A highly stretchable, super-hydrophobic strain sensor based on polydopamine and graphene reinforced nanofiber composite for human motion monitoring. (15th January 2020)

• Record Type: Journal Article
• Authors: Li, Bei; Luo, Junchen; Huang, Xuewu; Lin, Liwei; Wang, Ling; Hu, Mingjun; Tang, Longcheng; Xue, Huaiguo; Gao, Jiefeng; Mai, Yiu-Wing
• Is Part Of: Composites. Number 181(2020)
• Publication Date: 2020-01-15
• Subjects: Superhydrophobic -- Electrically conductive -- Nanofiber composite -- Stretchable -- Wearable strain sensor -- Human motion monitoring; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2019.107580
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: Much attention has been given to flexible electronic devices in recent years. Conductive polymer composites (CPCs) have been utilized to fabricate strain sensors owing to their lightweight and high flexibility. It is a great challenge to develop flexible and wearable strain sensors with light weight, good skin affinity and gas permeability, high sensitivity and excellent corrosion resistance. In this work, electrospun thermoplastic polyurethane (TPU) nanofibers were first decorated by graphene through ultra-sonication, followed by polydopamine (PDA) modification and then hydrophobic treatment with 1 H, 1 H, 2 H, 2 H -perfluorodecanethiol (PFDT). The obtained electrical conductive polymer nanofiber composites (CPNCs) have a hierarchical polymer core/graphene shell structure and exhibit super-hydrophobicity even under harsh environments. The introduction of PDA not only improves the interfacial interaction between individual graphene sheets but also the interaction between graphene and the TPU nanofibers. Their mechanical properties including Young's modulus, tensile strength and elongation at break are significantly improved, compared to those of TPU nano-fibrous membranes. When CPNC is used as a strain sensor, it displays high stretchability, controllable sensitivity, excellent cyclical stability and durability. Hence, the nanofiber composite based strain sensor can be attached on the skin for precise monitoring of different human motions, such as tiny and large body movements and thus has promising applications in wearable devices. Highlights: A flexible and conductive polymer nanofiber composite (CPNC) is prepared. The CPNC possesses a polymer core/graphene shell structure. The CPNC possesses excellent superhydrophobicity and corrosion resistance. The CPNC strain sensor shows high stretchability, sensitivity and good durability. The CPNC strain sensor can be used for full range detection of human body motions.