The ratio of the silicon to silica integrated Raman intensities. The ratio of the Raman intensities as a function of nanoparticle concentration (in the initial gel preparation) for LH, LO and SO particles (red squares, blue dots and green triangles respectively). Unconstrained linear least-squares fits to each dataset are also shown (solid lines).
Amonkosolpan et al. Nanoscale Research Letters 2012 7:397 doi:10.1186/1556-276X-7-397