Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

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 3ìm 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

Thanks for the memory: NIST takes a deep look at memristors January 20th, 2018

New Method Uses DNA, Nanoparticles and Top-Down Lithography to Make Optically Active Structures: Technique could lead to new classes of materials that can bend light, such as for those used in cloaking devices January 18th, 2018

Arrowhead Pharmaceuticals Announces Pricing of Underwritten Public Offering of Common Stock January 18th, 2018

Leti to Demo New Curving Technology at Photonics West that Improves Performance of Optical Components January 18th, 2018

Products

STMicroelectronics Peps Up Booming Social-Fitness Scene with Smart Motion Sensors for Better Accuracy, Longer Battery Life, and Faster Time to Market January 2nd, 2017

Cutting-edge nanotechnologies are breaking into industries November 18th, 2016

STMicroelectronics’ Semiconductor Chips Contribute to Connected Toothbrush from Oral-B That Sees What You Don’t: Microcontroller and Accelerometer help brushers clean their teeth more effectively October 4th, 2016

Particle Works launches range of high quality magnetic nanoparticles August 31st, 2016

Academic/Education

Luleå University of Technology is using the Deben CT5000TEC stage to perform x-ray microtomography experiments with the ZEISS Xradia 510 Versa to understand deformation and strain inside inhomogeneous materials November 7th, 2017

Park Systems Announces the Grand Opening of the Park NanoScience Center at SUNY Polytechnic Institute November 3rd, 2017

Two Scientists Receive Grants to Develop New Materials: Chad Mirkin and Monica Olvera de la Cruz recognized by Sherman Fairchild Foundation August 16th, 2017

Moving at the Speed of Light: University of Arizona selected for high-impact, industrial demonstration of new integrated photonic cryogenic datalink for focal plane arrays: Program is major milestone for AIM Photonics August 10th, 2017

Sensors

Leti to Demo New Curving Technology at Photonics West that Improves Performance of Optical Components January 18th, 2018

NRL improves optical efficiency in nanophotonic devices January 4th, 2018

'Quantum material' has shark-like ability to detect small electrical signals December 20th, 2017

Record high photoconductivity for new metal-organic framework material December 15th, 2017

Announcements

Thanks for the memory: NIST takes a deep look at memristors January 20th, 2018

New Method Uses DNA, Nanoparticles and Top-Down Lithography to Make Optically Active Structures: Technique could lead to new classes of materials that can bend light, such as for those used in cloaking devices January 18th, 2018

Arrowhead Pharmaceuticals Announces Pricing of Underwritten Public Offering of Common Stock January 18th, 2018

Leti to Demo New Curving Technology at Photonics West that Improves Performance of Optical Components January 18th, 2018

Environment

Rice U.'s one-step catalyst turns nitrates into water and air: NSF-funded NEWT Center aims for catalytic converter for nitrate-polluted water January 5th, 2018

'Quantum material' has shark-like ability to detect small electrical signals December 20th, 2017

Silicon Sense first to achieve EPA approval to import detonation nanodiamonds to US: Nanodiamond additives can significantly improve the performance of metal finishing, polymer thermal and mechanical compounds, polymer coatings, CMP polishing and a range of other applications November 29th, 2017

Report highlights opportunities and risks associated with synthetic biology and bioengineering November 22nd, 2017

Automotive/Transportation

Ultrathin black phosphorus for solar-driven hydrogen economy: Osaka University researchers use sunlight to make hydrogen with a new nanostructured catalyst based on nanosheets of black phosphorus and bismuth vanadate January 17th, 2018

New catalyst for hydrogen production is a step toward clean fuel: Carbon-based nanocomposite with embedded metal ions yields impressive performance as catalyst for electrolysis of water to generate hydrogen January 16th, 2018

STMicroelectronics Selects GLOBALFOUNDRIES 22FDX® to Extend Its FD-SOI Platform and Technology Leadership : GF’s FDX technology will enable ST to deliver high-performance, low-power products for next-generation consumer and industrial applications January 9th, 2018

Study boosts hope for cheaper fuel cells: Rice University researchers show how to optimize nanomaterials for fuel-cell cathodes January 6th, 2018

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