1. Department of Physics, University of Otago, 730 Cumberland Street, North Dunedin, Dunedin 9016, New Zealand
2. MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand
3. Department of Mechanical and Manufacturing Engineering, Miami University, 56 Garland Hall, 650 E. High St., Oxford, Ohio 45056
4. National Isotope Centre (NIC), GNS Science University, 30 Gracefield Road, Lower Hutt, Wellington 5010, New Zealand