1. Micropropulsion and Nanotechnology Laboratory, School of Engineering and Applied Science, George Washington University, 800 22nd St. NW, Suite 3100, Washington, D.C. 20052, United States of America
2. Scanning Probe Microscopy Laboratory, School of Engineering and Applied Science, George Washington University, 800 22nd St. NW, Suite 3900, Washington, D.C. 20052, United States of America
3. School of Mechanical Engineering, Shanghai Jiaotong University, 800th Dongchuan Rd., Shanghai 200240, People’s Republic of China
4. School of Electrical Engineering, Tel Aviv University, Wolfson Building, Chaim Levanon St 30, 6997801 Tel Aviv-Yafo, Israel