1. Department of Chemistry; State University of New York at Binghamton; Binghamton New York 13902 USA
2. Department of Chemistry; University of South Dakota; Vermillion South Dakota 57069 USA
3. Center for Functional Nanomaterials; Brookhaven National Laboratory; Upton New York 11973 USA
4. Chapel Hill Analytical and Nanofabrication Laboratory; University of North Carolina at Chapel Hill; Chapel Hill North Carolina 27599 USA
5. Chemical Synthesis and Pollution Control, Key Laboratory of Sichuan Province; College of Chemistry and Chemical Industry; China West Normal University; Nanchong, Sichuan 637009 China
6. Department of Materials Science and Engineering; University of Michigan; Ann Arbor Michigan 48109 USA
7. College of Chemical Engineering; China University of Petroleum; Qingdao, Shandong 266580 China