1. Department of Mechanical EngineeringCollege of EngineeringTexas A&M UniversityCollege Station77843‐3123TXUSA
2. Bruker Nano SurfacesEden PrairieMN 55344USA
3. State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing210016P. R. China
4. Departments of Materials Science and Engineering, Biomedical Engineering, Chemistry, Mechanical Engineering, Electrical Engineering and Computer ScienceCenter for Bio‐Integrated ElectronicsSimpson Querrey Institute for Nano/BiotechnologyNorthwestern UniversityEvanstonIllinois 60208USA