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Gratton, Enrico Eckhoff, Dean Alan 2015-09-25T20:02:58Z 2015-09-25T20:02:58Z 10000-01-01 2006 2006 In the second part, three central elements establish that the carboxyl-functionalized Si-np have excellent potential for use as a luminescent marker in aqueous systems. First, they are shown to be ultrasmall, with a diameter of ∼1 nm, comparable to that of common organic fluorophores. Second, they are shown to have narrow PL in the near-UV with a nearly-symmetric lineshape and a FWHM as small as 30 nm. Third, it is shown that standard chemical means can be used to functionalize the Si-np with carboxyl groups, giving them stability in polar (e.g. aqueous) environments and providing a route for attachment to various biomolecules through their reaction with primary amines. The capability for direct coupling with organic species through a strong and stable Si-C linkage is a defining characteristic of Si-np and offers tremendous flexibility with possible surface passivations and functionalities for this class of luminophores. Made available in DSpace on 2015-09-25T20:02:58Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3242839.pdf: 3023536 bytes, checksum: 32c116898d2b03b7fc3bb47052502527 (MD5) Previous issue date: 2006 Embargo set by: Seth Robbins for item 81818 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 115 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2006. http://hdl.handle.net/2142/80536 (MiAaPQ)AAI3242839 eng Biophysics, General Optical Characterization of Ultrasmall, Hydrogen -Terminated and Carboxyl -Functionalized Silicon Nanoparticles in Aqueous Environments text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.