1. Department of Materials Science and Engineering and Erik Jonsson School of Engineering and Computer Science; University of Texas at Dallas; Richardson TX 75083 USA
2. Department of Electrical Engineering and Computer Sciences; College of Engineering; South Dakota State University; Brookings SD 57007 USA
3. Department of Applied Chemistry; Xi'an Jiaotong University; Xi'an 710049 P. R. China
4. Department of Chemistry; University of Texas at Dallas; Richardson TX 75083 USA
5. Center for Nanotechnology and Molecular Materials; Department of Physics; Wake Forest University; Winston-Salem NC 27106 USA
6. Department of Synthetic Chemistry and Biological Chemistry; Kyoto University Katsura Campus; Nishikyo-ku Kyoto 615-8510 Japan