including those that are made with graphene electrodes.""It's amazing to be able to design a molecular circuit,
has been developing sustainable nanomaterials since 2009.""If you take a big tree and cut it down to the individual fiber,
#Graphene gets bright: World's thinnest lightbulb developed Led by Young Duck Kim, a postdoctoral research scientist in James Hone's group at Columbia Engineering, a team of scientists from Columbia, Seoul National University (SNU),
and Korea Research Institute of Standards and Science (KRISS) reported today that they have demonstrated-for the first time-an on-chip visible light source using graphene, an atomically thin and perfectly crystalline form of carbon,
They attached small strips of graphene to metal electrodes, suspended the strips above the substrate,
right Visible light Emission from Graphene, is published in the Advance Online Publication (AOP) on Nature Nanotechnology's website on June 15."
and graphene-based on-chip optical communications.""Creating light in small structures on the surface of a chip is crucial for developing fully integrated'photonic'circuits that do with light
By measuring the spectrum of the light emitted from the graphene, the team was able to show that the graphene was reaching temperatures of above 2500 degrees Celsius,
hot enough to glow brightly. he visible light from atomically thin graphene is so intense that it is visible even to the naked eye,
without any additional magnification, explains Kim, first and co-lead author on the paper. Interestingly, the spectrum of the emitted light showed peaks at specific wavelengths,
which the team discovered was due to interference between the light emitted directly from the graphene
and light reflecting off the silicon substrate and passing back through the graphene. Kim notes
because graphene is transparent, unlike any conventional filament, and allows us to tune the emission spectrum by changing the distance to the substrate. he ability of graphene to achieve such high temperatures without melting the substrate
or the metal electrodes is due to another interesting property: as it heats up, graphene becomes a much poorer conductor of heat.
This means that the high temperatures stay confined to a small ot spotin the center. t the highest temperatures,
the electron temperature is much higher than that of acoustic vibrational modes of the graphene lattice,
observes. hese unique thermal properties allow us to heat the suspended graphene up to half of the temperature of the sun,
as compared to graphene on a solid substrate. he team also demonstrated the scalability of their technique by realizing large-scale of arrays of chemical-vapor-deposited (CVD) graphene light emitters.
The two components that make the UCLA-developed system work are a polymer donor and a nanoscale fullerene acceptor.
The polymer donor absorbs sunlight and passes electrons to the fullerene acceptor; the process generates electrical energy.
The plastic materials, called organic photovoltaics, are organized typically like a plate of cooked pasta a disorganized mass of long, skinny polymer paghettiwith random fullerene eatballs.
Some fullerene meatballs are designed to sit inside the spaghetti bundles, but others are forced to stay on the outside.
The fullerenes inside the structure take electrons from the polymers and toss them to the outside fullerene
The two components that make the UCLA-developed system work are a polymer donor and a nanoscale fullerene acceptor.
The polymer donor absorbs sunlight and passes electrons to the fullerene acceptor; the process generates electrical energy.
The plastic materials, called organic photovoltaics, are organized typically like a plate of cooked pasta a disorganized mass of long, skinny polymer paghettiwith random fullerene eatballs.
Some fullerene meatballs are designed to sit inside the spaghetti bundles, but others are forced to stay on the outside.
The fullerenes inside the structure take electrons from the polymers and toss them to the outside fullerene
The demand for a silicon material aided the discovery of graphene, a single layer of graphite
They conducted x-ray studies at the National Synchrotron Light source (NSLS) and electron microscopy at the Center for Functional Nanomaterials (CFN), both DOE Office of Science User Facilities."
#Graphene-based film can be used for efficient cooling of electronics Researchers have developed a method for efficiently cooling electronics using graphene-based film.
Moreover, the graphene film is attachable to electronic components made of silicon, which favours the film's performance compared to typical graphene characteristics shown in previous, similar experiments.
Electronic systems available today accumulate a great deal of heat, mostly due to the ever-increasing demand on functionality.
professor at Chalmers University of Technology, were the first to show that graphene can have a cooling effect on silicon-based electronics.
That was the starting point for researchers conducting research on the cooling of silicon-based electronics using graphene. ut the methods that have been in place so far have presented the researchers with problems Johan Liu says. t has become evident that those methods cannot be used to rid electronic devices
When you try to add more layers of graphene, another problem arises, a problem with adhesiveness.
the graphene no longer will adhere to the surface, since the adhesion is held together only by weak Van der waals bonds."
"e have solved now this problem by managing to create strong covalent bonds between the graphene film and the surface,
The stronger bonds result from so-called functionalisation of the graphene, i e. the addition of a property-altering molecule.
it creates so-called silane bonds between the graphene and the electronic component (see picture). Moreover, functionalisation using silane coupling doubles the thermal conductivity of the graphene.
The researchers have shown that the in-plane thermal conductivity of the graphene-based film, with 20 micrometer thickness, can reach a thermal conductivity value of 1600 W/mk,
which is four times that of copper. ncreased thermal capacity could lead to several new applications for graphene,
says Johan Liu.""One example is the integration of graphene-based film into microelectronic devices and systems,
such as highly efficient Light Emitting Diodes (LEDS), lasers and radio frequency components for cooling purposes. Graphene-based film could also pave the way for faster, smaller, more energy efficient, sustainable high power electronics."
"Image: Graphene-based film on an electronic component with high heat intensity. Credit: Johan Liu Source:
http://www. mynewsdesk. com/uk/chalmers/..
#Environmentally friendly lignin nanoparticle'greens'silver nanobullet to battle bacteria Researchers have developed an effective and environmentally benign method to combat bacteria by engineering nanoscale particles that add the antimicrobial potency of silver to a core of lignin,
Ning group started pursuing the distinctive properties of nanomaterials, such as nanowires or nanosheets, more than 10 years ago.
He and his students have been researching various nanomaterials to see how far they could push the limit of advantages of nanomaterials to explore the high crystal quality growth of very dissimilar materials.
Improve Lives of Millions March 5th, 2015anousheh Ansari Wins the National Space Society's Space Pioneer Award for"Service to the Space Community"March 5th, 2015enhanced Graphene Components for Next
2015quantum research past, present and future for discussion at AAAS February 16th, 2015discoveries Enhanced Graphene Components for Next Generation Racing yacht March 5th, 2015american Chemical Society Presidential Symposia:
Improve Lives of Millions March 5th, 2015anousheh Ansari Wins the National Space Society's Space Pioneer Award for"Service to the Space Community"March 5th, 2015enhanced Graphene Components for Next
Professor Cronin's research spans a broad range of topics including electrical and spectroscopic characterization of carbon nanotubes, graphene,
and other novel lower dimensional materials. 2d materials such as graphene and few-layer transition metal dichalcogenides (TMDCS) have been attracting a lot of research interest in recent years
While graphene has many advantages it is suited not to the field of optoelectronics where TMDCS such as molybdenum disulphide (Mos2) have a clear advantage thanks to exhibiting a finite band gap in the visible wavelength range.
#Caltech scientists develop cool process to make better graphene Abstract: A new technique invented at Caltech to produce graphene--a material made up of an atom-thick layer of carbon--at room temperature could help pave the way for commercially feasible graphene-based solar cells and light-emitting diodes, large-panel displays, and flexible electronics."
"With this new technique, we can grow large sheets of electronic-grade graphene in much less time
and at much lower temperatures,"says Caltech staff scientist David Boyd, who developed the method.
and the novel properties of the graphene it produces. Graphene could revolutionize a variety of engineering and scientific fields due to its unique properties,
which include a tensile strength 200 times stronger than steel and an electrical mobility that is two to three orders of magnitude better than silicon.
or 1, 000 degrees Celsius--for incorporating graphene fabrication with current electronic manufacturing. Additionally, high-temperature growth of graphene tends to induce large, uncontrollably distributed strain--deformation--in the material,
which severely compromises its intrinsic properties.""Previously, people were only able to grow a few square millimeters of high-mobility graphene at a time,
and it required very high temperatures, long periods of time, and many steps,"says Caltech physics professor Nai-Chang Yeh, the Fletcher Jones Foundation Co-Director of the Kavli Nanoscience Institute and the corresponding author of the new study."
"Our new method can consistently produce high-mobility and nearly strain-free graphene in a single step in just a few minutes without high temperature.
at that time a Caltech professor of mechanical engineering and applied physics, was trying to reproduce a graphene-manufacturing process he had read about in a scientific journal.
In this process, heated copper is used to catalyze graphene growth.""I was playing around with it on my lunch hour,
which provides the carbon atoms needed for graphene growth. When later Boyd examined the copper plate using Raman spectroscopy,
a technique used for detecting and identifying graphene, he saw evidence that a graphene layer had formed indeed."
"It was an'A-ha!''moment,"Boyd says.""I realized then that the trick to growth is to have a very clean surface, one without the copper oxide."
but that it simultaneously produced graphene as well. At first, Boyd could not figure out why the technique was so successful.
"The valves were letting in just the right amount of methane for graphene to grow,
The ability to produce graphene without the need for active heating not only reduces manufacturing costs,
and nine to ten different steps to make a batch of high-mobility graphene using high-temperature growth methods,
"Work by Yeh's group and international collaborators later revealed that graphene made using the new technique is of higher quality than graphene made using conventional methods:
and it has the highest electrical mobility yet measured for synthetic graphene. The team thinks one reason their technique is so efficient is that a chemical reaction between the hydrogen plasma
which to grow graphene. The scientists also discovered that their graphene grows in a special way.
Graphene produced using conventional thermal processes grows from a random patchwork of depositions. But graphene growth with the plasma technique is more orderly.
The graphene deposits form lines that then grow into a seamless sheet, which contributes to its mechanical and electrical integrity.
A scaled-up version of their plasma technique could open the door for new kinds of electronics manufacturing,
Yeh says. For example, graphene sheets with low concentrations of defects could be used to protect materials against degradation from exposure to the environment.
Another possibility would be to grow large sheets of graphene that can be used as a transparent conducting electrode for solar cells and display panels."
"In the future, you could have based graphene cellphone displays that generate their own power, "Yeh says. Another possibility, she says,
is to introduce intentionally imperfections into graphene's lattice structure to create specific mechanical and electronic attributes."
"If you can strain graphene by design at the nanoscale, you can artificially engineer its properties.
But for this to work, you need to start with a perfectly smooth, strain-free sheet of graphene,
"Yeh says.""You can't do this if you have a sheet of graphene that has uncontrollable defects in different places."#
"##Along with Yeh and Boyd, additional authors on the paper,"Single-Step Deposition Of high-Mobility Graphene at Reduced Temperatures,"include Caltech graduate students Wei Hsiang Lin, Chen Chih
Hsu and Chien-Chang Chen; Caltech staff scientist Marcus Teague; Yuan-Yen Lo, Tsung-Chih Cheng,
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
New cheap and efficient electrode for splitting water March 18th, 2015graphene Graphene'gateway'discovery opens possibilities for improved energy technologies March 18th,
2015imperfect graphene opens door to better fuel cells: Membrane could lead to fast-charging batteries for transportation March 18th,
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
New cheap and efficient electrode for splitting water March 18th, 2015energy Graphene'gateway'discovery opens possibilities for improved energy technologies March 18th, 2015clean energy future:
New cheap and efficient electrode for splitting water March 18th, 2015imperfect graphene opens door to better fuel cells:
and reduce damage on biomolecules and two-dimensional nanomaterials, such as graphene March 18th, 2015graphene'gateway'discovery opens possibilities for improved energy technologies March 18th,
2015drexel Univ. materials research could unlock potential of lithium-sulfur batteries March 17th, 2015symmetry matters in graphene growth:
Rice university scientists gain control of electronic, fluorescent properties of coal-based graphene Abstract: Graphene quantum dots made from coal,
introduced in 2013 by the Rice university lab of chemist James Tour, can be engineered for specific semiconducting properties in either of two single-step processes.
In a new study this week in the American Chemical Society journal Applied materials & Interfaces, Tour and colleagues demonstrated fine control over the graphene oxide dots'size-dependent band gap,
Tour said graphene quantum dots may prove highly efficient in applications ranging from medical imaging to additions to fabrics and upholstery for brighter and longer-lasting colors."
Graphene quantum dots are photoluminescent, which means they emit light of a particular wavelength in response to incoming light of a different wavelength.
and reduce damage on biomolecules and two-dimensional nanomaterials, such as graphene March 18th, 2015news and information 30 years after C60:
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015symmetry matters in graphene growth:
Rice researchers find subtle interactions with substrate may lead to better control March 16th, 2015eeja and Tokyo U Achieve Simultaneous Formation of Contact Electrodes for P-type
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
Rice researchers'theory combines strength, stiffness and toughness of composites into a single design map March 16th, 2015symmetry matters in graphene growth:
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
The project is funded through the Flexible Resorbable Organic and Nanomaterial Therapeutic Systems (FRONTS) program of the National Science Foundation.##
Controlling particles with light and microfibers March 18th, 2015imperfect graphene opens door to better fuel cells: Membrane could lead to fast-charging batteries for transportation March 18th, 2015news and information 30 years after C60:
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015graphene'gateway'discovery opens possibilities for improved energy technologies March 18th, 2015clean energy future:
Rice university scientists gain control of electronic, fluorescent properties of coal-based graphene March 18th, 2015graphene'gateway'discovery opens possibilities for improved energy technologies March 18th,
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015graphene'gateway'discovery opens possibilities for improved energy technologies March 18th, 2015clean energy future:
New cheap and efficient electrode for splitting water March 18th, 2015imperfect graphene opens door to better fuel cells:
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015graphene'gateway'discovery opens possibilities for improved energy technologies March 18th, 2015clean energy future:
New cheap and efficient electrode for splitting water March 18th, 2015imperfect graphene opens door to better fuel cells:
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015graphene'gateway'discovery opens possibilities for improved energy technologies March 18th, 2015clean energy future:
New cheap and efficient electrode for splitting water March 18th, 2015imperfect graphene opens door to better fuel cells:
or continuous formation of polymer nanofibers and other nanomaterials in the bulk of a sheared fluid medium is introduced.
you can create multiple types of nanomaterials of different shapes and sizes.""""Large quantities are paramount in nanomanufacturing,
and reduce damage on biomolecules and two-dimensional nanomaterials, such as graphene March 18th, 2015rice fine-tunes quantum dots from coal:
Rice university scientists gain control of electronic, fluorescent properties of coal-based graphene March 18th, 2015nano piano's lullaby could mean storage breakthrough March 16th, 2015nanoelectronics Quantum computing:
2015discoveries Stable long term operation of graphene devices achieved (Kopie 1 march 17th, 2015maps predict strength of structures:
2015stable long term operation of graphene devices achieved (Kopie 1 march 17th, 2015four Scientists With Major Contributions to Research at Brookhaven Lab Named American Physical Society Fellows March 17th, 201
Distinguished University and Trustee Chair professor in the College of Engineering and director of its Nanomaterials Research Group, has created a two-dimensional carbon/sulfur nanolaminate that could be a viable candidate for use as a lithium-sulfur
along with his colleagues at Aix-Marseille University explain their process for extracting the nanolaminate from a three-dimensional material called a Ti2sc MAX phase.
The researchers found that carbon/sulfur nanolaminates have covalent bonding between carbon and sulfur and an extremely uniform distribution of sulfur between the atomically thin carbon layers.
Currently, sulfur infiltrated carbon nanomaterials have demonstrated to be the most promising cathode materials for Li-S batteries.
The carbon/sulfur nanolaminates synthesized by Gogotsi's group demonstrate the same uniformity as the infiltrated carbon nanomaterials,
but the sulfur in the nanolaminates is deposited uniformly in the carbon matrix as atomically thin layers
Few studies explore toxicity of cellulose nanocrystals March 10th, 2015thin films Graphene meets heat waves March 9th, 2015ciqus researchers obtain high-quality perovskites over large areas by a chemical method March 4th,
researchers added glass cage-like coating and graphene oxide March 2nd, 2015researchers turn unzipped nanotubes into possible alternative for platinum:
or graphene based supercapacitors for attaching redox active material on the current collector. Without the mass of binding materials, the hybrid electrode is a good candidate to make lightweight supercapacitors."
#Printing 3-D graphene structures for tissue engineering: A new ink formulation allows for the 3-D printing of graphene structures Abstract:
Ever since single-layer graphene burst onto the science scene in 2004, the possibilities for the promising material have seemed nearly endless.
With its high electrical conductivity, ability to store energy, and ultra-strong and lightweight structure, graphene has potential for many applications in electronics, energy, the environment,
and even medicine. Now a team of Northwestern University researchers has found a way to print three-dimensional structures with graphene nanoflakes.
The fast and efficient method could open up new opportunities for using graphene printed scaffolds regenerative engineering and other electronic or medical applications.
Led by Ramille Shah assistant professor of materials science and engineering at Northwestern's Mccormick School of engineering and of surgery in the Feinberg School of medicine,
and her postdoctoral fellow Adam Jakus, the team developed a novel graphene-based ink that can be used to print large, robust 3-D structures."
"People have tried to print graphene before, "Shah said.""But it's been a mostly polymer composite with graphene making up less than 20 percent of the volume."
"With a volume so meager, those inks are unable to maintain many of graphene's celebrated properties.
But adding higher volumes of graphene flakes to the mix in these ink systems typically results in printed structures too brittle and fragile to manipulate.
Shah's ink is the best of both worlds. At 60-70 percent graphene, it preserves the material's unique properties,
including its electrical conductivity. And it's flexible and robust enough to print robust macroscopic structures.
the graphene flakes are mixed with a biocompatible elastomer and quickly evaporating solvents.""It's a liquid ink,
"Supported by a Google Gift and a Mccormick Research Catalyst Award, the research is described in the paper"Three-dimensional printing of high-content graphene scaffolds for electronic and biomedical applications,"published in the April
An expert in biomaterials, Shah said 3-D printed graphene scaffolds could play a role in tissue engineering and regenerative medicine as well as in electronic devices.
"The printed graphene structure is also flexible and strong enough to be sutured easily to existing tissues,
and graphene's electrical conductivity most likely contributed to the scaffold's biological success."Cells conduct electricity inherently--especially neurons,
"The graphene-based ink directly follows work that Shah and her graduate student Alexandra Rutz completed earlier in the year to develop more cell-compatible, water-based, printable gels.
The company has created a graphene-based product for the remediation of water contaminated by oil and hydrocarbons Abstract:
Directa Plus at 18th European Forum on Eco-innovation to present GENIUS, the innovative project that leads to the creation of a graphene-based product able to remove hydrocarbons from polluted water
project success stories, this afternoon from 2. 30 pm to 4. 30 pm, Directa Plus will present GENIUS, Graphene.
The creation of this graphene-based oil-adsorbent product, commercialized as Grafysorber, has been promoted by GENIUS project
which develops processes for the production of a new generation of graphene-based nanomaterials targeting existing global markets.
The headquarter is in Lomazzo (near Como), inside the Science and Technological Park of Comonext, where in June 2014 Directa Plus opened Le Officine del Grafene Graphene Factory, the largest European
pristine graphene nanoplatelets industrial production unit, based on a patented and approved technology. For more information, please click herecontacts:
Graphene Taking control of light emission: Researchers find a way of tuning light waves by pairing 2 exotic 2-D materials May 20th, 2015news and information SUNY Poly CNSE and NIOSH Launch Federal
Uncovering the real history of art using a graphene scanner Museum curators, art restorers, archaeologists and the broader public will soon be able to learn much more about paintings and other historic objects,
thanks to an EU project which has become a pioneer in noninvasive art exploration techniques, based on a graphene scanner.
Uncovering the real history of art using a graphene scanner Luxembourg Posted on May 21st,2015 Researchers working on INSIDDE,
have developed a graphene scanner that can explore under the surface of a painting, or through the dirt covering an ancient object unearthed in an archaeological dig,
Until graphene, considered to be one of the materials of the future came along it was difficult to generate terahertz frequencies to acquire such detail.
Graphene in this application acts as a frequency multiplier, allowing scientists to reveal previously hidden features such as brushstroke textures, pigments and defects,
Uncovering the real history of art using a graphene scanner May 21st, 2015directa Plus in Barcelona to present the innovative project GENIUS for oil spills cleanup activities:
The company has created a graphene-based product for the remediation of water contaminated by oil
2015nanotubes/Buckyballs/Fullerenes Sandia researchers first to measure thermoelectric behavior by'Tinkertoy'materials May 20th, 2015cotton fibres instead of carbon nanotubes May 9th, 2015a better way to build DNA scaffolds:
Uncovering the real history of art using a graphene scanner May 21st, 2015effective Nano-Micelles Designed in Iran to Treat Cancer May 20th, 2015materials/Metamaterials Taking control of light emission:
2015wearables may get boost from boron-infused graphene: Rice U. researchers flex muscle of laser-written microsupercapacitors May 18th,
Uncovering the real history of art using a graphene scanner May 21st, 2015directa Plus in Barcelona to present the innovative project GENIUS for oil spills cleanup activities:
The company has created a graphene-based product for the remediation of water contaminated by oil
including those that are made with graphene electrodes.""It's amazing to be able to design a molecular circuit,
This solvent also offers enhanced properties for nanotechnology and for the stability of these nanomaterials in solution.
Non-aqueous solvent supports DNA NANOTECHNOLOGY May 27th, 2015controlled Release of Anticorrosive Materials in Spot by Nanocarriers May 27th, 2015production of Copper Cobaltite Nanocomposites with Photocatalytic Properties in Iran
and repulsive forces between DNA-linked particles to make dynamic, phase-shifting forms of nanomaterials May 25th,
and repulsive forces between DNA-linked particles to make dynamic, phase-shifting forms of nanomaterials May 25th,
Non-aqueous solvent supports DNA NANOTECHNOLOGY May 27th, 2015controlled Release of Anticorrosive Materials in Spot by Nanocarriers May 27th, 2015production of Copper Cobaltite Nanocomposites with Photocatalytic Properties in Iran
Non-aqueous solvent supports DNA NANOTECHNOLOGY May 27th, 2015controlled Release of Anticorrosive Materials in Spot by Nanocarriers May 27th, 2015production of Copper Cobaltite Nanocomposites with Photocatalytic Properties in Iran
and repulsive forces between DNA-linked particles to make dynamic, phase-shifting forms of nanomaterials May 25th,
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