1. BMI Center for Biomass Materials and NanointerfacesSchool of Biomass Science and EngineeringSichuan University Chengdu 610065 China
2. Wyss Institute for Biologically Inspired EngineeringHarvard University Boston MA 02115 USA
3. Key Laboratory of Radiation Physics and TechnologyMinistry of EducationInstitute of Nuclear Science and TechnologySichuan University Chengdu 610064 China
4. John A. Paulson School of Engineering and Applied SciencesHarvard University Cambridge MA 02138 USA
5. National Engineering Laboratory for Clean Technology of Leather ManufactureSichuan University Chengdu 610065 China