Micro-structured fluorescent powders for detecting latent fingerprints on different types of surfaces

Interpol review of fingermarks and other body impressions 2016–2019

“…All the articles below refer to the application of micron-sized particles. Preliminary/Pilot studies : Several kinds of compounds were proposed to detect fingermarks on non-porous substrates through powder dusting: ABC dry fire extinguisher powder [ 354 ], Fuller’s earth [ 355 ], anthracene and naphthalene [ 356 ], BaTiO 3 :Dy 3+ microspheres [ 357 ], chitosan-tripolyphosphate microparticles [ 358 ], La 2 (MoO 4 ) 3 :Eu 3+ microcrystals [ 359 ], phenyl-doped graphitic carbon nitride [ 360 ], bis(salicylidene)cyclohexyl-1,2-diamino zinc(II) complex [ 361 ], functionalized montmorillonite [ 362 , 363 ], carbon dot@TiO 2 core-shell composite [ 288 ], household powders such as gram flour, coriander, cumin or black pepper [ 364 ], Ca 4 (PO 4 ) 2 O:Eu 2+ phosphors [ 365 ], Eu(Phen) 2 complex intercalated clay hybrids [ 366 ], AIE-based magnetic powder doped with tetraphenylethene derivatives [ 367 ], pyrene [ 368 ], silica microparticles coated with phenanthro imidazole derivative [ 369 ], europium (III) coordination polymer [ 370 ], Yb 3+ /Er 3+ co-doped ceramics presenting upconversion properties [ 371 ], cationic dye – diatomite composite [ 372 ], benzazole-doped silica microparticles [ 373 ], Yb 3+ /Er 3+ /Tm 3+ doped fluorides presenting upconversion properties [ 374 ], porous graphitic carbon nitride [ 375 ], YBO 3 :Eu 3+ /Tb 3+ phosphors [ 376 ], Mg 2 TiO 4 :Mn 4+ phosphor [ 377 ], carbazolyl-based phosphor [ 378 ], and AIE-based imidazole derivatives [ 379 ]. It should be emphasized that several of these studies are conducted with an extremely low number of donors leaving fresh, sebum-rich fingermarks.…”

Recent Trends in Fluorescent Organic Materials for Latent Fingerprint Imaging

“…Benzazole dyes were made into the form of microstructured fluorescent powders by a silica matrix, showing excellent fluorescent images for fingerprint detection on different types (porous and non-porous) and colors (dark, white, and multi-colored) of surfaces. Compared with commercially available black, white, and fluorescent powders (Sirchie®), the developed microstructured powders showed intense fluorescence emission in the blue-green region, and a sharp contrast with the fingerprint residues when exposed to 365 nm UV light, producing distinct ridge details on all examined surfaces (Barros and Stefani, 2019 ).…”

Novel organic–inorganic hybrid powder SrGa12O19:Mn2+–ethyl cellulose for efficient latent fingerprint recognitionviatime-gated fluorescence

“…Previous research has reported the benets of using phosphors for LFP imaging, which include exceptional photochemical stability, almost no morphological variations, low costs, and low toxicity. 10,28 Background uorescence can be completely eliminated by using phosphors with long persistent luminescence (LPL), such as those used in biological imaging, which have remarkable signal-to-noise ratios. 29,30 The use of nano-long aerglow particles for achieving latent ngerprint visualization without background uorescence has been reported.…”