1. Department of Chemical and Materials Engineering, The University of Auckland, Auckland 1142, New Zealand
2. School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealand
3. School of Chemistry, University of New South Wales, Sydney, New South Wales 2052, Australia
4. MacDiarmid Institute of Advanced Materials and Nanotechnology, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand