Capillary electrophoresis of ultrasmall carboxylate functionalized silicon nanoparticles.
- Author(s): Eckhoff, Dean A;
- Stuart, Jeffrey N;
- Sutin, Jason DB;
- Sweedler, Jonathan V;
- Gratton, Enrico
- et al.
Published Web Locationhttps://doi.org/10.1063/1.2345366
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.