1. Jiangsu Key Laboratory of Chemical Pollution Control and Resources ReuseSchool of Environmental and Biological EngineeringNanjing University of Science and Technology Nanjing 210094 P. R. China
2. Australian Institute for Bioengineering and NanotechnologyThe University of Queensland Brisbane QLD 4072 Australia
3. Department of Electronic EngineeringSchool of Information Science TechnologyEast China Normal University Shanghai 200241 P. R. China
4. School of Chemistry and Molecular EngineeringEast China Normal University Shanghai 200241 P. R. China
5. Herbert Gleiter Institute of NanoscienceNanjing University of Science and Technology Nanjing 210094 P. R. China