Development of Latent Fingerprints using Nanoparticles

Abstract

In present work, latent fingerprints are developed using metal oxide nanoparticles. Metal Oxide (TiO2 & ZnO) nanoparticles synthesized by hydrothermal method and sol-gel method. XRD analysis was used to verify the size of nanoparticles. The XRD results showed the crystalline nature with 2θ peaks lying at 2θ=25.45° (101), 2θ=37.25° (004), 2θ= 47.59° (200), 2θ=53.35° (105) and 2θ=62.63°(204) for TiO2 nanoparticles and for ZnO nanoparticles the XRD results show the highest peak is at angle 36° In this study, Small Particle Reagent (SPR) formulation has been prepared using nanoparticles. Small particle regeant is a wet powder suspension which is applied on wet non-porous surfaces to develop the latent fingerprints. The 1g, 2g & 3g of TiO2 nanopartices and ZnO nanoparticles were added to prepare spr formulations. six formulaions with these three concentrations were prepared for two different tpyes of nanoparticle. In these formulations, SDS, distilled water and natural dye (curcumin powder also added). These six formulations applied on the fresh glass slides and adhesive side of electric tape. Varying the concentration of nanoparticles effects the development rate of latent fingerprints. The results showed that the increase in concentration of nanoparticles decreases the visibility of developed latent fingerprints. But results of developed latent fingerprints with TiO2 nanoparticles were good as compared to developed results of ZnO nanoparticles.