Latest Research Achievement Published at Cover Page of the International Top Journal

Recently, Zhao Shanshan，a postgraduate of class 2020 at School of Optical-electrical and Computer Engineering published the latest research achievement in Advanced Materials Technologies (IF: 8.856). The paper reports the superelastic conductive fibers with fractal helices for flexible electronic applications, which enjoys very important academic meaning and practical values, serving as the cover paper of a certain issue. Zhao Shanshan is a member of Untra-precision Optical Manufacture Innovation Team, led by Academician Zhuang Songlin, Professor Zhang Dawei. Other team members like Chen Juan, Zhou Jingyu, Shi Shangxuan, Hou Miao all engage in the research. Dr. Sheng Bin is the corresponding author of the paper.
The widespread application of flexible electronic devices places higher demands for stretchable conductors as crucial components owing to their stable and consistently high conductivity and high stretchability. In this study, a superelastic conductive fractal helix fiber (FHF) consisting of a thermoplastic polyurethane fiber and Ag wire is developed, which exhibits excellent waterproofing ability. The maximum strain of the FHF can be improved to 8300% by increasing the helical index C and Ag wire winding density. A high conductivity of 6.3 × 107 S m−1 and ultra-high Q value of 3.37 × 104 at a strain of 5600% are realized for the conductive fiber owing to its fractal helical structure. The elastic limit point A of the FHF can be obtained by the relative resistance change (0.166%) to ensure that elastic deformation only occurs when stress is applied. In the elastic strain range, FHF demonstrates high electrical reliability under repeated deformation (over 10 000 cycles of stretching with a strain of 5600%) with a negligible increase in resistance. Moreover, the FHF can be easily integrated with the fabrics as an interconnection for wearable electronics. The newly developed twined FHF can also be used as a capacitive strain sensor to monitor human activity.

Link to the cover page: https://onlinelibrary.wiley.com/doi/10.1002/admt.202370034

Link to the paper: https://doi.org/10.1002/admt.202201951