Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Gas, gas, quick boys

Abstract:
TERRORISM is most commonly associated with the bomb and the bullet, but ever since an incident on the Tokyo subway system in 1995, the security services have also had to worry about poison gas.

That attack, which used a nerve-gas called sarin, killed 12 people and severely injured another 50. Sarin is to be feared because it is invisible, odourless and 500 times more deadly than cyanide. However, other gases (not least cyanide itself) could be used instead. What is needed is a cheap way of detecting such gases and, having raised the alarm, of identifying which gas is involved so that anyone who has succumbed can be treated.

And that is what a team of chemical engineers at the Massachusetts Institute of Technology, led by Michael Strano (pictured on the left), think they have created. Not only can their new sensor tell between chemical agents, it can detect them at previously unattainable concentrations—as low as 25 parts in a trillion.

The core of Dr Strano's invention, which he describes in Angewandte Chemie, is an array of treated carbon nanotubes. Each is, in essence, a layer of carbon atoms that has been coated with nitrogen-containing molecules called amines and rolled into a cylinder with the amines on the outside. Individual tubes, which are about 1/50,000 of the width of a human hair in diameter, are arranged so that they run between pairs of tiny electrodes. When the device is switched on the nanotubes carry an electric current with a power of about 300 microwatts.

The gases to be analysed reach the nanotubes through a miniature column etched onto a silicon chip. As they pass along this column they tend to stick to its sides. Some gases stick more than others, and hence travel more slowly down the column. In this way the components of the sample separate from one another. Each component is puffed onto the nanotubes, where it sticks to the carbon atoms. This, in turn, causes the conductivity of the nanotubes to change—how much is a characteristic of each gas.


Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Imaging electric charge propagating along microbial nanowires October 20th, 2014

Design of micro and nanoparticles to improve treatments for Alzheimers and Parkinsons: At the Faculty of Pharmacy of the UPV/EHU-University of the Basque Country encapsulation techniques are being developed to deliver correctly and effectively certain drugs October 20th, 2014

Physicists build reversible laser tractor beam October 20th, 2014

Removal of Limitations of Composites at Superheat Temperatures October 20th, 2014

Sensors

Imaging electric charge propagating along microbial nanowires October 20th, 2014

Graphenea opens US branch October 16th, 2014

IRLYNX and CEA-Leti to Streamline New CMOS-based Infrared Sensing Modules Dedicated to Human-activities Characterization October 15th, 2014

Nanodevices for clinical diagnostic with potential for the international market: The development is based on optical principles and provides precision and allows saving vital time for the patient October 15th, 2014

Announcements

Imaging electric charge propagating along microbial nanowires October 20th, 2014

Design of micro and nanoparticles to improve treatments for Alzheimers and Parkinsons: At the Faculty of Pharmacy of the UPV/EHU-University of the Basque Country encapsulation techniques are being developed to deliver correctly and effectively certain drugs October 20th, 2014

Physicists build reversible laser tractor beam October 20th, 2014

Removal of Limitations of Composites at Superheat Temperatures October 20th, 2014

Homeland Security

UT Arlington researchers develop transparent nanoscintillators for radiation detection for medical safety and homeland security September 29th, 2014

Seeking Nanoscale Defenses for Biological and Chemical Threats: WPI co-organizes a NATO workshop to improve the detection and decontamination of biological and chemical agents September 13th, 2014

Watching Schrödinger's cat die (or come to life): Steering quantum evolution & using probes to conduct continuous error correction in quantum computers July 30th, 2014

Production of Toxic Gas Sensor Based on Nanorods July 28th, 2014

NanoNews-Digest
The latest news from around the world, FREE





  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE