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Functional Inorganic Materials and Devices
Highly Stretchable Room-Temperature Self-Healing Conductors Based on Wrinkled Graphene Films for Flexible Electronics Shuang Yan, Gongzheng Zhang, Haoyang Jiang, Feibo Li, Li Zhang, Yanhong Xia, Zhaoshuo Wang, Yukai Wu, and Huan-Jun Li ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.9b00274 • Publication Date (Web): 25 Feb 2019 Downloaded from http://pubs.acs.org on February 27, 2019
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ACS Applied Materials & Interfaces
Highly Stretchable Room-Temperature Self-Healing Conductors Based on Wrinkled Graphene Films for Flexible Electronics
Shuang Yan, Gongzheng. Zhang, Haoyang. Jiang, Feibo. Li, Li Zhang, Yanhong. Xia, Zhaoshuo. Wang, Yukai. Wu, Huanjun. Li*
School of Chemistry and Chemical Engineering; Beijing Institute of Technology; 100081, P. R. China
Keywords: graphene, bilayer composite film, self-healing, stretchable, flexible electronics
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Abstract Flexible conductors are emerging soft materials for diverse electric applications. However, it still remains a great challenge to fabricate high-performance soft conductors that are highly conductive, largely stretchable, and rapid room-temperature self-healable. Here, we design and fabricate flexible conductive bilayer composite films comprised of healable elastomeric substrates and wrinkled graphenes. The elastomeric substrates, obtained by a facile bulk copolymerization of N-isopropylacrylamide and 2-methoxyethyl acrylate, show fast roomtemperature self-healing efficiency of up to 96%, imparted by the reversible hydrogen bonds. Importantly, the substrates also display strong interfacial adhesion crucial to the formation of stable bilayer composite films based on prestrain route. The synergy between self-healing of the substrates and wrinkled structures of graphene is endowed to the composite films for mechanical and electrical healing. By adjusting the prestrain ratio of the substrates, the composite films could display the tunable stretchability, conductivity, and self-healing. The optimal bilayer composite film exhibits high conductivity of 126 S cm-1, large stretchability of 300%, rapid room-temperature self-healing. Moreover, it is demonstrated that the composite films are strain sensitive and can be used as strain sensors to monitor stretching deformation and human motion. These prominent demonstrations suggest a great potential of the bilayer composite films in nextgeneration wearable electronics.
Introduction Stretchable and flexible electronics have recently attracted increasing attention because of their various applications such as intelligent sensor systems,1 human motion detection,2-4 health monitoring.5-11 For practical applications, some irreversible mechanical damages resulting from
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ACS Applied Materials & Interfaces
large deformation and accidental fracture are inevitable in conventional flexible electronic devices. These damages would seriously degrade safety and lifetime of the flexible electronic, leading to the complete collapse of the electronic devices. To overcome this problem, introducing self-healing ability to soft conductors is of vital importance to address the degradation of the device performance after mechanical damages. In recent years, several attempts have been devoted to developing conductive self-healing materials for applications in soft electronic field.12-19 For example, Bao et al.12 pioneered a intrinsic self-healing composite with high conductivity of up to 40 S cm-1 by combining a supramolecular polymer and nickel microparticles at ambient conditions. However, this system requires high volume percentage of fillers and shows low stretchability(
