1. School of Chemistry and Chemical Engineering; Queen's University, David Keir Building; Stranmillis Road Belfast BT9 5AG, Northern Ireland United Kingdom, Fax: +44 2890 97 4687, Tel.: +44 2890 97 4412
2. Chemistry Department; Faculty of Science - Qena; South Valley University; Qena 83523 - Egypt
3. Centre for Nanostructured Media; School of Mathematics and Physics; Queen's University Belfast; BT7 1NN UK
4. Department of Chemical and Environmental Sciences; Materials and Surface Science Institute; University of Limerick; Limerick Ireland