Scanning electron microscopy image and optical spectra of the silica nanoparticles. (a) Scanning electron microscopy image of the silica nanoparticles with a diameter of 1,100 nm. (b) Optical spectra of silica nanoparticles with diameters of 600 nm (dash-dot) and 1,100 nm (dash) compared to absorption spectrum of the PCP complex solution (solid) as well as its fluorescence (dot).
Krajnik et al. Nanoscale Research Letters 2013 8:146 doi:10.1186/1556-276X-8-146