1. Department of Physics, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, United States
2. Department of Chemistry & Biochemistry, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, United States
3. Department of Material Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
4. Soldier Protection Directorate, US Army Development Command Soldier Center, Natick, Massachusetts 01760, United States