1. Laboratory of Polymers and Composites (LAPOM), Department of Materials Science and Department of Physics, University of North Texas, Denton, TX 76203-5310, USA
2. Department of Applied Physics and Advanced Technologies (FATA), National Autonomous University of Mexico, Ap. 1–1010, Queretaro, Qro. 67000, Mexico
3. School of Electronic Engineering and Computer Systems, University of Wales, Bangor LL57 1UT, United Kingdom
4. FB-6 Physical Chemistry, Gerhard Mercator University, 47048 Duisburg, Germany