1. Lyles School of Civil Engineering and Birck Nanotechnology Center Purdue University West Lafayette IN 47906 USA
2. School of Materials Engineering and Birck Nanotechnology Center Purdue University West Lafayette IN 47906 USA
3. Department of Electrical and Computer Engineering Missouri University of Science and Technology Rolla MO 65409 USA
4. Southern Polytechnic College of Engineering and Engineering Technology Kennesaw State University Marietta GA 30060 USA