1. School of Mathematics and Physics, The University of Queensland, St. Lucia QLD 4072, Australia
2. The MacDiarmid Institute of Advanced Materials and Nanotechnology, Industrial Research Limited, Lower Hutt 5040, New Zealand
3. Biomarker Research and Development Centre, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St. Lucia QLD 4072, Australia
4. Izon Science Ltd., Bishopdale, Christchurch, 8543, New Zealand
5. Jenner Institute, Oxford University, Headington, Oxford, OX3 7DQ, United Kingdom