Medindia

X

Clearer Fingerprints Even on Wet Surfaces Possible With Nano-Zinc

by Rajashri on  July 7, 2008 at 3:14 PM News on IT in Healthcare   - G J E 4
 Clearer Fingerprints Even on Wet Surfaces Possible With Nano-Zinc
Detectives may be able to obtain a clear set of fingerprints even on wet surfaces by using a powder made up of zinc oxide nanoparticles, Australian researchers are suggesting.
Advertisement

Dr Andrew McDonagh, an expert with the Centre for Forensic Science at the University of Technology, Sydney (UTS), says that traditional powder reveals fingerprints by sticking to the oily residues left on the surface, but this does not always work.

Advertisement
He points out that it often becomes hard for investigators to obtain fingerprints on wet surfaces such as sinks or bath tubs, especially when part of the print has been washed away.

McDonagh says that he and his colleagues worked in collaboration with the Australian Federal Police, and tested a new fingerprint powder based on zinc oxide nanoparticles on surfaces such as glass, polyethylene and aluminium.

According to him, the 20-nanometre zinc oxide particles clump together in one micrometre sized flower-like crystals, much smaller than the current 10 micrometre fingerprint powder particles.

He said that illuminating the nanoparticles with ultraviolet light caused them to fluoresce without the addition of any fluorescent dyes.

The research team observed that the zinc oxide nanoparticle powder gave a much clearer picture of the fingerprints, compared to conventional powders.

"When you dust with a powder, you're hoping that it will stick only to the fingerprint, but often it will stick to everything," ABC Online quoted McDonagh as saying.

"(The nanoparticles are) very good at sticking to the fingerprint residue but not to the background surface," he added.

The researchers said that the system worked exceptionally well in wet conditions.

When they immersed the material with fingerprints into a solution of the nanoparticles, it delivered very clear prints.

Source: ANI
RAS/L
Advertisement

Post your Comments

Comments should be on the topic and should not be abusive. The editorial team reserves the right to review and moderate the comments posted on the site.
User Avatar
* Your comment can be maximum of 2500 characters
Notify me when reply is posted I agree to the terms and conditions

You May Also Like

Advertisement
View All