1. Key Laboratory of Green PrintingCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of Sciences (ICCAS)Beijing Engineering Research Center of Nanomaterials for Green Printing TechnologyNational Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China
2. University of Chinese Academy of Sciences Beijing 100049 P. R. China
3. Department of Engineering MechanicsAMLTsinghua University Beijing 100084 P. R. China
4. Department of Engineering MechanicsInstitute of Biomechanics and Medical EngineeringTsinghua University Beijing 100084 P. R. China
5. Center for Nano and Micro MechanicsTsinghua University Beijing 100084 P. R. China
6. Beijing Institute of Nanoenergy and NanosystemsChinese Academy of Sciences Beijing 100083 P. R. China