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:9/15/2014)... of wild, domesticated, and domesticated-wild hybridized populations ... found that within 5 to 11 generations, ... wild populations that hybridized with domesticated populations. ... provides evidence that natural selection, over time, ... experience as a result of increased genetic ...
(Date:9/15/2014)... Vuoksi River and the subsequent rapid decrease in the ... revealed thousands of square kilometres of new, fertile land ... University of Helsinki researchers has studied the role that ... interaction between nature and humans. After dramatic shifts in ... changes and gave rise to a new, innovative culture. ...
(Date:9/15/2014)... PA, September 15, 2014 Schizophrenia is generally considered ... shares many risk factors, both genetic and environmental, with ... , The normal path for brain development is determined ... genes and a wide range of environmental factors. , ... patient populations are required in order to map the ...
Breaking Biology News(10 mins):The creation of the Vuoksi River preceded a significant cultural shift 2Brain Development in Schizophrenia Strays from the Normal Path 2
... A mutation in blood stem cells occurs in patients ... at the Moores Cancer Center at the University of ... Cell Biology and Regenerative Medicine and Comprehensive Cancer Center ... The discovery suggests that development of a very specific ...
... colleagues have produced 3-D images of ancient fossils -- 650 ... an achievement that has never been done before. , If ... Earth, Schopf said the techniques he has used, called confocal ... look at microscopic fossils inside the rocks to search for ...
... bone may rely on a few secrets from the ... Berkeley National Laboratory (Berkeley Lab) have harnessed the way ... is four times stronger than material currently used in ... variations of this substance could also be used in ...
Cached Biology News:Mutation in blood stem cells provides clues to cancer development 2Mutation in blood stem cells provides clues to cancer development 3Inside rocks, implications for finding life on Mars 2Secrets of the sea yield stronger artificial bone 2Secrets of the sea yield stronger artificial bone 3Secrets of the sea yield stronger artificial bone 4
(Date:9/15/2014)... The chemistry, taste, and health effects of tea can vary ... the nonprofit American Botanical Council (ABC). Recent research by ... on the phytochemical compounds in tea ( Camellia sinensis ) ... in the Yunnan province of southwestern ... future of medicinal botanicals. Dr. Ahmed,s report on ...
(Date:9/15/2014)... La deuxième édition annuelle de l, ... sur la sensibilisation au plasma) sera célébrée du ... Plasma Protein Therapeutics Association (PPTA) et ... à : , Sensibiliser davantage la ... plasma-aphérèse , Reconnaître la contribution des donneurs ...
(Date:9/15/2014)... Hydro Dynamics, Inc. (HDI) of Rome, ... will be partnering with Proteaf Technologies (Proteaf) of ... implementing its Shock Wave Power Reactor (SPR) cavitation ... flow chemistry through process intensification has been widely ... for decades. The continuous chemistry has been ...
(Date:9/14/2014)... particularly ingenious when it comes to survival strategies. They ... hostile environment, for example during treatment with antibiotics. A ... a protective slime capsule consisting of sugar chains and ... have for the first time created a detailed three-dimensional ... blocks cross the bacterial cell wall, a crucial step ...
Breaking Biology Technology:Tea Taste and Quality Affected by Climate Change 2Tea Taste and Quality Affected by Climate Change 3Tea Taste and Quality Affected by Climate Change 4L' International Plasma Awareness Week célébrera les donneurs et braquera les projecteurs sur les maladies rares 2L' International Plasma Awareness Week célébrera les donneurs et braquera les projecteurs sur les maladies rares 3Hydro Dynamics Partners with the Continuous Flow Chemistry Experts of Proteaf Technologies 2New insights in survival strategies of bacteria 2
... professionals often face the challenge of delivering cost-effective ... both storage and bandwidth efficiency, while providing seamless, ... SecureZip, a new family of products designed for ... a cross-platform environment. The company also introduced a ...
... Inc. announced Wednesday that its net sales are up ... The Milwaukee-based company, which does business as Merge ... the acquisition of RIS Logic, a radiology information systems ... eFilm's picture archiving and communication system, or PACS, used ...
... has announced a new network switch and router ... second, using designs bought from a Wisconsin company. , ... Eau Claire, designs application-specific integrated circuits and systems-on-a-chip. SLE ... System Packet Interface Level 4 Phase 2, or SPI ...
Cached Biology Technology:PKWare launches new enterprise product line, adds new features to PKZip 2PKWare launches new enterprise product line, adds new features to PKZip 3Agilent's new network chip was designed in Wisconsin 2
UBN-1 (C-20)...
P2A4...
pETDuet-1 is designed for the coexpression of two target genes....
... Recognizes K+ Cl- ... shows no significant sequence ... or CCC.,SPECIES REACTIVITIES: The ... conserved in human, mouse, ...
Biology Products: