1. Université de Bordeaux 1, ISM, ENSCBP, 33607 Pessac Cedex, France
2. Center of Nanotechnology and Chemistry Department, Kasetsart University, Bangkok 10900, Thailand
3. CNRS, UPR-9048, Université de Bordeaux 1, ICMCB, 87 Avenue du Dr. A. Schweitzer, 33608 Pessac Cedex, France