Navigation Links
Motorola researchers develop selective sensors based on carbon nanotubes

A team of researchers from Arizona State University and Motorola Labs, the applied research arm of Motorola Inc., has developed sensors based on carbon nanotubes, microscopically small structures that posses excellent electronic properties. In early tests, the new devices detected the presence of heavy metal ions in water down to parts per trillion levels.

Specifically, the researchers developed a method for applying peptides to single walled carbon nanotubes (SWNT) in field effect transistors.

"This is a fairly general sensor platform for all kinds of applications," said Nongjian Tao, an electrical engineering professor at Arizona State University and one of the researchers on the project. "We tested heavy metal ions in water, but the platform can be applied to many other areas to sense toxic chemicals in the air, or they can be used as biosensors when applied to medicine."

"Integration of nanosensors into devices and sensor networks will enable the detection of biological and chemical agents at very low concentrations, which could be vital in the areas of public safety and homeland security," added Vida Ilderem, vice president of the Embedded Systems Research Labs at Motorola, Tempe, Ariz.

The researchers report the advance in a paper, "Tuning the chemical selectivity of SWNT-FETs for detection of heavy metal ions," which will be published in the journal Small. An early view of the article is available at the journal's web site (www3.interscience.wiley.com/cgi-bin/jissue/109627347).

"Our sensor is based on the novel properties of peptides and carbon nanotubes," Tao explained. "Peptides can be used to recognize and detect various chemical species with high sensitivity and selectivity while carbon nanotubes are well known for their electronic properties."

The peptides are made of 20 or so amino acids, so changing the sequence of amino aci ds allows the researchers to "tune the peptides and recognize different compounds," Tao said. "We developed a simple way to attach different peptides to different nanotubes."

Erica Forzani, an ASU assistant research professor in electrical engineering, said the peptides are selective to specific compounds. In the heavy metal tests, the researchers developed a peptide to detect nickel and one to detect copper. If the nickel peptide were used, it would only detect the presence of nickel and be "blind" to any other heavy metal ion (copper, lead or zinc) passing over the carbon nanotubes.

Tao added it's the combination of the structure of the nanotubes and the selectivity of the peptides that make the devices so powerful.

"The nanotubes basically are a sheet of interconnected atoms rolled into a tube," Tao said. "Every single atom in the tube is exposed to the environment and can interact with chemicals and molecules. That is why it is so sensitive. But without the peptides, it would not recognize specific compounds."

"The potential for the carbon nanotubes is extraordinary," Forzani added, "because with a very simple device that does not require sophisticated electronic circuitry, you can detect very low concentrations of analytes."

The researchers now will investigate the use of the sensors on biological molecules, like RNA sequence detection, Tao and Forzani said.
'"/>

Source:Arizona State University


Related biology news :

1. NYU researchers simulate molecular biological clock
2. Vital step in cellular migration described by UCSD medical researchers
3. ASU researchers finds novel chemistry at work to provide parrots vibrant red colors
4. UCSD researchers maintain stem cells without contaminated animal feeder layers
5. Why do insects stop breathing? To avoid damage from too much oxygen, say researchers
6. New protein discovered by Hebrew University researchers
7. First real-time view of developing neurons reveals surprises, say Stanford researchers
8. Agilent Technologies releases automated literature search tool for biology researchers
9. Self-assembled nano-sized probes allow Penn researchers to see tumors through flesh and skin
10. Yale researchers identify molecule for detecting parasitic infection in humans
11. US life expectancy about to decline, researchers say

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/30/2017)... -- On April 6-7, 2017, Sequencing.com will host the world,s ... at Microsoft,s headquarters in Redmond, Washington ... health and wellness apps that provide a unique, personalized ... is the first hackathon for personal genomics and the ... the genomics, tech and health industries are sending teams ...
(Date:3/28/2017)... , March 28, 2017 ... Biometrics), Hardware (Camera, Monitors, Servers, Storage Devices), Software (Video ... and Region - Global Forecast to 2022", published by ... in 2016 and is projected to reach USD 75.64 ... 2017 and 2022. The base year considered for the ...
(Date:3/23/2017)... The report "Gesture Recognition and Touchless Sensing Market by Technology (Touch-based ... to 2022", published by MarketsandMarkets, the market is expected to be worth USD ... 2022. Continue Reading ... ... ...
Breaking Biology News(10 mins):
(Date:5/16/2017)... ... 16, 2017 , ... Zansors has secured a patent ... or EKG) acquisition and monitoring device. This Zansors’ next-generation intellectual property (IP), will ... the skin, making them significantly easier to deploy and use. , Currently, ECG ...
(Date:5/16/2017)... (UK) , ... (PRWEB) May ... ... Annual Congress of the Chinese Association of Orthopaedic Surgeons (CAOS), long-standing development ... Medical") collaborated on an interbody spine surgery workshop to help expand knowledge ...
(Date:5/15/2017)... ... 15, 2017 , ... Catalent Pharma Solutions, the leading global ... health products, today announced that it has signed an agreement with Therachon AG, ... clinical development of TA-46, a novel protein addressing achondroplasia, which is the most ...
(Date:5/15/2017)... -- IBM (NYSE: IBM ) scientists have developed ... molecules with the potential to efficiently reveal biomarkers ... complements the IBM Research,s "lab-on-a-chip" nanoDLD technology ... which may also contain biomarkers for disease detection. ... diamond shaped micropillars 1 to pre-stretch DNA ...
Breaking Biology Technology: