1. Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409 (Q.Y.L., P.K.D.); NanoTech Center, Texas Tech University, Lubbock, Texas 79409 (P.K.D., H.T.); and Sandia National Laboratory, Albuquerque, New Mexico 87185 (M.H.C., A.J.F., A.A.A., K.H.A.B., S.R.L.)