane 4111, Queensland, Australia
      Griffith School of Engineering, Griffith University, Gold Coast 4125, Queensland, Australia
    • John Bell
      John Bell
      Centre for Future Materials, University of Southern Queensland, Brisbane 4300, Queensland, Australia
      More by John Bell
    • Toan Dinh*
      Toan Dinh
      School of Engineering, University of Southern Queensland, Brisbane 4300, Queensland, Australia
      Centre for Future Materials, University of Southern Queensland, Brisbane 4300, Queensland, Australia
      *Email: [email protected]
      More by Toan Dinh
    Other Access OptionsSupporting Information (6)

    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2023, 15, 50, 58746–58760
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsami.3c13541
    Published December 5, 2023
    Copyright © 2023 American Chemical Society

    Abstract

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    Point-of-care monitoring of physiological signals such as electrocardiogram, electromyogram, and electroencephalogram is essential for prompt disease diagnosis and quick treatment, which can be realized through advanced skin-worn electronics. However, it is still challenging to design an intimate and nonrestrictive skin-contact device for physiological measurements with high fidelity and artifact tolerance. This research presents a facile method using a “tacky” surface to produce a tight interface between the ACNT skin-like electronic and the skin. The method provides the skin-worn electronic with a stretchability of up to 70% strain, greater than that of most common epidermal electrodes. Low-density ACNT bundles facilitate the infiltration of adhesive and improve the conformal contact between the ACNT sheet and the skin, while dense ACNT bundles lessen this effect. The stretchability and conformal contact allow the ACNT sheet-based electronics to create a tight interface with the skin, which enables the high-fidelity measurement of physiological signals (the Pearson’s coefficient of 0.98) and tolerance for motion artifacts. In addition, our method allows the use of degradable substrates to enable reusability and degradability of the electronics based on ACNT sheets, integrating “green” properties into on-skin electronics.

    Copyright © 2023 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsami.3c13541.

    • Explanation of the electrical robustness of ACNT sheets under deformations; illustration of the fabrication process; photos of damaged ACNT sheets after being transferred from copper or aluminum films; photos of the fragility of ACNT sheets; AFM images of a 1-layer ACNT sheet; photos of deformed ACNT sheets with the skin; electrical stability of ACNT sheets under deformations; photos of prestrained ACNT sheets and their electrical responses to stretching; peeling force test; locations of placing ACNT sheets to examine contact impedance and to monitor ECG, EMG, and EEG; HRs during rest and exercise; root-mean-square values of EMG signals; EEG signals obtained using commercial electrodes; photos of reused ACNT sheets transferred from a PVA substrate to a PDMS substrate; photos and electrical responses of the reused ACNT sheets during stretching and bending; photos of degrading ACNT sheets under heating and stirring conditions; and comparison with previous work (PDF)

    • Movie S1 and drawing ACNT sheets from a CNT forest (MOV)

    • Movie S2 and fragility test of an ACNT sheet on either a nonadhesive substrate or an adhesive substrate (MOV)

    • Movie S3 and deformation test of ACNT sheets (MOV)

    • Movie S4 and stretching prestrained and nonprestrained ACNT sheets to change a LED state (MOV)

    • Movie S5 and shifting ACNT sheets from PVA substrates to PDMS substrates for reusability (MOV)

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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2023, 15, 50, 58746–58760
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsami.3c13541
    Published December 5, 2023
    Copyright © 2023 American Chemical Society

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