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Carbon Nanocomposite Coated Textile-Based Sensor: Sensing Mechanism and Durability

AMIT CHAUDHARI, SAGAR DOSHI, MADISON WEISS, DAE HAN SUNG, ERIK THOSTESON

Abstract


Carbon nanotube (CNT) composite films are deposited onto stretchable knit fabrics using electrophoretic deposition (EPD) and dip-coating techniques, which are industrially scalable processes for producing future wearable sensors. The deposited CNTs create an electrically conductive nanocomposite film on the surface of the fibers. These nanocomposite coated fabrics exhibit piezoresistive properties; under mechanical deformation/stretching, a large change in the electrical resistance is observed. Polyethyleneimine (PEI) functionalized carbon nanotubes deposited using EPD create a uniform, extremely thin porous coating on the fiber. Initial results show ultrahigh sensitivity of the carbon nanotube coated fabric when tested on elbow/knee to detect range of motion. The sensitivity of these sensors is exceptionally high when compared to a typical carbon nanotube-based polymer nanocomposite. The nanocomposite coating does not affect fabric's breathability or flexibility, making the sensor comfortable to wear. Because of these unique properties, tremendous potential exists for their use in functional/smart garments. Changes in electrical resistance for these fabrics are influenced by a combination of electron tunneling between the carbon nanotubes and the microstructure of the fabric. To investigate and characterize the unique sensing mechanism, the nanotube coated knit fabric's electromechanical response is studied at different length scales, from individual yarns to fabric levels. For applications in wearable sensors, the durability of the nanotube coating on the fabric is critical for repeatable and reliable sensing response. Durability testing of the sensing fabric for washing loads was conducted to study the nanotube coating's robustness. CNT coating's adhesion quality is evaluated based on the weight loss in the specimen and loss in electrical conductivity in each wash cycle. This research addresses the potential of these sensors for functional/smart garments by examining the underlying mechanism of the sensor response and the durability of the carbon nanotube coating.


DOI
10.12783/asc36/35854

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References


H. Zhang, X. Tao, T. Yu, and S. Wang, “Conductive knitted fabric as largestrain

gauge under high temperature,†Sensors Actuators, A Phys., vol. 126, no.

, pp. 129–140, 2006.

J. Xie, H. Long, and M. Miao, “High sensitivity knitted fabric strain sensors,â€

Smart Mater. Struct., vol. 25, no. 10, pp. 1–7, 2016.

O. Atalay, W. Richard Kennon, and M. Dawood Husain, “Textile-based weft

knitted strain sensors: Effect of fabric parameters on sensor properties,†Sensors

(Switzerland), vol. 13, no. 8, pp. 11114–11127, 2013.

J. Xie and H. Long, “Equivalent resistance calculation of knitting sensor under

strip biaxial elongation,†Sensors Actuators, A Phys., vol. 220, pp. 118–125,

V. Gaubert, H. Gidik, N. Bodart, and V. Koncar, “Investigating the impact of

washing cycles on silver-plated textile electrodes: A complete study,†Sensors

(Switzerland), vol. 20, no. 6, pp. 1–16, 2020.

G. Paul, R. Torah, K. Yang, S. Beeby, and J. Tudor, “An investigation into the

durability of screen-printed conductive tracks on textiles,†Meas. Sci. Technol.,

vol. 25, no. 2, 2014.

A. Chaudhari, S. M. Doshi, C. Murray, and E. T. Thostenson, “Highly-sensitive

carbon nanotube based sensors using everyday fabrics for human motion

analysis,†Int. SAMPE Tech. Conf., vol. 2019-May, pp. 1–7, 2019.

T. Yamada et al., “A stretchable carbon nanotube strain sensor for humanmotion

detection,†Nat. Nanotechnol., vol. 6, no. 5, pp. 296–301, 2011.

S. Ryu et al., “Extremely Elastic Wearable Carbon Nanotube Fiber Strain

Sensor for Monitoring of Human Motion,†ACS Nano, vol. 9, no. 6, pp. 5929–

, 2015.

A. Chaudhari, A. Jerome, S. M. Doshi, M. Keefe, and E. Thostenson, “Carbon

Nanomaterial Based Multifunctional Fabrics For Characterizing Human Joint

motion,†SAMPE Conference Proceedings, Seattle, WA, May 4-7, 2020.

S. M. Doshi, C. Murray, A. Chaudhari, and E. T. Thostenson, “Carbon

Nanotube Coated Textile Sensors with Ultrahigh Sensitivity for Human Motion

Detection,†Proc. IEEE Sensors, vol. 2019-Octob, pp. 2019–2022, 2019.

S. M. Doshi and E. T. Thostenson, “Thin and Flexible Carbon Nanotube-Based

Pressure Sensors with Ultrawide Sensing Range,†ACS Sensors, vol. 3, no. 7,

pp. 1276–1282, 2018.

S. Tamrakar, Q. An, E. T. Thostenson, A. N. Rider, B. Z. Haque, and J. W.

Gillespie, “Tailoring Interfacial Properties by Controlling Carbon Nanotube

Coating Thickness on Glass Fibers Using Electrophoretic Deposition,†ACS

Appl. Mater. Interfaces, vol. 8, no. 2, pp. 1501–1510, 2016.


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