文章资讯
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- 2015-06-02 Turning graphite into diamond
- A research team led by SLAC scientists has uncovered a potential new route to produce thin diamond films for a variety of industrial applications, from cutting tools to electronic devices to electrochemical sensors.
The scientists added a few layers of graphene – one-atom thick sheets of graphite – to a metal support and exposed the topmost layer to hydrogen. To their surprise, the reaction at the surface set off a domino effect that altered the structure of all the graphene layers from graphite-like to diamond-like. - See Details
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- 2015-06-01 Heat-conducting polymer cools hot electronic devices at 200 degrees Celsius
- Polymer materials are usually thermal insulators. But by harnessing an electropolymerization process to produce aligned arrays of polymer nanofibers, researchers have developed a thermal interface material able to conduct heat 20 times better than the original polymer. The modified material can reliably operate at temperatures of up to 200 degrees Celsius.
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- 2015-06-01 Samsung adding anti-theft solutions to smartphones
- Samsung Electronics is adding two safeguards to its latest smartphone in an effort to deter rampant theft of the mobile devices.
The features announced Friday by the world's leading mobile-phone maker will protect the Samsung Galaxy 5 S, which goes on sale next week. The models sold by wireless carriers Verizon Wireless and U.S. Cellular will include "Find My Mobile" and "Reactivation Lock" anti-theft options that users can activate for free. - See Details
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- 2015-06-01 Breakthrough synthesis method to speed commercialization of graphene
- Samsung Electronics announced a breakthrough synthesis method to speed the commercialization of graphene, a unique material ideally suited for electronic devices. Samsung Advanced Institute of Technology (SAIT), in partnership with Sungkyunkwan University, became the first in the world to develop this new method.
"This is one of the most significant breakthroughs in graphene research in history," said the laboratory leaders at SAIT's Lab. "We expect this discovery to accelerate the commercialization of graphene, which could unlock the next era of consumer electronic technology." - See Details
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- 2015-06-01 Scientists develop novel, ultra-fast electrical circuits using light-generated tunneling currents
- Scientists in Singapore have successfully designed and fabricated electrical circuits that can operate at hundreds of terahertz frequencies, which is tens of thousands times faster than today's state-of-the-art microprocessors. This scientific breakthrough has the potential to revolutionise high-speed electronics, nanoscale opto-electronics and nonlinear optics.
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- 2015-06-01 Wireless power transfer achieved at five-meter distance
- The way electronic devices receive their power has changed tremendously over the past few decades, from wired to non-wired. Users today enjoy all kinds of wireless electronic gadgets including cell phones, mobile displays, tablet PCs, and even batteries. The Internet has also shifted from wired to wireless. Now, researchers and engineers are trying to remove the last remaining wires altogether by developing wireless power transfer technology.
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- 2015-06-01 'Exotic' material is like a switch when super thin
- Ever-shrinking electronic devices could get down to atomic dimensions with the help of transition metal oxides, a class of materials that seems to have it all: superconductivity, magnetoresistance and other exotic properties. These possibilities have scientists excited to understand everything about these materials, and to find new ways to control their properties at the most fundamental levels.
Researchers from Cornell and Brookhaven National Laboratory have shown how to switch a particular transition metal oxide, a lanthanum nickelate (LaNiO3), from a metal to an insulator by making the material less than a nanometer thick. - See Details
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- 2015-06-01 Fundamental research in phonon scattering helps scientists design graphene materials for applications
- Graphene, a one-atom-thick form of the carbon material graphite, has been hailed as a wonder material—strong, light, nearly transparent and an excellent conductor of electricity and heat—and it very well may be. But a number of practical challenges must be overcome before it can emerge as a replacement for silicon and other materials in microprocessors and next-generation energy devices.
One particular challenge concerns the question of how graphene sheets can be utilized in real devices. - See Details
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- 2015-06-01 Beyond graphene: Controlling properties of 2D materials
- Researchers at The University of Manchester have shown how they can control the properties of stacks of two-dimensional materials, opening up opportunities for new, previously-unimagined electronic devices.
The isolation of graphene at the University in 2004 led to the discovery of many other 2D crystals. While graphene has an unrivalled set of superlatives, these crystals cover a large range of properties: from the most conductive to isolating, from transparent to optically active. - See Details
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- 2015-06-01 A glassy look for manganites: Observing glass-like behavior in the electron-spins of PCMO crystals
- Manganites – compounds of manganese oxides - show great promise as "go-to" materials for future electronic devices because of their ability to instantly switch from an electrical insulator to a conductor under a wide variety of external stimuli, including magnetic fields, photo-excitations and vibrational excitations. This ultrafast switching arises from the many different ways in which the electrons and electron-spins in a manganite may organize or re-organize in response to such external stimuli.
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- 2015-06-01 Edgy look at 2-D molybdenum disulfide
- The drive to develop ultrasmall and ultrafast electronic devices using a single atomic layer of semiconductors, such as transition metal dichalcogenides, has received a significant boost. Researchers with the Lawrence Berkeley National Laboratory (Berkeley Lab) have recorded the first observations of a strong nonlinear optical resonance along the edges of a single layer of molybdenum disulfide.
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- 2015-05-30 Nanoengineers develop basis for electronics that stretch at the molecular level
Nanoengineers at the University of California, San Diego are asking what might be possible if semiconductor materials were flexible and stretchable without sacrificing electronic function?
Today's flexible electronics are already enabling a new generation of wearable sensors and other mobile electronic devices. But these flexible electronics, in which very thin semiconductor materials are applied to a thin, flexible substrate in wavy patterns and then applied to a deformable surface such as skin or fabric, are still built around hard composite materials that limit their elasticity.
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- 2015-05-30 Flexible all-carbon electronics integrated onto plants, insects, and more
Carbon-based electronics are being widely explored due to their attractive electrical and mechanical properties, but synthesizing them in large quantities at low cost is still a challenge.
Now in a new study, researchers have developed a new method for synthesizing entire integrated all-carbon electronic devices, including transistors, electrodes, interconnects, and sensors, in a single step, greatly simplifying their formation. The inexpensive electronic devices can then be attached to a wide variety of surfaces, including plants, insects, paper, clothes, and human skin.
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- 2015-05-30 Research in phonon scattering sheds more light on graphene as a replacement for silicon
Graphene, a one-atom-thick form of the carbon material graphite, has been hailed as a wonder material—strong, light, nearly transparent, and an excellent conductor of electricity and heat. But a number of practical challenges must be overcome before it can emerge as a replacement for silicon and other materials in microprocessors and next-generation energy devices.
One particular challenge concerns the question of how graphene sheets can be used in real devices.
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- 2015-05-30 Energy device for flexible electronics packs a lot of power
While flexible gadgets such as "electronic skin" and roll-up touch screens are moving ever closer to reality, their would-be power sources are either too wimpy or too stiff. But that's changing fast. Scientists have developed a new device that's far thinner than paper, can flex and bend, and store enough energy to provide critical back-up power for portable electronics.
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- 2015-05-30 HomeBiologyPlants & AnimalsMay 7, 2014
Radio waves disrupt the magnetic "compass" in robins, according to a study published on Wednesday that is likely to fuel debate about the safety of electronic devices.
In a long and careful experiment, German scientists found that migrating robins became disorientated when exposed to electromagnetic fields at levels far lower than the safety threshold for humans.
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- 2015-05-30 Research promises to lead to increased functionality for advanced mobile devices
University of California, Berkeley researchers sponsored by Semiconductor Research Corporation, are pursuing a novel approach to 3D device integration that promises to lead to advanced mobile devices and wearable electronics featuring increased functionality in more low-profile packages.
The research focuses on integrating extra layers of transistors on a vertically integrated 3D monolithic chip using printing of semiconductor "inks" as compared to the current method of chip-stacking through 3D interconnect solutions.
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- 2015-05-30 Transistors that wrap around tissues: New implanted devices may reshape medicine
Researchers from The University of Texas at Dallas and the University of Tokyo have created electronic devices that become soft when implanted inside the body and can deploy to grip 3-D objects, such as large tissues, nerves and blood vessels.
These biologically adaptive, flexible transistors might one day help doctors learn more about what is happening inside the body, and stimulate the body for treatments.
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- 2015-05-30 Exploring heat and energy at the smallest scales
In a recent experiment at SLAC's Stanford Synchrotron Radiation Lightsource (SSRL), scientists "tickled" atoms to explore the flow of heat and energy across materials at ultrasmall scales. The experiment, detailed in the May 6 edition of Structural Dynamics, enabled them to see subtle light-driven changes in the atomic structure of thin materials, relevant to thermoelectric and electronic devices.
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- 2015-05-30 Team made great improvements of nanogenerator power efficiency
Nanogenerators are innovative self-powered energy harvesters that convert kinetic energy created from vibrational and mechanical sources into electrical power, removing the need of external circuits or batteries for electronic devices. This innovation is vital in realizing sustainable energy generation in isolated, inaccessible, or indoor environments and even in the human body.
Nanogenerators, a flexible and lightweight energy harvester on a plastic substrate, can scavenge energy from the extremely tiny movements of natural resources and human body such as wind, water flow, heartbeats, and diaphragm and respiration activities to generate electrical signals.
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- 2015-05-30 A new class of recyclable thermoset plastics
Plastics comprise around 10% of solid waste in Australia. And while we can recycle certain types, there is a group of particularly stable plastics called thermosets, common in electronic devices, which can't be broken down and recycled – until now.
In a paper published in Science today, researchers describe a way to manufacture recyclable thermosets, thus allowing the plastics to be broken down and reformed.
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- 2015-05-29 Geneva scientists focus on phone cameras for random number generation
- A paper submitted on May 2 to arXiv begins its discussion by noting that quantum random number generators (QRNGs) can improve the security of cryptographic protocols by ensuring that generated keys cannot be predicted, The paper is the work of four scientists from the Group of Applied Physics at the University of Geneva. Bruno Sanguinetti, Anthony Martin, Hugo Zbinden and Nicolas Gisin have shown how random numbers can be extracted from an illuminated image sensor.
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- 2015-05-29 Physicists investigate onset of effective mass
- Although mass may seem to be a fairly straightforward concept, from a physics perspective it can be much more complex than weighing an object and reading off a number in grams. For instance, an object's mass can be modified by putting it in a different medium.
The familiar type of mass, also called the "inertial mass" or "bare mass," is afundamental property of an object that is determined by an object's resistance to acceleration when subject to a force, for example gravity. - See Details
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- 2015-05-29 CEO: Sony needed to act sooner, but will reform (Update)
- Sony Corp. Chief Executive Kazuo Hirai said Thursday the company accumulated huge losses because it didn't respond quickly enough to changing market conditions, but promised a return to profit next year.
Last week, Sony reported a 128.4 billion yen ($1.3 billion) loss for the fiscal year ended March. It is forecasting a 50 billion yen ($490 million) loss for the current fiscal year. Sony has repeatedly disappointed investors by not achieving its profit forecasts. - See Details
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- 2015-05-29 Researchers find a way to integrate two two-dimensional materials into a single electronic device
- Researchers working at the Massachusetts Institute of Technology have found a way to integrate two different two-dimensional materials in one single electronic device. In their paper published in the journal Nano Letters, the team describes how they used both graphene and molybdenum disulfide (MoS2) to create a single circuit.
Two dimensional materials (so named because they are just one atom thick) have created a lot of buzz in the electronics community because of their unique electronic properties. Scientists hope to use them to create smaller, more efficient devices. The two main materials that have captured the attention of the research world are graphene (a sheet of carbon) and MoS2. - See Details
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- 2015-05-29 Electrical cables that store energy? New nanotech may provide power storage in electric cables, clothes
- Imagine being able to carry all the juice you needed to power your MP3 player, smartphone and electric car in the fabric of your jacket?
Sounds like science fiction, but it may become a reality thanks to breakthrough technology developed at a University of Central Florida research lab. - See Details
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- 2015-05-29 2D transistors promise a faster electronics future
- Faster electronic device architectures are in the offing with the unveiling of the world's first fully two-dimensional field-effect transistor (FET) by researchers with the Lawrence Berkeley National Laboratory (Berkeley Lab). Unlike conventional FETs made from silicon, these 2D FETs suffer no performance drop-off under high voltages and provide high electron mobility, even when scaled to a monolayer in thickness.
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- 2015-05-29 Silicon alternatives key to future computers, consumer electronics
- Researchers are reporting key milestones in developing new semiconductors to potentially replace silicon in future computer chips and for applications in flexible electronics.
Findings are detailed in three technical papers, including one focusing on a collaboration of researchers from Purdue University, Intel Corp. and SEMATECH, a consortium dedicated to advancing chip manufacturing. The team has demonstrated the potential promise of an extremely thin - or "two-dimensional" - semiconductor called molybdenum disulfide. - See Details
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- 2015-05-29 Boom in electronic gadgets prompts libraries to offer more ebooks
- Are iPads sending people to their local public library? Sunnyvale, Calif., official Lisa Rosenblum thinks so.
Just last week, Rosenblum said, she was approached at the city library by a middle-aged resident who admitted he hadn't visited there for years. The man was applying for a library card because he'd bought a new iPad and wanted to borrow electronic books. - See Details
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- 2015-05-29 Funky ferroelectric properties probed with X-rays
- Ferroelectric materials like barium titanate, a ceramic used in capacitors, are essential to many electronic devices. Typical ferroelectric materials develop features called domain walls with unusual properties – such as lines of electrical conduction completely different from the surrounding material. These properties are technologically useful but poorly understood.
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