[1] Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Minist Educ, Nanjing 210016, Jiangsu, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut, Key Lab Intelligent Nano Mat & Devices, Minist Educ, Nanjing 210016, Jiangsu, Peoples R China
[3] Rice Univ, Dept Mat Sci & NanoEngn, Houston, TX 77005 USA
[4] Rice Univ, Dept Chem, POB 1892, Houston, TX 77005 USA