Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Silkmoth inspires novel explosive detector

© Fabien Schnell/NS3E Overall view of a microcantilever nanostructured by aligned titanium dioxide nanotubes.
© Fabien Schnell/NS3E

Overall view of a microcantilever nanostructured by aligned titanium dioxide nanotubes.

Abstract:
Imitating the antennas of the silkmoth, Bombyx mori, to design a system for detecting explosives with unparalleled performance is the feat achieved by a team from the "Nanomatériaux pour Systèmes sous Sollicitations Extrêmes" unit (CNRS / Institut Franco-Allemand de Recherches de Saint-Louis), in collaboration with the Laboratoire des Matériaux, Surfaces et Procédés pour la Catalyse (CNRS / Université de Strasbourg). Made up of a silicon microcantilever bearing nearly 500,000 aligned titanium dioxide nanotubes, this device is capable of detecting concentrations of trinitrotoluene (TNT) of around 800 ppq (1) (i.e. 800 molecules of explosive per 10^15 molecules of air), thereby improving one thousand-fold the detection limit attainable until now. This innovative concept could also be used to detect drugs, toxic agents and traces of organic pollutants. This work is published on 29 May 2012 in the journal Angewandte Chemie.

Silkmoth inspires novel explosive detector

Paris, France | Posted on June 2nd, 2012

The efficient detection of explosives such as trinitrotoluene (TNT) represents a difficult challenge in terms of security. Indeed, these compounds have very low volatility and it takes extremely sensitive sensors to detect them at a distance. Current systems detect concentrations of around 1 ppb (2) (one molecule per 10^9 molecules of air), but this level of performance can be insufficient to ensure airport security for example. Yet, numerous animals have a sense of smell that can go well below this limit including, for example, the silkmoth (Bombyx mori), capable of reacting to the capture of just a few pheromone molecules. Its antennas are composed of strands of around one millimeter in length, bearing a large of number of sensilla, micrometric sized organs directly connected to the sensory neurons. It is this structure that the researchers sought to imitate.

The system that they have developed comprises a 200-micron long and 30-micron wide silicon microcantilever. This support has been nanostructured with around 500,000 vertically aligned titanium dioxide nanotubes. The role of these nanostructures is to multiply the surface area of the microcantilever by a factor of around one hundred and to proportionally increase the chances of capturing the molecules being searched for. By making the microcantilever vibrate, it is possible to determine whether the ambient air contains traces of TNT and if these molecules have been captured by the device. In fact, the microcantilever has a particular resonance frequency that is modified in a specific manner when it absorbs molecules of explosive.

To test the performance of this device, the researchers released very small quantities of TNT in a controlled manner. In this way, there were able to establish that the sensitivity of the device was 800 ppq (800 molecules per million billion molecules (10^15)). No current device is able to detect such low concentrations of explosives. These performance levels are similar to those of trained sniffer dogs.

Research and development work is still necessary before an easy-to-use device based on these nanostructured levers can be obtained. One of the next steps is to design a device capable of specifically recognizing the type of explosive absorbed. The scientists already hope to adapt these microcantilevers to the detection of other explosives, such as pentrite, which could pose security problems in Europe. Furthermore, this method could also be used to detect various drugs which, like explosives, have very low volatility. In environmental terms, this bio-inspired device could make it possible to measure infinitesimal traces of pollutants such as volatile organic compounds, which have become a major health issue.

1) Ppq (parts per quadrillion) is used to measure the abundance of an element.
2) Ppb (parts per billion) represents a concentration of around 10^-9.

Full bibliographic informationBio-Inspired Nanostructured Sensor for the Detection of Ultralow Concentrations of Explosives. D. Spitzer, T. Cottineau, N. Piazzon, S. Josset, F. Schnell, S. N. Pronkin, E. R. Savinova, and V. Keller. Angewandte Chemie. 29 mai 2012.

####

For more information, please click here

Contacts:
Researchers
Denis Spitzer
T +33 (0)3 89 69 50 75


Valérie Keller
T +33 (0)3 68 85 27 36


CNRS press officer
Priscilla Dacher
T +33 (0)1 44 96 46 06 l

Julien Guillaume
+ 33 1 44 96 51 51

Copyright © AlphaGalileo

If you have a comment, please Contact us.

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

Iranian Researchers Synthesize Stable Ceramic Nanopowders at Room Temperature September 20th, 2014

Arrowhead to Present at BioCentury's NewsMakers in the Biotech Industry Conference September 19th, 2014

SouthWest NanoTechnologies (SWeNT) Receives NIST Small Business Innovation Research (SBIR) Phase 1 Award to Produce Greater than 99% Semiconducting Single-Wall Carbon Nanotubes September 19th, 2014

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

Discoveries

Iranian Scientists Separate Zinc Ion at Low Concentrations September 20th, 2014

Iranian Researchers Synthesize Stable Ceramic Nanopowders at Room Temperature September 20th, 2014

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

New research points to graphene as a flexible, low-cost touchscreen solution September 19th, 2014

Announcements

Iranian Scientists Separate Zinc Ion at Low Concentrations September 20th, 2014

Arrowhead to Present at BioCentury's NewsMakers in the Biotech Industry Conference September 19th, 2014

SouthWest NanoTechnologies (SWeNT) Receives NIST Small Business Innovation Research (SBIR) Phase 1 Award to Produce Greater than 99% Semiconducting Single-Wall Carbon Nanotubes September 19th, 2014

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

Homeland Security

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

Nano-sized Chip "Sniffs Out" Explosives Far Better than Trained Dogs: TAU researcher's groundbreaking sensor detects miniscule concentrations of hazardous materials in the air July 23rd, 2014

Military

Scientists refine formula for nanotube types: Rice University theorists determine factors that give tubes their chiral angles September 17th, 2014

Nanoribbon film keeps glass ice-free: Rice University lab refines deicing film that allows radio frequencies to pass September 16th, 2014

'Squid skin' metamaterials project yields vivid color display: Rice lab creates RGB color display technology with aluminum nanorods September 15th, 2014

Fonon at Cutting-Edge of 3D Military Printing: Live-Combat Scenarios Could See a Decisive Advantage with 3D Printing September 15th, 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