1. MacDiarmid Institute for Advanced Materials and Nanotechnology School of Physical and Chemical Sciences University of Canterbury Private Bag 4800 Christchurch 8041 New Zealand
2. Current address Bernal Institute University of Limerick Limerick V94 T9PX Ireland
3. Univ. Bordeaux, CNRS, Centre de Recherche Paul Pascal, UMR 5031 33600 Pessac France