1. The MacDiarmid Institute of Advanced Materials and Nanotechnology, A New Zealand Centre of Research Excellence, Wellington New Zealand
2. School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington 6012, New Zealand
3. The Department of Physics, University of Auckland, Private Bag 92019, Auckland 1010, New Zealand
4. School of Physical and Chemical Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
5. The Hong Kong University of Science and Technology (HKUST), Clear Water Bay Road, Kowloon, Hong Kong 999077, Hong Kong S.A.R.