title: Capillary electrophoresis of ultrasmall carboxylate functionalized silicon nanoparticles.
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.
authors.affiliation: Department of Physics and Laboratory for Fluorescence Dynamics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. deckhoff@uiuc.edu
authors.forename: Dean A
authors.initials: DA
authors.lastname: Eckhoff
authors.forename: Jeffrey N
authors.initials: JN
authors.lastname: Stuart
authors.forename: Jason D B
authors.initials: JD
authors.lastname: Sutin
authors.forename: Jonathan V
authors.initials: JV
authors.lastname: Sweedler
authors.forename: Enrico
authors.initials: E
authors.lastname: Gratton
mesh_terms: D000475:Alkenes / Q000737:chemistry; D002264:Carboxylic Acids / Q000737:chemistry*; D002627:Chemistry, Physical / Q000379:methods*; D019075:Electrophoresis, Capillary / Q000379:methods*; D053768:Metal Nanoparticles / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D012825:Silicon / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods; D013997:Time Factors
chemical_list: D000475:Alkenes; D002264:Carboxylic Acids; D012825:Silicon