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.
SnO 2 :Eu 3+ nanopowders were prepared by biofriendly hydrothermal method using Aloe Vera gel as a biotemplate. Prepared samples were characterized for their structural, morphological, and optical properties using powder X-ray diffraction, scanning/transmission electron microscopies, and diffused reflectance spectroscopy. Morphology shows the layered structures with sharp edges confirms the system with better surface area along with sticky nature. Energy band gap of the samples varies from 3.44 to 3.74 eV. Photoluminescence results showed the dipolar−dipolar interactions and led to red light emission when excited with 392 nm excitation wavelength. Optimized compounds were explored for their feasibility to visualize well-preserved latent fingerprints on the various types of surfaces. Visualized fingerprints show the details of third-level ridges, bifurcations, and pores with high selectivity, better contrast, and without background hindrance. Clarity of developed fingerprints was also examined under aquatic environment and abrasion test. Even severe environmental conditions demonstrated successfully the robustness and supremacy of the present approach. It is anticipated that the present nanostructures could be used in the visualization of LFTs and its utility for various forensic and optoelectronic applications.
Thin films of the polymer, polyvinylpyloridate, reinforced with zinc-nickel ferrite nanoparticles (Zn0.5Ni0.5Fe2O4) and prepared using the technique of spin coating is the central theme of presentation and discussion in this research paper. The zinc-nickel ferrite nanoparticles were used to reinforce a thin film of the chosen polymer and for varying concentrations. The prepared thin films were transparent and consequently studied for the purpose of selection and use in applications specific to the domain of photonics. Optical characterization of samples of the as-synthesized thin films was done using different spectroscopy techniques. Optical density of the as-prepared thin films was obtained using a ultra-violet (UV) spectrophotometer. The reinforcing effect was observed from the emission spectra that was obtained using the fluorescence spectrophotometer. Also, Fourier transform infrared spectroscopy (FTIR) of the reinforced thin films of the chosen polymer was obtained and compared with the unreinforced pure polymer and did reveal an observable change in both the peak value and intensity of the peak. X-ray diffraction (XRD) analysis revealed a noticeable difference in both intensity and crystallization of the thin films of the reinforced polymer. Scanning electron microscopy observations revealed a morphological change of the thin films. Roughness of the sample surface was studied with the help of images obtained from an atomic force microscope (AFM). The present research study technique of spin coating was done properly and successfully. With a gradual increase in the number of reinforcing nanoparticles in the polymer matrix we did observe an increase in Optical Density using UV-Visible spectroscopy. An increase in the Optical Density is beneficial for attaining an improvement in anti-reflection response. This study helped establish the effect of nanoparticle reinforcements on optical properties while concurrently establishing the need for selection and use of thin films for applications in the field of photonics.
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