1. School of Mechanical and Aerospace Engineering Nanyang Technological University Singapore 639798 Singapore
2. CINTRA CNRS/NTU/THALES UMI 3288, Research Techno Plaza Singapore 637553 Singapore
3. School of Materials Sciences and Engineering Collaborative Innovation Center of Nano Functional Materials and Applications Henan University Kaifeng 475004 China
4. Department of Mechanical Science and Engineering University of Illinois at Urbana−Champaign Urbana IL 61801 USA
5. School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 Singapore