1. Department of Materials Chemistry, Uppsala University, Ångström Laboratory P.O. Box 538, SE-751 21 Uppsala, Sweden, Department of Applied Science, The College of William and Mary, 325 McGlothin Street Hall, Williamsburg, Virginia 23187, Luna Innovations NanoWorks Division, 521 Bridge Street, Danville, Virgina 24541, and Department of Biochemistry and Organic Chemistry, Uppsala University, BMC, P.O. Box 576, SE-751 23 Uppsala, Sweden