1. Research Center of Nano Science and Technology, Shanghai University; Shanghai 200444 China
2. Nanoscience and Technology Department; National Centre For Physics, Quaid-i-Azam University Campus; Islamabad Pakistan
3. Department of Chemistry; Quaid-i-Azam University; Islamabad Pakistan
4. Institute of Chemical Sciences, Gomal University; Dera Ismail Khan Pakistan
5. Department of Analytical Chemistry; Institute of Chemistry, UNSEP-Univ Estadual Paulista; Araraquara, Sao Paulo 14801-970 Brazil