[1] Chinese Acad Sci, Beijing Inst Nanoenergy & Nanosyst, CAS Ctr Excellence Nanosci, Beijing Key Lab Micronano Energy & Sensor, Beijing 101400, Peoples R China
[2] Tsinghua Univ, State Key Lab Tribol Adv Equipment, Beijing 100084, Peoples R China
[3] Univ Chinese Acad Sci, Sch Nanosci & Engn, Beijing 100049, Peoples R China
[4] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
[5] Guangxi Univ, Ctr Nanoenergy Res, Sch Phys Sci & Technol, Nanning 530004, Peoples R China
[6] Jiangsu Univ, Inst Intelligent Flexible Mechatron, Zhenjiang 212013, Peoples R China
[7] Beijing Acad Sci & Technol, Inst New Mat & Adv Mfg, Beijing 100084, Peoples R China