Surfactant-Assisted BaTiO₃:Eu³⁺@SiO₂ Core–Shell Superstructures Obtained by Ultrasonication Method: Dormant Fingerprint Visualization and Red Component of White Light-Emitting Diode Applications

Abstract

Nanoparticles (NPs) synthesized via a facile sonochemical route showed excellent assembly of BaTiO 3 :Eu 3+ @SiO 2 superstructures (SS) using CTAB as a surfactant. Crystallite size, phase, surface science, and core−shell confirmation were determined through advanced characterization techniques. Experimental parameters like pH, temperature, and surfactant concentration were varied and resulted in SS with high surface modifications, and the possible mechanisms for the same are reported. Scanning electron microscopy images revealed broomlike structures, and various experimental parameters resulting in them dissolving into freestanding sticks are discussed. CIE chromaticity coordinates were in the range of the orange-red to pure red. Drawbacks associated with the commercial powder dusting method for visualizing dormant fingerprint (DFP), namely, high background scattering and high autofluorescence of the substrate material, were improved with the help of the prepared SS as a dusting powder. Visualization of DFPs and sweat pores on various kinds of surfaces was studied effectively and systematically and revealed the well-defined first-, second-, and third-level ridge particulars with high contrast, high selectivity, and low background interference. These results suggest different strategies to engineer SS and highlights a method to obtain high-resolution DFPs. The prepared compounds are also utilized in antiforging ink and optoelectronics applications.

Interpol review of fingermarks and other body impressions 2016–2019

“…For ethical and health and safety reasons, this practice should be avoided at all costs. Similarly to the 2013–2016 report, we have taken the decision to cite these publications without describing their content further [ [257] , [258] , [259] , [260] , [261] , [262] , [263] , [264] , [265] , [266] , [267] , [268] , [269] , [270] , [271] , [272] , [273] , [274] , [275] , [276] , [277] , [278] , [279] , [280] , [281] , [282] , [283] , [284] , [285] , [286] , [287] , [288] , [289] , [290] , [291] , [292] , [293] , [294] , [295] , [296] , [297] , [298] , [299] , [300] , [301] , [302] , [303] , [304] , [305] , [306] , [307] , [308] , [309] , [310] , [311] ,…”

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

“…Generally, ridges, as well as valleys, are the most significant characteristics of the FPs. These characteristics were normally categorized into three levels 102 . They are, level-I features are the vein feature of the FPs, which comprise a central point, delta, whorl, loop, and arch, which were not enough for personal individualization.…”

Nanoparticles used for fingermark detection—A comprehensive review

“…In yet another publication by Saif et al, they synthesized La 2 Ti 2 O 7 :Eu 3+ @SiO 2 and used it to detect fresh fingermarks on various nonporous surfaces (Saif, Alsayed, Mbarek, El-Kemary, & Abdel-Mottaleb, 2016). Muniswamy et al synthesized Ti 3 O 3 :Eu@SiO 2 core-shell NPs that were nanosized when analysed by X-ray powder diffraction (XRD) but micron sized when analyzed by SEM (Muniswamy, Nagabhushana, Basavaraj, Darshan, & Prasad, 2018). Although the detection sensitivity of the nanopowders gradually decreased with increasing aging of the fingermarks, fingermarks up to 3 weeks old could be clearly visualized with high sensitivity.…”