1. Department of Materials Science and Engineering, University of Toronto , Toronto, ON , Canada
2. Hitachi High-Tech Corp. , Hitachinaka-shi, Ibaraki , Japan
3. Department of Chemistry, University of Toronto , Toronto, ON , Canada
4. Department of Physics, University of Toronto , Toronto, ON , Canada
5. Hitachi High-Tech Canada Inc. , Toronto, ON , Canada
6. Department of Chemical Engineering & Applied Chemistry, University of Toronto , Toronto, ON , Canada