Navigation Links
Researchers use graphene quantum dots to detect humidity and pressure
Date:5/8/2013

ading the currents one can tell the humidity in the environment."

Decreasing the distance between the graphene quantum dots by 0.35 nanometers increased the device's conductivity by 43-fold, Berry said. Furthermore, because air contains water, reducing air pressure decreased its water content and caused the graphene quantum dots to get closer together, which increased conductivity. Quantum mechanics suggests that electrons have a finite probability to tunnel from an electrode to a nonconnected electrode, Berry said. This probability is inversely and exponentially proportional to the tunneling distance, or the gap between the electrodes.

The research has numerous applications, particularly in improving sensors for humidity, pressure or temperature.

"These devices are unique because, unlike most humidity sensors, these are more responsive in vacuum," Berry said. "For example, these devices can be incorporated into space shuttles, where low humidity measurements are required. These sensors might also be able to detect trace amounts of water on Mars, which has 1/100th of the earth's atmospheric pressure. This is because the device measures humidity at a much higher resolution in vacuum."

While the heart of the device is the modulation of electron tunneling, the response of the device is through the polymer microfiber, Berry said. His team also is looking at changing the polymer to find other applications for this research.

"If you replace this polymer with a polymer that is responsive to other stimuli, you can make a different kind of sensor," Berry said. "I envision this project to have a broad impact on sensing."

The research is supported by Berry's five-year, $400,000 National Science Foundation CAREER award. The research results appear in a recent issue of the journal Nano Letters in an article titled "Electron-tunneling modulation in percolating-network of graphene quantum dots: fabrication, phenomenologi
'/>"/>

Contact: Vikas Berry
vberry@k-state.edu
785-532-5519
Kansas State University
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Researchers reveal new more precise method of performing electroconvulsive therapy
2. Researchers calculate the global highways of invasive marine species
3. University of Maryland School of Medicine researchers find potential novel treatment for influenza
4. Researchers pinpoint upper safe limit of vitamin D blood levels
5. Researchers track singing humpback whales on a Northwest Atlantic feeding ground
6. Huddersfield researchers publish a book exploring the link between evolution and criminal behavior
7. Researchers pinpoint how trees play role in smog production
8. CNIO researchers capture the replication of the human genome for the first time
9. Researchers abuzz over caffeine as cancer-cell killer
10. An important discovery in breast cancer by IRCM researchers
11. UCLA researchers find nanodiamonds could improve effectiveness of breast cancer treatment
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/24/2014)... NJIT this week for an all-day public forum on ... Agency (EPA) to dredge toxic sediment from an eight-mile ... has called the plan, which proposes removing 4.3 million ... the riverbed, one of the largest cleanups in the ... disposed off-site. , "We need to ensure the future ...
(Date:7/24/2014)... BRUNSWICK, N.J. A yearlong study funded by the ... the Edward J. Bloustein School of Planning and Public ... owners in Sandy-affected towns are skeptical about the likelihood ... online survey respondents, 45 percent indicated they were "pessimistic" ... affected by Superstorm Sandy would be rebuilt better than ...
(Date:7/24/2014)... mid-July 2014, as the annual fire season continues across ... increased temperatures, are heavily sprinkled across the Congo (northwest), ... and Zambia (southeast). Thick gray smoke rises from some ... the Democratic Republic of the Congo, strong winds drive ... is an annual event in this region, as residents ...
Breaking Biology News(10 mins):Experts Weigh the Pros and Cons of a $1.7 Billion EPA Cleanup Plan for the Passaic River at an NJIT 2Rutgers study explores attitudes, preferences toward post-Sandy rebuilding 2
... and Zafer Iqbal, research professors at NJIT, were awarded ... arrays of nanoscale electrical probes. Their discovery may ... variation of electrical activity inside biological cells. ... technique that allows for an array of individual, vertically-oriented ...
... DUNES NATIONAL LAKESHORE, Ind. Native bees often small, ... stinging honeybees are quite discriminating about where they ... The study found that, overall, composition of a plant ... a bee community, which may seem counterintuitive at first, ...
... of California, Riverside have made a discovery in the ... drugs and explore novel strategies for treating seizures associated ... Americans. Neurons, the basic building blocks of the ... and chemical signaling. During epileptic seizures, which generally ...
Cached Biology News:Patent for arrays of nanoscale electrical probes awarded to NJIT today 2Picky pollinators: Native bees are selective about where they live and feed 2Picky pollinators: Native bees are selective about where they live and feed 3Picky pollinators: Native bees are selective about where they live and feed 4UC Riverside neuroscientists' discovery could bring relief to epilepsy sufferers 2
(Date:7/24/2014)... 2014 As part of the long-term ... the MENA region during 2014 with potential global expansion. ... agreement with DZS to manage our clinical trials globally ... VP of R&D and President of SBI pharmaceuticals MENA, ... practices with a focus on utilizing eClinical software and ...
(Date:7/23/2014)... , July 24, 2014 Lyfebulb, ... Pharmaceuticals Inc. (OTCQX and NASDAQ OMX First North ... or "the Company"), announced a collaboration to increase ... last night at an event attended by more ... parties. Lyfebulb is a health and wellness company ...
(Date:7/23/2014)...  Sangamo BioSciences, Inc. (NASDAQ: SGMO ) ... accomplishments. For the second quarter ended ... of $7.0 million, or $0.10 per share, compared to ... share, for the same period in 2013. As of ... marketable securities and interest receivable of $236.7 million. ...
(Date:7/23/2014)... Russian Quantum Center at Skolkovo) and Mario Ziman ... Institute of Physics in Bratislava, Slovakia) have found ... passing through an amplifier and, conversely, when transmitting ... in an article published in the journal ... entangled particles are considered to be the basis ...
Breaking Biology Technology:SBI Pharmaceuticals Co. Ltd. Enters into Preferred Provider Agreement with DZS Clinical Services 2Innovative Collaboration To Increase Awareness Of Bullous Pemphigoid, A Rare Autoimmune Disease Of The Skin 2Innovative Collaboration To Increase Awareness Of Bullous Pemphigoid, A Rare Autoimmune Disease Of The Skin 3Innovative Collaboration To Increase Awareness Of Bullous Pemphigoid, A Rare Autoimmune Disease Of The Skin 4Innovative Collaboration To Increase Awareness Of Bullous Pemphigoid, A Rare Autoimmune Disease Of The Skin 5Sangamo BioSciences Reports Second Quarter 2014 Financial Results 2Sangamo BioSciences Reports Second Quarter 2014 Financial Results 3Sangamo BioSciences Reports Second Quarter 2014 Financial Results 4Sangamo BioSciences Reports Second Quarter 2014 Financial Results 5Sangamo BioSciences Reports Second Quarter 2014 Financial Results 6Sangamo BioSciences Reports Second Quarter 2014 Financial Results 7Sangamo BioSciences Reports Second Quarter 2014 Financial Results 8Sangamo BioSciences Reports Second Quarter 2014 Financial Results 9Scientists find way to maintain quantum entanglement in amplified signals 2Scientists find way to maintain quantum entanglement in amplified signals 3Scientists find way to maintain quantum entanglement in amplified signals 4
... have used drivers, brain signals, for the first time, ... and a potential solution to the thousands of car ... electroencephalography (EEG) a technique that attaches electrodes to ... system, accompanied with modern traffic sensors, could detect a ...
... R.I. [Brown University] In a paper published this week ... the Republic of Georgia have learned how bats can home ... and dismissing other objects in their midst. The trick lies ... returning from their sonar pulses by distinguishing changes in amplitude ...
... batteries. New research at Rice University shows that tiny worlds ... Professor Pulickel Ajayan has packed an entire lithium ion energy ... in the American Chemical Society journal Nano Letters . ... devices can possibly get, and could be valuable as a ...
Cached Biology Technology:Put the brakes on using your brain power 2How bats stay on target despite the clutter 2Rice scientists build battery in a nanowire 2Rice scientists build battery in a nanowire 3
...
...
Kit for testing the ability of a compound to simulate lipolysis in cultured human adipocytes. Kit contains controls, buffers and reagents for detecting glycerol and non-esterified free fatty acids. A...
The strip cap tool is a used for properly seating 8- and 12-cap strips in microplates or strip tubes. A grooved channel on one side is designed to seat domed caps, while the flat edge on the opposite...
Biology Products: