Enhancing the Scratch Resistance by Introducing Chemical Bonding in Highly Stretchable and Transparent Electrodes

被引:62
作者
Guo, Chuan Fei [1 ,2 ]
Chen, Yan [3 ]
Tang, Lu [1 ,2 ]
Wang, Feng [1 ,2 ]
Ren, Zhifeng [1 ,2 ]
机构
[1] Univ Houston, Dept Phys, Houston, TX 77204 USA
[2] Univ Houston, TcSUH, Houston, TX 77204 USA
[3] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
基金
中国国家自然科学基金;
关键词
Scratch resistance; Au-S bond; stretchability; localized rupture; stretchable transparent electrodes; SILICON SURFACE; FILMS; GOLD; NETWORK; DEVICES; UNIFORM; CELLS;
D O I
10.1021/acs.nanolett.5b04290
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Stretchable transparent electrodes are key elements in flexible electronics and e-skins. However, existing stretchable transparent electrodes, including graphene sheets, carbon nanotube, and metal nanowire networks, weakly adheres to the substrate by van der Waals forces. Such electrodes suffer from poor scratch-resistance or poor durability, and this issue has been one of the biggest problems for their applications in industry. Here we show that, by introducing a Au-S bond between a Au nanomesh (AuNM) and the underlying elastomeric substrate, the AuNM strongly adheres to the substrate and can withstand scratches of a pressure of several megapascals. We find that the strong chemical bond, on the other hand, leads to a stiffening effect and localized rupture of the AuNM upon stretching; thus the stretchability is poor. A prestraining process is applied to suppress the localized rupture and has successfully improved the stretchability: electrical resistance of the prestrained AuNM exhibits modest change by one-time stretching to 160%, or repeated stretching to 50% for 25 000 cycles. This conductor is an ideal platform for robust stretchable photoelectronics. The idea of introducing a covalent bond to improve the scratch-resistance may also be applied to other systems including Ag nanowire films, carbon nanotube films, graphene, and so forth.
引用
收藏
页码:594 / 600
页数:7
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