Ultrasensitive micro/nanocrack-based graphene nanowall strain sensors derived from the substrate's Poisson's ratio effect

Hongyan Sun, Chen Ye, Gang Zhao, Huan Zhang, Zhiduo Liu, Wen Dai, Junjie Wang, Fakhr E. Alam, Qingwei Yan, Xinming Li, Jian Xu, Chin Yin Chen, Pei Zhao, Jichun Ye, Nan Jiang, Ding Chen^*, Sudong Wu, Jing Kong, Cheng Te Lin