Figure 2
From: Octahedral faceted Si nanoparticles as optical traps with enormous yield amplification
Typical Raman spectra obtained in bulk-Si and for two samples covered with Si-NPs.
The cm3/cm2 unit refers to the volume of Si (cm3) contained in the Si-NPs per unit area (cm2). The data refer to the total volume of Si-NPs per unit area. A huge signal increase without a shift and/or broadening of the Si peak (see inset) is obtained by the Si-NPs relative to the bulk Si, even though the probed volume is 4 orders of magnitude smaller than that of the bulk Si (≈10−12 cm3). The ratio between the Stokes and anti-Stokes peaks remains constant from the bulk Si to the Si-NP samples.
