Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > NO2 gas sensor based on vertically-grown InAs nanowires

Figure gassensor: Artist impression of the NO2 gas sensor, showing the contacts and InAs nanowires
Figure gassensor: Artist impression of the NO2 gas sensor, showing the contacts and InAs nanowires

Abstract:
Imec and Holst Centre have developed an innovative sensor for measuring ultra-low concentrations of NO2. Such sensors are important for applications that monitor environmental pollution resulting from traffic, and in general, from all combustion motors. The sensor's active components are arrays of grown vertical InAs nanowires. A typical sensor would contain 500 such nanowires, and will be sensitive to NO2 concentrations of fewer than 100ppb at room temperature.

NO2 gas sensor based on vertically-grown InAs nanowires

Leuven, Belgium | Posted on December 18th, 2010

The sensor's nanowires are about 3m in length and 50-100nm wide. They are made from InAs, which is well-suited for gas sensing, because it has an electron accumulation layer at the surface, making it sensitive to accumulated charges. Gas molecules adsorb onto the nanowires, changing the current that is flowing through the nanowires.

The semiconductor nanowires are contacted ohmically using an air bridge construction (see picture). This construction has as advantage that it leaves the nanowire surface free for gas adsorption. Because of the small bandgap of InAs, it's fairly easy to fabricate these ohmic contacts. The sensor can be reset, simply by applying a stronger current.

The new sensor boasts several breakthroughs in nanowire technology. A key characteristic is that the vertical nanowires are electrically contacted in the locations on the substrate where they are grown. In other, comparable nanowire sensors, the nanowires have to be placed on the substrate after being grown elsewhere. Another major benefit of these sensing nanowires is that they function without heating, making them much more power-efficient.

The new gas sensor has been developed in Holst Centre's program for ultra-low-power sensors. In a next step, the researchers will increase the sensitivity of the sensor, as well as its detection selectivity. One goal is, for example, to make a sensor that can distinguish between NO2 and NO. Also, new manufacturing techniques are investigated, with the aim to use cost-effective silicon substrates for high-yield solutions.

####

About imec
Imec performs world-leading research in nanoelectronics. Imec leverages its scientific knowledge with the innovative power of its global partnerships in ICT, healthcare and energy. Imec delivers industry-relevant technology solutions. In a unique high-tech environment, its international top talent is committed to providing the building blocks for a better life in a sustainable society.

Imec is headquartered in Leuven, Belgium, and has offices in Belgium, the Netherlands, Taiwan, US, China and Japan. Its staff of more than 1,750 people includes over 550 industrial residents and guest researchers. In 2009, imec's revenue (P&L) was 275 million euro.

Imec is a registered trademark for the activities of IMEC International (a legal entity set up under Belgian law as a "stichting van openbaar nut), imec Belgium (imec vzw supported by the Flemish Government), imec the Netherlands (Stichting imec Nederland, part of Holst Centre which is supported by the Dutch Government), imec Taiwan (imec Taiwan Co.). and imec China (IMEC Microelectronics (Shangai) Co. Ltd.).

For more information, please click here

Contacts:
Imec:
Katrien Marent
Director of External Communications
T: +32 16 28 18 80
M: +32 474 30 28 66


For Imec:
Barbara Kalkis
Maestro Marketing & PR
T: +1 408 996 9975
M: +1 408 529 4210

Copyright © imec

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

UK NANOSAFETY GROUP publishes 2nd Edition of guidance to support safe working with nanomaterials May 30th, 2016

Fast, stretchy circuits could yield new wave of wearable electronics May 30th, 2016

Automating DNA origami opens door to many new uses: Like 3-D printing did for larger objects, method makes it easy to build nanoparticles out of DNA May 30th, 2016

Simple attraction: Researchers control protein release from nanoparticles without encapsulation: U of T Engineering discovery stands to improve reliability and fabrication process for treatments to conditions such as spinal cord damage and stroke May 28th, 2016

Products

Oxford Nanoimaging to provide desktop super-resolution microscopes May 10th, 2016

Abalonyx launches Reduced Graphene Oxide Product: Abalonyx has successfully scaled up production of thermally reduced graphene oxide (rGO) in its Tofte, Norway, production facility. This product is now offered to customers in Kg-quantities May 10th, 2016

New Generation of Graphene Reinforced Carbon Fibre Prepreg Products March 14th, 2016

New Generation of Graphene Reinforced Carbon Fibre Prepreg Products March 10th, 2016

Academic/Education

Graphene: Progress, not quantum leaps May 23rd, 2016

Smithsonian Science Education Center and National Space Society Team Up for Next-Generation Space Education Program "Enterprise In Space" May 11th, 2016

The University of Colorado Boulder, USA, combines Raman spectroscopy and nanoindentation for improved materials characterisation May 9th, 2016

Albertan Science Lab Opens in India May 7th, 2016

Sensors

The next generation of carbon monoxide nanosensors May 26th, 2016

Dartmouth team creates new method to control quantum systems May 24th, 2016

Electronic device detects molecules linked to cancer, Alzheimer's and Parkinson's: An inexpensive portable biosensor has been developed by researchers at Brazil's National Nanotechnology Laboratory with FAPESP's support May 20th, 2016

Making organs transparent to improve nanomedicine (video) May 13th, 2016

Announcements

UK NANOSAFETY GROUP publishes 2nd Edition of guidance to support safe working with nanomaterials May 30th, 2016

Fast, stretchy circuits could yield new wave of wearable electronics May 30th, 2016

Automating DNA origami opens door to many new uses: Like 3-D printing did for larger objects, method makes it easy to build nanoparticles out of DNA May 30th, 2016

Simple attraction: Researchers control protein release from nanoparticles without encapsulation: U of T Engineering discovery stands to improve reliability and fabrication process for treatments to conditions such as spinal cord damage and stroke May 28th, 2016

Environment

The next generation of carbon monoxide nanosensors May 26th, 2016

Novel functionalized nanomaterials for CO2 capture May 10th, 2016

First single-enzyme method to produce quantum dots revealed: Biological manufacturing process, pioneered by three Lehigh University engineers, produces equivalent quantum dots to those made chemically--but in a much greener, cheaper way May 9th, 2016

Los Alamos National Laboratory Expands Scope to Locus Technologies SaaS Contract: Los Alamos National Laboratory Adds Two New Applications to Locus SaaS Platform May 7th, 2016

Automotive/Transportation

Technique improves the efficacy of fuel cells: Research demonstrates a new phase transition from metal to ionic conductor May 18th, 2016

A View Through Wood Shows Futuristic Applications: Transparent wood made at UMD could create new windows, cars and solar panels May 5th, 2016

Speedy ion conduction in solid electrolytes clears road for advanced energy devices May 5th, 2016

New spin Seebeck thermoelectric device with higher conversion efficiency created April 26th, 2016

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







Car Brands
Buy website traffic