1. Polymer Science Group, Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia
2. International Business Machines − Almaden Research Center, 650 Harry Road, San Jose, California 95120, United States
3. IBM Research at Albany Nanotech, 257 Fuller Road, Albany, New York 12203, United States
4. International Business Machines − Semiconductor Technology Research, 257 Fuller Road, Albany, New York 12203, United States