Capillary electrophoresis of ultrasmall carboxylate functionalized silicon nanoparticles.
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.
Eckhoff
Dean A
DA
Department of Physics and Laboratory for Fluorescence Dynamics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. deckhoff@uiuc.edu
Stuart
Jeffrey N
JN
Sutin
Jason D B
JD
Sweedler
Jonathan V
JV
Gratton
Enrico
E
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
D000475:Alkenes; D002264:Carboxylic Acids; D012825:Silicon