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Coaxial Printing of Silicone Elastomer Composite Fibers for Stretchable and Wearable Piezoresistive Sensors.
Polymers (Basel) 2019; 11(4)P

Abstract

Despite the tremendous efforts dedicated to developing various wearable piezoresistive sensors with sufficient stretchability and high sensitivity, challenges remain pertaining to fabrication scalability, cost, and efficiency. In this study, a facile, scalable, and low-cost coaxial printing strategy is employed to fabricate stretchable and flexible fibers with a core-sheath structure for wearable strain sensors. The highly viscous silica-modified silicone elastomer solution is used to print the insulating sheath layer, and the silicone elastomer solutions containing multi-walled carbon nanotubes (CNTs) are used as the core inks to print the conductive inner layer. With the addition of silica powders as viscosifiers, silica-filled silicone ink (sheath ink) converts to printable ink. The dimensions of the printed coaxial fibers can be flexibly controlled via adjusting the extrusion pressure of the inks. In addition, the electro-mechanical responses of the fiber-shaped strain sensors are investigated. The printed stretchable and wearable fiber-like CNT-based strain sensor exhibits outstanding sensitivities with gauge factors (GFs) of 1.4 to 2.5 × 10⁶, a large stretchability of 150%, and excellent waterproof performance. Furthermore, the sensor can detect a strain of 0.1% and showed stable responses for over 15,000 cycles (high durability). The printed fiber-shaped sensor demonstrated capabilities of detecting and differentiating human joint movements and monitoring balloon inflation. These results obtained demonstrate that the one-step printed fiber-like strain sensors have potential applications in wearable devices, soft robotics, and electronic skins.

Authors+Show Affiliations

School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China. zhtangy@163.com.School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China. shjia@mail.xjtu.edu.cn.School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China. xuesongshisxs@163.com.School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China. polee00@163.com.School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China. francklinson@163.com.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30979015

Citation

Tang, Zhenhua, et al. "Coaxial Printing of Silicone Elastomer Composite Fibers for Stretchable and Wearable Piezoresistive Sensors." Polymers, vol. 11, no. 4, 2019.
Tang Z, Jia S, Shi X, et al. Coaxial Printing of Silicone Elastomer Composite Fibers for Stretchable and Wearable Piezoresistive Sensors. Polymers (Basel). 2019;11(4).
Tang, Z., Jia, S., Shi, X., Li, B., & Zhou, C. (2019). Coaxial Printing of Silicone Elastomer Composite Fibers for Stretchable and Wearable Piezoresistive Sensors. Polymers, 11(4), doi:10.3390/polym11040666.
Tang Z, et al. Coaxial Printing of Silicone Elastomer Composite Fibers for Stretchable and Wearable Piezoresistive Sensors. Polymers (Basel). 2019 Apr 11;11(4) PubMed PMID: 30979015.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Coaxial Printing of Silicone Elastomer Composite Fibers for Stretchable and Wearable Piezoresistive Sensors. AU - Tang,Zhenhua, AU - Jia,Shuhai, AU - Shi,Xuesong, AU - Li,Bo, AU - Zhou,Chenghao, Y1 - 2019/04/11/ PY - 2019/03/15/received PY - 2019/04/08/revised PY - 2019/04/09/accepted PY - 2019/4/14/entrez PY - 2019/4/14/pubmed PY - 2019/4/14/medline KW - carbon nanotube KW - coaxial printing KW - human motion monitoring KW - silicone elastomer KW - strain sensor JF - Polymers JO - Polymers (Basel) VL - 11 IS - 4 N2 - Despite the tremendous efforts dedicated to developing various wearable piezoresistive sensors with sufficient stretchability and high sensitivity, challenges remain pertaining to fabrication scalability, cost, and efficiency. In this study, a facile, scalable, and low-cost coaxial printing strategy is employed to fabricate stretchable and flexible fibers with a core-sheath structure for wearable strain sensors. The highly viscous silica-modified silicone elastomer solution is used to print the insulating sheath layer, and the silicone elastomer solutions containing multi-walled carbon nanotubes (CNTs) are used as the core inks to print the conductive inner layer. With the addition of silica powders as viscosifiers, silica-filled silicone ink (sheath ink) converts to printable ink. The dimensions of the printed coaxial fibers can be flexibly controlled via adjusting the extrusion pressure of the inks. In addition, the electro-mechanical responses of the fiber-shaped strain sensors are investigated. The printed stretchable and wearable fiber-like CNT-based strain sensor exhibits outstanding sensitivities with gauge factors (GFs) of 1.4 to 2.5 × 10⁶, a large stretchability of 150%, and excellent waterproof performance. Furthermore, the sensor can detect a strain of 0.1% and showed stable responses for over 15,000 cycles (high durability). The printed fiber-shaped sensor demonstrated capabilities of detecting and differentiating human joint movements and monitoring balloon inflation. These results obtained demonstrate that the one-step printed fiber-like strain sensors have potential applications in wearable devices, soft robotics, and electronic skins. SN - 2073-4360 UR - https://www.unboundmedicine.com/medline/citation/30979015/Coaxial_Printing_of_Silicone_Elastomer_Composite_Fibers_for_Stretchable_and_Wearable_Piezoresistive_Sensors_ L2 - http://www.mdpi.com/resolver?pii=polym11040666 DB - PRIME DP - Unbound Medicine ER -