In-Situ Shear Exfoliation of Graphene From Graphite Polymer Nanocomposites for Lung and Heart Motion
Document Type
Conference Proceeding
Publication Date
2-5-2024
Abstract
Graphene-based nanocomposites have become attractive for different applications such as energy storage, sensors, biomolecule detection, biomedical, healthcare, and wearable devices due to their unique mechanical, electrical, and thermal properties. However, using commercial graphene for making nanocomposite devices can be expensive, and fabricating nanocomposites can be challenging due to impurities while transferring graphene to elastomer composites. In this study, we used a simple, inexpensive in-situ shear exfoliation method to produce graphene from graphite directly within the elastomer. As the graphene in the elastomer reached beyond its percolation or threshold, electrons hop or tunnel around from one graphene flake to another. So, the as-prepared nanodevices are piezoresistive in nature, and the resistance changes whenever there is a change in distance between graphene flakes. The abovementioned devices were able to detect podiatric pressure, heart, and lung motion (left and right rectus abdominis). The nanocomposite strain possesses high sensitivity, a conductivity of ∼20 S/m (measured by ASTM D4496 - Standard Test Method For D-C Resistance or Conductance of Moderately Conductive Materials), excellent stretchability, and ultra-sensitivity (heart rate was measured 100 BPM). Thus, these graphene-enhanced elastomeric composite (referred to as G-EMC) devices can be an excellent platform for healthcare applications like heart and lung motion detection.
Recommended Citation
Rahman, MA, Salam, MARBA, & Ashraf, A. "In-Situ Shear Exfoliation of Graphene From Graphite Polymer Nanocomposites for Lung and Heart Motion." Proceedings of the ASME 2023 International Mechanical Engineering Congress and Exposition. Volume 12: Micro- and Nano-Systems Engineering and Packaging. New Orleans, Louisiana, USA. October 29–November 2, 2023. V012T13A013. ASME. https://doi.org/10.1115/IMECE2023-113676
Publication Title
Proceedings of the ASME 2023 International Mechanical Engineering Congress and Exposition
DOI
10.1115/IMECE2023-113676
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