1. Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4a sección, San Luis Potosí S.L.P.; 78216 México
2. The Alan G. MacDiarmid NanoTech Institute; University of Texas at Dallas; Richardson TX 75083 USA
3. Institute for Carbon Science and Technology; Shinshu University; 4-17-1 Wakasato Nagano city 380-8553 Japan
4. CINVESTAV-Querétaro, Libramiento Norponiente 2000; Querétaro 76230 México
5. Instituto de Ingeniería y Tecnología, Departamento de Física y Matemáticas; Universidad Autónoma de Ciudad Juárez; Ave. Del Charro 450, Cd. Juárez C.P. 32310 Chihuahua México
6. Department of Physics & Center for 2-Dimensional and Layered Materials; The Pennsylvania State University; 104 Davey Lab. University Park PA 16802-6300 USA
7. Research Center for Exotic Nanocarbons (JST); Shinshu University; Wakasato 4-17-1 Nagano 380-8553 Japan
8. Department of Physics, Department of Chemistry, Department of Materials Science and Engineering and Materials Research Institute & Center for 2-Dimensional and Layered Materials; The Pennsylvania State University; 104 Davey Lab. University Park PA 16802-6300 USA