1. Department of Chemical and Materials Engineering, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
2. The University of Waikato, Hamilton 3240, New Zealand
3. National Isotope Centre, GNS Science, P.O. Box 30368, Lower Hutt 5010, New Zealand
4. MacDiarmid Institute of Advanced Materials and Nanotechnology, Victoria University of Wellington, P.O.
Box 600, Wellington 6140, New Zealand