Select your localized edition:

Close ×

More Ways to Connect

Discover one of our 28 local entrepreneurial communities »

Be the first to know as we launch in new countries and markets around the globe.

Interested in bringing MIT Technology Review to your local market?

MIT Technology ReviewMIT Technology Review - logo


Unsupported browser: Your browser does not meet modern web standards. See how it scores »

{ action.text }

A nanowire sensor made by researchers at Tel Aviv University can detect extremely small traces of commonly used explosives in liquid or air in a few seconds. The device is a thousand times more sensitive than the current gold standard in explosives detection: the sniffer dog.

The sensor could be cheaply produced and incorporated into a handheld instrument for detecting buried landmines or concealed explosives at security checkpoints, according to Fernando Patolsky, a chemistry professor who led the work, which was published in the journal Angewandte Chemie last week. The researchers are developing a portable instrument based on the technology. Their first prototype is about the size of a brick. “We could put the sensors everywhere in an airport, in every corner of a shopping mall,” Patolsky says.

Trained dogs have historically been used to sniff out bombs and landmines because they can smell explosives at concentrations of just a few parts per billion. But it takes tens of thousands of dollars to train and maintain a sniffer dog, so handheld detectors promise a cheaper and more portable solution.

The nanowire array isn’t the first device to achieve canine levels of explosive-sniffing sensitivity. A system developed by ICx Technologies, based in Arlington, Virginia, can detect vapors given off by explosives with a sensitivity matching that of a canine nose. Instead of nanowires, the ICx system uses polymers that glow or stop glowing in response to traces of explosive in a vapor in a few seconds. This device is being used in battlefields in Iraq and Afghanistan, and the U.S. Transportation Security Administration recently started using it at airports, but most airports still rely on microwave oven-sized instruments that take minutes, rather than seconds, to detect explosives in swabs taken from luggage or passengers’ skin.

The new Tel Aviv University device is a thousand times more sensitive than any existing detector, including the ICx device. The researchers have used it to detect TNT and the plastic explosives RDX and PETN at concentrations lower than one part per trillion in a few seconds.

6 comments. Share your thoughts »

Credit: Fernando Patolsky, Tel Aviv University

Tagged: Computing, Materials, military, nanowires, explosives, chemical sensors, silicon nanowires

Reprints and Permissions | Send feedback to the editor

From the Archives


Introducing MIT Technology Review Insider.

Already a Magazine subscriber?

You're automatically an Insider. It's easy to activate or upgrade your account.

Activate Your Account

Become an Insider

It's the new way to subscribe. Get even more of the tech news, research, and discoveries you crave.

Sign Up

Learn More

Find out why MIT Technology Review Insider is for you and explore your options.

Show Me