Home > News > Fingerprints revealed by nanotechnology
March 12th, 2007
Fingerprints revealed by nanotechnology
Hidden fingerprints can now be revealed quickly and reliably thanks to two developments in nanotechnology.
The current way of revealing hidden prints involves coating the marked surface with a watery suspension of gold nanoparticles, stabilised by citrate ions. Under acid conditions, the gold particles stick to the positively-charged molecules in the fingerprint. The print is then developed with a solution of silver ions, which undergo a chemical reaction to leave an outline of dark silver metal along the characteristic ridges of the fingerprint. But the gold solution is quite unstable, and the technique is difficult to reproduce from one test to another.
Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers
Creation of 'Rocker' protein opens way for new smart molecules in medicine, other fields December 18th, 2014
How does enzymatic pretreatment affect the nanostructure and reaction space of lignocellulosic biomass? December 18th, 2014
Iranian Scientists Use Nanotechnology to Increase Power, Energy of Supercapacitors December 18th, 2014
Iranian Researchers Produce Electrical Pieces Usable in Human Body December 18th, 2014
Longhorn beetle inspires ink to fight counterfeiting November 5th, 2014
Iran-Made Respiratory Nano Masks Provided to Hajj Pilgrims October 23rd, 2014
Japanese gold leaf artists worked on a nano-scale: Study demonstrates X-ray fluorescence spectroscopy is a non-destructive way to date artwork July 3rd, 2014
Harry Potter-style invisibility cloaks: A real possibility next Christmas? Forget socks and shaving foam, the big kids of tomorrow want an invisible cloak for Christmas December 19th, 2013