1. Key Laboratory of Green PrintingInstitute of ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
2. Beijing Engineering Research Center of Nanomaterials for Green Printing TechnologyBeijing National Laboratory for Molecular Sciences Beijing 100190 P. R. China
3. State Key Laboratory of Nonlinear Mechanics, Institute of MechanicsChinese Academy of Sciences Beijing 100190 P. R. China