[1] Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Clear Water Bay, Hong Kong, Peoples R China
[2] Chinese Univ Hong Kong, Sch Sci & Engn, Shenzhen 518172, Guangdong, Peoples R China
[3] Nanyang Technol Univ, Sch Mat Sci & Engn, Innovat Ctr Flexible Devices, 50 Nanyang Ave, Singapore 639798, Singapore