Fig. 2From: Bioprobes Based on Aptamer and Silica Fluorescent Nanoparticles for Bacteria Salmonella typhimurium Detection a TEM image of carboxyl-modified Rubpy-doped silica nanoparticles. b Fluorescence emission spectra of RuBPY dye (curve a) and carboxyl-modified Rubpy-doped silica nanoparticles (curve b)Back to article page