Silicon quantum dots have been synthesized in micelles. Particle sizes have been ascertained by transmission electron microscopy and UV-Vis absorption and photoluminescence spectroscopy. The surface of the silicon and germanium particles produced have been modified to produce hydrophobic and hydrophilic particles by reaction with either with 1-heptene or allylamine respectively. For biological applications control of the surface character of the nanocrystals is essential. FTIR spectra show the surface modification of the particles by 1-heptene or allylamine.
Photoluminescent water-soluble silicon nanocrystals were synthesized using solution-phase wet chemistry techniques. Adjustment of the mean size and size distribution was achieved by adjusting the rate of addition of the hydride reducing agent. When the reducing agent was added slowly the mean size of the silicon nanocrystals was 1.4nm with a monodisperse size distribution. However, when the reducing agent was added rapidly the size distribution enlarged and concomitantly the
mean sized also increased. The photoluminescence and photoluminescence excitation spectra from the monodisperse sample show narrower features when compared to the solution with the large size distribution. This provides direct evidence for size dependant effects on the photoluminescence of silicon nanocrystals.
Silicon quantum dots have been synthesized in micelles. Particle sizes have been ascertained by transmission electron microscopy and UV-Vis absorption and photoluminescence spectroscopy. The
surface of the silicon particles produced have been modified to produce hydrophobic and hydrophilic particles by reaction with either with 1-heptene or allylamine respectively. For biological applications
control of the surface character of the nanocrystals is essential. FTIR spectra show the surface modification of the particles by 1-heptene or allylamine.
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