It is expected highly that the N-ACNT/G sandwiches hold various potential applications in the area of nanocomposite energy storage environmental protection electronic device as well as healthcare because of their robust hierarchical structure 3d electron transfer
That structure can then be coated with a thin layer of just about any kind of material metal, an alloy, a glass, a semiconductor, etc.
#'Human touch'nanoparticle sensor could improve breast cancer detection (Phys. org) niversity of Nebraska-Lincoln scientists have developed a nanoparticle-based device that emulates human touch
In a newly published article in the journal ACS Advanced Materials & Interfaces, researchers Ravi Saraf and Chieu Van Nguyen describe a thin-film sensor that can detect tumors too small and deep
The film, just one-60th the thickness of a human hair, is a sort of"electronic skin"able to sense texture and relative stiffness.
an advancement that could enable electronic devices to function with very little energy. The process involves passing electrons through a quantum well to cool them
which consists of a sequential array of a source electrode, a quantum well, a tunneling barrier, a quantum dot,
and a drain electrode to suppress electron excitation and to make electrons cold. Cold electrons promise a new type of transistor that can operate at extremely low energy consumption."
"Implementing our findings to fabricating energy-efficient transistors is currently under way,"Koh added. Khosrow Behbehani, dean of the UT Arlington College of Engineering, said this research is representative of the University's role in fostering innovations that benefit the society,
such as creating energy-efficient green technologies for current and future generations.""Dr. Koh and his research team are developing real-world solutions to a critical global challenge of utilizing the energy efficiently
"When implemented in transistors, these research findings could potentially reduce energy consumption of electronic devices by more than 10 times compared to the present technology,
"Varshney said.""Personal electronic devices such as smart phones, ipads, etc. can last much longer before recharging."
"In addition to potential commercial applications, there are many military uses for the technology. Batteries weigh a lot, and less power consumption means reducing the battery weight of electronic equipment that soldiers are carrying,
which will enhance their combat capability. Other potential military applications include electronics for remote sensors, unmanned aerial vehicles and high-capacity computing in remote operations.
Future research could include identifying key elements that will allow electrons to be cooled even further.
and high charge-carrier mobility, promises to be a revolutionary material for making next-generation high-speed transistors.
Besides its applications in circuitry and sensors graphene is of interest as a super-strong coating.
#Doped graphene nanoribbons with potential Graphene is a semiconductor when prepared as an ultra-narrow ribbon although the material is actually a conductive material.
which enables semiconductors to be in an insulating state. The problem however is that the bandgap in graphene is extremely small.
and negative charges across different regions of the semiconductor crystal thereby creating the basic structure allowing the development of many components used in the semiconductor industry.
Transferring graphene nanoribbons onto other substratesin addition the scientists have solved another key issue for the integration of graphene nanotechnology into conventional semiconductor industry:
Graphene is thus increasingly emerging as an interesting semiconductor material and a welcome addition to the omnipresent silicon.
The semiconducting graphene nanoribbons are particularly attractive as they allow smaller and thus more energy efficient and faster electronic components than silicon.
However the generalized use of graphene nanoribbons in the electronics sector is anticipated not in the near future due in part to scaling issues
and in part to the difficulty of replacing well-established conventional silicon-based electronics. Fasel estimates that it may still take about 10 to 15 years before the first electronic switch made of graphene nanoribbons can be used in a product.
#Ultra-thin high-speed detector captures unprecedented range of light waves New research at the University of Maryland could lead to a generation of light detectors that can see below the surface of bodies walls and other objects.
Using the special properties of graphene a two-dimensional form of carbon that is only one atom thick a prototype detector is able to see an extraordinarily broad band of wavelengths.
A research paper about the new detector was published Sunday September 07 2014 in Nature Nanotechnology.
Lead author Xinghan Cai a University of Maryland physics graduate student said a detector like the researchers'prototype could find applications in emerging terahertz fields such as mobile communications medical imaging chemical sensing
however in part because it is difficult to detect light waves in this Range in order to maintain sensitivity most detectors need to be kept extremely cold around 4 Kelvin or-452 degrees Fahrenheit.
Existing detectors that work at room temperature are bulky slow and prohibitively expensive. The new room temperature detector developed by the University of Maryland team
and colleagues at the U s. Naval Research Lab and Monash University Australia gets around these problems by using graphene a single layer of interconnected carbon atoms.
Using a new operating principle called the hot-electron photothermoelectric effect the research team created a device that is as sensitive as any existing room temperature detector in the terahertz range
Graphene a sheet of pure carbon only one atom thick is suited uniquely to use in a terahertz detector
The concept behind the detector is simple says University of Maryland Physics Professor Dennis Drew.
The speed and sensitivity of the room temperature detector presented in this research opens the door to future discoveries in this in-between zone.
#First graphene-based flexible display produced A flexible display incorporating graphene in its pixels'electronics has been demonstrated successfully by the Cambridge Graphene Centre and Plastic Logic,
the first time graphene has been used in a transistor-based flexible device. The partnership between the two organisations combines the graphene expertise of the Cambridge Graphene Centre (CGC),
with the transistor and display processing steps that Plastic Logic has developed already for flexible electronics.
and is a first step towards the wider implementation of graphene and graphene-like materials into flexible electronics.
and has the potential to revolutionise industries from healthcare to electronics. The new prototype is an active matrix electrophoretic display,
similar to the screens used in today's e readers, except it is made of flexible plastic instead of Glass in contrast to conventional displays, the pixel electronics,
or backplane, of this display includes a solution-processed graphene electrode, which replaces the sputtered metal electrode layer within Plastic Logic's conventional devices,
bringing product and process benefits. Graphene is more flexible than conventional ceramic alternatives like indium-tin oxide (ITO) and more transparent than metal films.
The ultra-flexible graphene layer may enable a wide range of products including foldable electronics. Graphene can also be processed from solution bringing inherent benefits of using more efficient printed
and roll-to-roll manufacturing approaches. The new 150 pixel per inch (150 ppi) backplane was made at low temperatures (less than 100°C) using Plastic Logic's Organic Thin Film Transistor (OTFT) technology.
The graphene electrode was deposited from solution and subsequently patterned with micron-scale features to complete the backplane.
For this prototype, the backplane was combined with an electrophoretic imaging film to create an ultra-low power and durable display.
Future demonstrations may incorporate liquid crystal (LCD) and organic light emitting diodes (OLED) technology to achieve full colour and video functionality.
Lightweight flexible active-matrix backplanes may also be used for sensors with novel digital medical imaging and gesture recognition applications already in development."
"We are happy to see our collaboration with Plastic Logic resulting in the first graphene-based electrophoretic display exploiting graphene in its pixels'electronics,
"said Professor Andrea Ferrari, Director of the Cambridge Graphene Centre.""This is a significant step forward to enable fully wearable and flexible devices.
which will soon enable a new generation of ultra-flexible and even foldable electronics"This joint effort between Plastic Logic
#Team develops ultra sensitive biosensor from molybdenite semiconductor Move over graphene. An atomically thin two-dimensional ultrasensitive semiconductor material for biosensing developed by researchers at UC Santa barbara promises to push the boundaries of biosensing technology in many fields from health care to environmental protection to forensic industries.
Based on molybdenum disulfide or molybdenite (Mos2) the biosensor materialsed commonly as a dry lubricanturpasses graphene's already high sensitivity offers better scalability
Semiconductor materials have a small but nonzero band gap and can be switched between conductive and insulated states controllably.
While graphene has attracted wide interest as a biosensor due to its two-dimensional nature that allows excellent electrostatic control of the transistor channel by the gate
and high surface-to-volume ratio the sensitivity of a graphene field-effect transistor (FET) biosensor is restricted fundamentally by the zero band gap of graphene that results in increased leakage current leading to reduced sensitivity
Graphene has been used among other things to design FETSEVICES that regulate the flow of electrons through a channel via a vertical electric field directed into the channel by a terminal called a gate.
In digital electronics these transistors control the flow of electricity throughout an integrated circuit and allow for amplification and switching.
Enter Mos2 a material already making waves in the semiconductor world for the similarities it shares with graphene including its atomically thin hexagonal structure and planar nature as well as
act like a semiconductor. Monolayer or few-layer Mos2 have a key advantage over graphene for designing an FET biosensor:
An Mos2-based ph sensor achieving sensitivity as high as 713 for a ph change by one unit
At present the scientific community worldwide is actively seeking practical applications of 2d semiconductor materials such as Mos2 nanosheets.
New rapid synthesis developed for bilayer graphene and high-performance transistors More information: ACS Nano pubs. acs. org/doi/abs/10.1021/nn500914 i
and light along the same tiny wire a finding that could be a step towards building computer chips capable of transporting digital information at the speed of light.
and atomically thin material that can be exploited for nanophotonic integrated circuits said Nick Vamivakas assistant professor of quantum optics and quantum physics at the University of Rochester and senior author of the paper.
because devices that focus light cannot be miniaturized nearly as well as electronic circuits said Goodfellow. The new results hold promise for guiding the transmission of light
In bulk Mos2 electrons and photons interact as they would in traditional semiconductors like silicon and gallium arsenide.
Combining electronics and photonics on the same integrated circuits could drastically improve the performance and efficiency of mobile technology.
The researchers say the next step is to demonstrate their primitive circuit with light emitting diodes.
Scientists from NIST's Physical Measurement Laboratory, led by the Semiconductor and Dimensional Metrology Division's David Gundlach and Curt Richter,
and how long does it take to get the photogenerated charge through the semiconductor mixture to the electrodes?
which use inexpensive organic semiconductor materials sandwiched between two metal electrodes. OP devices can be made flexible and easily portable.
acts as a large solar system that can be used to recharge portable electronics and lights for the upcoming night of camping."
and carrier concentrations with an accurate nanoscale picture of the semiconductor film's microstructure really gives a complete picture of how the device operates and
"And since the physical process governing organic photovoltaics is very similar to other organic semiconductors (organic light-emitting diodes, for example,
"A lot of the understanding being developed here can also be applied to make better organic light emitting diodes,
The 100 nm thick device has a three-layer structure top semitransparent electrode, the organic photovoltaic,
For the impedance spectroscopy measurements, the sample was installed beneath an LED broadband white light, calibrated to one Sun illumination (natural sunlight).
so that the specialized detectors could take a clearer look at the sample. With this innovation the team was finally able to obtain images as well as simultaneous chemical maps of where different elements are located in the sample.
In the current work Graphene based photodetectors were integrated in a conventional silicon photonic platform designed for future on-chip applications in the area of ultrafast data communication.
but also demonstrate for the first time that Graphene based photodetectors surpass comparable detectors based on conventional materials concerning maximal data rates.
and chemists itching with excitement mesmerised by the possibilities starting to take shape from flexible electronics embedded into clothing to biomedicine (imagine synthetic nerve cells) vastly superior forms of energy storage (tiny
One is a graphene gel that works as a supercapacitor electrode and the second is a 3-D porous graphene foam.
The graphene gel provides the same functionality as porous carbon a material currently sourced from coconut husks for use in supercapacitors and other energy conversion and storage technologies but with vastly enhanced performance.
Supercapacitors have an expanding range of applications as their capabilities increase from powering computer memory backup to powering electric vehicles.
#Scientists craft atomically seamless thinnest-possible semiconductor junctions Scientists have developed what they believe is the thinnest-possible semiconductor,
a new class of nanoscale materials made in sheets only three atoms thick. The University of Washington researchers have demonstrated that two of these single-layer semiconductor materials can be connected in an atomically seamless fashion known as a heterojunction.
This result could be the basis for next-generation flexible and transparent computing, better light-emitting diodes,
or LEDS, and solar technologies.""Heterojunctions are fundamental elements of electronic and photonic devices, "said senior author Xiaodong Xu, a UW assistant professor of materials science and engineering and of physics."
"Our experimental demonstration of such junctions between two-dimensional materials should enable new kinds of transistors, LEDS, nanolasers,
and solar cells to be developed for highly integrated electronic and optical circuits within a single atomic plane."
The researchers discovered that two flat semiconductor materials can be connected edge-to-edge with crystalline perfection.
which was key to creating the composite two-dimensional semiconductor. Collaborators from the electron microscopy center at the University of Warwick in England found that all the atoms in both materials formed a single honeycomb lattice structure, without any distortions or discontinuities.
thinnest-possible semiconductor junctions A high-resolution scanning transmission electron microscopy (STEM) image shows the lattice structure of the heterojunctions in atomic precision.
"Scientists craft atomically seamless, thinnest-possible semiconductor junctions With a larger furnace, it would be possible to mass-produce sheets of these semiconductor heterostructures,
the researchers said. On a small scale, it takes about five minutes to grow the crystals, with up to two hours of heating and cooling time."
"In the future, combinations of two-dimensional materials may be integrated together in this way to form all kinds of interesting electronic structures such as in-plane quantum wells and quantum wires, superlattices, fully functioning transistors,
and even complete electronic circuits.""The researchers have demonstrated already that the junction interacts with light much more strongly than the rest of the monolayer,
Researchers demonstrate ultrafast charge transfer in new family of 2-D semiconductors A new argument has just been added to the growing case for graphene being bumped off its pedestal as the next big thing in the high-tech world by the two-dimensional semiconductors
our study suggests that MX2 heterostructures, with their remarkable electrical and optical properties and the rapid development of large-area synthesis, hold great promise for future photonic and optoelectronic applications."
These 2d semiconductors feature the same hexagonal"honeycombed"structure as graphene and superfast electrical conductance,
This facilitates their application in transistors and other electronic devices because unlike graphene, their electrical conductance can be switched off."
"For example, the combination of Mos2 and WS2 forms a type-II semiconductor that enables fast charge separation.
not only for photonics and optoelectronics, but also for photovoltaics.""MX2 semiconductors have extremely strong optical absorption properties
and compared with organic photovoltaic materials, have a crystalline structure and better electrical transport properties,
and MX2 semiconductors provide an ideal way to spatially separate electrons and holes for electrical collection and utilization."
#Conductive nanofiber networks for flexible unbreakable and transparent electrodes Transparent conductors are required as electrodes in optoelectronic devices, such as touch panel screens, liquid crystal displays, and solar cells.
However, ITO-based transparent electrodes are brittle, prone to breakage, and expensive. Therefore, there is strong demand for alternatives to ITO transparent electrodes.
Tokyo Institute of technology researchers report the first development of a facile method for the fabrication of flexible and unbreakable transparent electrodes using nanofibers.
Two-dimensional aluminum (Al) nanofiber networks offering transparent conductors were fabricated by simple wet chemical etching of Al metalized polymer films using an electrospun polystyrene nanofiber mask template.
and transparent electrodes are promising for applications in both large-scale and mobile optoelectronic devices including ones that are flexible.
Examples of applications are large displays, large interactive touch screens, photovoltaic solar panels, light-emitting diode panels, smart phones,
It uses an aluminum grating that can be added to silicon photodetectors with the silicon microchip industry's mainstay technology complementary metal-oxide semiconductor or CMOS.
This color filtering is done commonly using off-chip dielectric or dye color filters which degrade under exposure to sunlight
and can also be difficult to align with imaging sensors. Today's color filtering mechanisms often involve materials that are not CMOS-compatible
but this new approach has advantages beyond on-chip integration said LANP Director Naomi Halas the lead scientist on the study.
Bob has created a biomimetic detector that emulates what we are hypothesizing the squid skin'sees'Halas said.
Not only are we using the photodetector as an amplifier we're also using the plasmonic color filter as a way to increase the amount of light that goes into the detector he said.
To the best of the researchers'knowledge, this reversible capacity is the highest among all Co3o4 electrodes ever reported.
With these advantages, the researchers expect the df-G to bring significant advances of composite electrodes for a variety of electrochemical system,
and capacitors r
#Copper shines as flexible conductor Bend them, stretch them, twist them, fold them: modern materials that are light,
"A low loading of nano wires would be appropriate for a pressure sensor whereas a high loading is suitable for a stretchable conductor."
They can be used in rubberlike electronic devices that, unlike paperlike electronic devices, can stretch as well as bend. They can also be attached to topologically complex curved surfaces,
serving as real skin-like sensing devices, Associate professor Cheng said. In their report, published recently in ACS Nano,
#Graphene rubber bands could stretch limits of current healthcare New research published today in the journal ACS Nano identifies a new type of sensor that can monitor body movements
Although body motion sensors already exist in different forms they have not been used widely due to their complexity and cost of production.
Now researchers from the University of Surrey and Trinity college Dublin have treated for the first time common elastic bands with graphene to create a flexible sensor that is sensitive enough for medical use
-which imparts an electromechanical response on movement the team discovered that the material can be used as a sensor to measure a patient's breathing heart rate
Until now no such sensor has been produced that meets needs and that can be made easily. It sounds like a simple concept
and joint movement and could be used to create lightweight sensor suits for vulnerable patients such as premature babies making it possible to remotely monitor their subtle movements and alert a doctor to any worrying behaviours.
These sensors are compared extraordinarily cheap to existing technologies. Each device would probably cost pennies instead of pounds making it ideal technology for use in developing countries where there are not enough medically trained staff to effectively monitor
New sensor could light the way forward in low-cost medical imagin g
#Bacterial nanowires: Not what we thought they were For the past 10 years scientists have been fascinated by a type of electric bacteria that shoots out long tendrils like electric wires using them to power themselves
In addition this research has the potential to inform the creation of living microbial circuits forming the foundation of hybrid biological-synthetic electronic devices.
and others at the University of Massachusetts Amherst today report a breakthrough technique for controlling molecular assembly of nanoparticles over multiple length scales that should allow faster cheaper more ecologically friendly manufacture of organic photovoltaics and other electronic devices.
The new method should reduce the time nano manufacturing firms spend in trial-and-error searches for materials to make electronic devices such as solar cells organic transistors and organic light-emitting diodes.
Beyond catalysis, Ying predicts these new materials could be useful in electronics, chemical sensing and even biomedicine.
#An inkjet-printed field-effect transistor for label-free biosensing Thin-film transistors (TFTS) are powerful devices in semiconductor manufacturing
and form the basis of countless electronic devices such as memory chips photovoltaic cells logic gates and sensors. An interesting alternative to inorganic TFTS (silicon) is organic TFTS (OTFTS)
The Group published in the last issue of Advanced Functional Materials an article describing a flexible biological field-effect transistor (Biofet) for use in biosensing.
It was made by inkjet printing of an organic field-effect transistor (OFET) and subsequent functionalization of the insulator with specific antibodies.
An Inkjet-Printed Field-Effect Transistor for Label-Free Biosensing. Advanced Functional Materials. Article first published online:
#New graphene framework bridges gap between traditional capacitors batteries Researchers at the California Nanosystems Institute (CNSI) at UCLA have set the stage for a watershed in mobile energy storage by using a special graphene material
to significantly boost the energy density of electrochemical capacitors, putting them on a par with lead acid batteries.
but allows electrochemical capacitors to maintain their high power density (the amount of power per unit of mass or volume), according to Xiangfeng Duan,
Electrochemical capacitors, also known as ECS or supercapacitors, are an important technology for the future of energy storage and mobile power supplies,
Because the main component of an EC is its electrode material, which is responsible for the EC's overall performance,
A high-performance EC electrode must have high electrical conductivity, a high ion-accessible surface area, a high ionic transport rate and high electrochemical stability.
Current state-of-the-art ECS generally use porous activated carbon electrodes with energy densities much lower than lead acid batteries to 5 watt hours per kilogram vs. 25 to 35 watt hours per kilogram (5
In their study, published online August 8 in the journal Nature Communications, the CNSI researchers led by Duan used a highly interconnected 3d holey graphene framework as the electrode material to create an EC with unprecedented performance.
The electrode demonstrates superior electrical conductivity, exceptional mechanical flexibility and unique hierarchical porosity, ensuring the efficient transport of electrons
Furthermore, the team has shown that a fully packaged EC exhibits unparalleled energy densities of 35 watt hours per kilogram (49 watt hours per liter) bout five to 10 times higher than current commercial supercapacitors and on a par
"The holey grahene EC bridges the energy density gap between traditional capacitors and batteries, yet with vastly higher power density,"Duan said."
#On the frontiers of cyborg science No longer just fantastical fodder for sci-fi buffs, cyborg technology is bringing us tangible progress toward real-life electronic skin, prosthetics and ultraflexible circuits.
pioneering scientists are working on the seamless marriage between electronics and brain signaling with the potential to transform our understanding of how the brain worksnd how to treat its most devastating diseases.
ultraflexible electronics into the brain and allow them to become fully integrated with the existing biological web of neurons.
It is hoped the material can be used to coat the electrodes of supercapacitorslectrochemical components that can store extremely large amounts of electrical energyhilst also offering a solution to the growing environmental problem caused by used-cigarette filters.
Carbon is the most popular material that supercapacitors are composed of due to its low cost high surface area high electrical conductivity and long term stability.
A high-performing supercapacitor material should have a large surface area which can be achieved by incorporating a large number of small pores into the material continued Professor Yi.
which is an essential property in a supercapacitor for the fast charging and discharging. Once fabricated the carbon-based material was attached to an electrode
and tested in a three-electrode system to see how well the material could adsorb electrolyte ions (charge) and then release electrolyte ions (discharge).
The material stored a higher amount of electrical energy than commercially available carbon and also had a higher amount of storage compared to graphene
Nano-supercapacitors for electric cars More information: Preparation of energy storage material derived from a used cigarette filter for a supercapacitor electrode Nanotechnology iopscience. iop. org/0957-4484/25/34/345601 5
#Nanoscale biodegradable drug-delivery method could provide a year or more of steady doses About one in four older adults suffers from chronic pain.
At the Vienna University of Technology, Thomas Mueller, Marco Furchi and Andreas Pospischil have managed to create a semiconductor structure consisting of two ultra-thin layers,
Now, this semiconductor has successfully been combined with another layer made of molybdenum disulphide, creating a designer-material that may be used in future low-cost solar cells.
His team was the first to combine two different ultra-thin semiconductor layers and study their optoelectronic properties.
Tungsten diselenide is a semiconductor which consists of three atomic layers. One layer of tungsten is sandwiched between two layers of selenium atoms."
"We had already been able to show that tungsten diselenide can be used to turn light into electric energy
But a solar cell made only of tungsten diselenide would require countless tiny metal electrodes tightly spaced only a few micrometers apart.
metallic electrodes can be used, through which the charge is sucked away -or a second material is added."
#Surprise discovery could see graphene used to improve health (Phys. org) chance discovery about the'wonder material'graphene already exciting scientists because of its potential uses in electronics,
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