1 Bioinspired Engineering and Biomechanics Center (BEBC), Xi'an Jiaotong University, 28 Xianning West Rd., Xi'an 710049, China; Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, 102 Youyi Rd., Beijing 100094, China.
2 Bioinspired Engineering and Biomechanics Center (BEBC), Xi'an Jiaotong University, 28 Xianning West Rd., Xi'an 710049, China.
3 Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China.
4 Bioinspired Engineering and Biomechanics Center (BEBC), Xi'an Jiaotong University, 28 Xianning West Rd., Xi'an 710049, China; MOE Key Laboratory of Biomedical Information Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China. Electronic address: fengxu@mail.xjtu.edu.cn.