Abstract
SnO2:Eu3+ 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.
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