Optical Characterization of Ultrasmall, Hydrogen -Terminated and Carboxyl -Functionalized Silicon Nanoparticles in Aqueous Environments
Eckhoff, Dean Alan
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https://hdl.handle.net/2142/80536
Description
Title
Optical Characterization of Ultrasmall, Hydrogen -Terminated and Carboxyl -Functionalized Silicon Nanoparticles in Aqueous Environments
Author(s)
Eckhoff, Dean Alan
Issue Date
2006
Doctoral Committee Chair(s)
Gratton, Enrico
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biophysics, General
Language
eng
Abstract
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.
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