Histidine decorated Magnetite Nanoparticles for the latent fingerprint enhancement on broad range of surfaces

In the recent era nanotechnology takes an attention due to various applications in broad area of science and technology. However, the use of different nano particles for fingerprint enhancement gives very rapid, notable and promising result. Among all, Magnetic Nanoparticles (MNPs) receiving increasing attention in physical, biological, material and forensic sciences due to their multifunctional properties such as small size, super magnetism and biocompatibility. herein, the latent fingerprints are developed by using Histidine functionalized MNPs (His@MNPS) as a fingerprint enhancing agent. His@MNPs are synthesised using in situ wet chemical method and characterized using XRD, FTIR, HR-TEM & SEM. Due to Imidazole group on the surface of His@MNPs, it gives rapid and peculiar fingerprint enhancement. Additionally, Synthesised nanomaterial is efficient on most of the surfaces, like hard-surfaces, soft-surfaces, porous and non-porous surfaces. However, His@MNPs have affinity to bind with Negatively charged component which gives enchantment to latent fingerprint. The interaction between positively charged Amine and negatively charged fingerprint surface developed print which is seen by necked eye as well as in the range of UV radiation around 350- 390 nm. This work may open up other potential application of HiS@MNPs in preventive and detective forensics.

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