1. Theoretical and Physical Chemistry Institute; National Hellenic Research Foundation; 48 Vassileos Constantinou Avenue Athens 11635 Greece
2. Inorganic Functional Materials Research Institute; National Institute of Advanced Industrial Science and Technology (AIST); Anagahora 2266-98, Shimoshidami, Moriyamaku Nagoya 463-8560 Japan
3. Nanomaterials Research Institute; National Institute of Advanced Industrial Science and Technology (AIST); Central 5, 1-1-1 Higashi Tsukuba 305-8565 Japan
4. Department of Electronic Engineering; Tohoku University; 6-6-05 Aoba, Aramaki, Aoba-Ku Sendai 980-8579 Japan
5. Institut des Materiaux Jean Rouxel, CNRS; Universite de Nantes; 2 Rue de la Houssiniere, BP32229 44322 Nantes France