Capillary electrophoresis of ultrasmall carboxylate functionalized silicon nanoparticles |
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Authors: | Eckhoff Dean A Stuart Jeffrey N Sutin Jason D B Sweedler Jonathan V Gratton Enrico |
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Institution: | Department of Physics and Laboratory for Fluorescence Dynamics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. deckhoff@uiuc.edu |
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Abstract: | Capillary electrophoresis is used to separate ultrasmall ( approximately 1 nm) carboxylate functionalized Si nanoparticles (Si-np-COO(-)) prepared via hydrosilylation with an omega-ester 1-alkene. The electropherograms show a monodisperse Si core size with one or two carboxylate groups added to the surface. On-column detection of their laser-induced fluorescence demonstrates that the individual Si-np-COO(-) have narrow emissions (full width at half maximum = 30-40 nm) with a nearly symmetric lineshape. Preparative scale electrophoresis should be a viable route for purification of the Si-np-COO(-) for further study and future applications. |
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