Fig. 1

Fluorescence microscopy images of fingermarks developed with hybrid nanopowder (0.7 wt% C-dot—silica) on a glass slide under (a) violet, (b) blue, and (c) green excitation wavelength. A number of fluorescence images (captured at 100 magnification) have been merged via the Photoshop software to create the larger images displayed. Photoluminescence spectra (under different excitation wavelengths) of aqueous dispersions containing (d) 13 μg/ml CD’s and (e) 13 μg/ml CD’s in the presence of (150 times higher concentration) silica nanoparticles (Fernandes et al. 2015) (Reproduced from Chem. Commun., 2015, 51, 4902 with permission from the Royal Society of Chemistry)