A synthesis of fluorescent starch based on carbon nanoparticles for fingerprints detection

Carbon Dots for Forensic Applications: A Critical Review

“…The working principle for C-dot-based compositions for fingerprint recovery lies in the fact that they adopt different colours when illuminated by different light sources, enabling background-free images and maximising the reliability of fingerprint analysis. While C-dots in the solid state have a tendency to self-quench [39], several strategies have been proposed to overcome this effect, including the use of a diluent matrix [40,41], the development of core-shell nanostructures [42], the incorporation of heteroatom doping [43,44], exploitation of effects such as resonance energy transfer [RET] and π-π interactions [45] and the use of molecular spacers [46]. C-dot-based powders for fluorescent visualisation of latent fingerprints were first demonstrated by Fernandes et al [40], who showed that the incorporation of 0.7 wt.…”

“…Notably, automated fingerprint identification system (AFIS) analysis on a fresh fingerprint developed using the hybrid nanopowder revealed 71 minutiae compared to 65 minutiae revealed from a standard white powder under identical conditions. Li et al [41] incorporated 1% C-dots (synthesised pyrolytically from malic acid and ammonium oxalate) into starch powder and found similarly promising results for the fluorescent visualisation of latent fingerprints on a range of non-porous substrates (glass, white ceramic, black marble, aluminium foil and a coin). In certain cases, the C-dot/starch powder gave better results when compared to 502 cyanoacrylate glue vapour, TiO2 powder and iodine vapour.…”

“…The C-SiO2 nanopowder showed strong contrast when illuminated within the range 365-590 nm, while the commercial fluorescent powder was able to achieve this only under a very limited range of illumination wavelengths (Figure 4). Li et al [41] incorporated 1% C-dots (synthesised pyrolytically from malic acid and ammonium oxalate) into starch powder and found similarly promising results for the fluorescent visualisation of latent fingerprints on a range of non-porous substrates (glass, white ceramic, black marble, aluminium foil and a coin). In certain cases, the C-dot/starch powder gave better results when compared to 502 cyanoacrylate glue vapour, TiO 2 powder and iodine vapour.…”

Nanoparticles used for fingermark detection—A comprehensive review

“…Three studies used C‐dots mixed with various powders such as SiO 2 gel (M. Xu et al, ), SiO 2 NPs (Fernandes, Krysmann, & Kelarakis, ), laponite (Fernandes et al, ), or starch (H. Li, Guo, Liu, & Li, ). Xu et al mixed 5 mL of C‐dots solution with 5 g of SiO 2 gel.…”

“…The liquid was then evaporated to obtain a luminescence powder (M. Xu, He, et al, ). The other two studies mixed dried C‐dots at a concentration of 0.7 wt% (Fernandes et al, ) and 1 wt% (H. Li, Guo, et al, ). Of the three publications, Li et al was the only one presenting further testing of the luminescence powder on different substrates (various metals, plastic, and adhesive tape) and with fingermarks of different ages (from 1 day to 1 year).…”