1. Advanced Functional Materials & Nanotechnology Group, Centro de Investigación en Materiales Avanzados S. C. (CIMAV-Unidad Monterrey), Av. Alianza Norte 202, Autopista Monterrey-Aeropuerto Km 10, PIIT, C.P. 66628 Apodaca-Nuevo León, México
2. Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León (UANL), AP 1864, 64570 Monterrey-Nuevo León, México
3. Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States
4. University of Tennessee, Knoxville, Tennessee 37996, United States
5. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States