1. Department of Chemistry and Materials Research Center; Northwestern University; Evanston IL 60208 USA
2. Graduate Program in Applied Physics; Northwestern University; Evanston IL 60208 USA
3. Department of Physics; Missouri University of Science and Technology; Rolla MO 65409 USA
4. Polyera Corporation; 8045 Lamon Avenue Skokie IL 60077 USA
5. Department of Materials Science and Engineering and Materials Research Center; Northwestern University; Evanston IL 60208 USA