1. Center of Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
2. Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
3. Nanomaterials Centre, Australian Institute for Bioengineering & Nanotechnology and School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, Queensland 4072, Australia
4. Chemical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia