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Atomic-scale imaging achieves attosecond resolution

Nanotechweb - December 7, 2017 - 9:05am
A novel electron microscopy technique allows for picometer-scale imaging of materials with unprecedented time resolution.

Drug-loaded nanoparticles home in on endometrial cancer’s 'Achilles heel'

Nanotechweb - December 7, 2017 - 8:47am
New therapeutic technique might be readily translated to the clinic.

Neuromorphic computing tackles full circuits

Nanotechweb - December 7, 2017 - 5:15am
Circuits that emulate different aspects of synapse activity overcome some of the challenges in moving from single devices to full-scale neuromorphic systems.

Topological insulators made easy

Nanotechweb - December 6, 2017 - 7:52am
Nanoscale van der Waals heterostructures fabricated using a simple deposition technique might be exploited in future spin-selective electronics devices.

Leti Develops Low-Cost System for Improving Diagnosis and Treatment of Epilepsy: ‘Disruptive’ Magnetoencephalography System that also Lowers Costs and Enhances Scan Accuracy Wins Best Early Stage Innovation Award from European Commission

Nanotech-Now - December 6, 2017 - 7:46am
Leti, a research institute of CEA Tech, today announced it has taken a major step toward development of next-generation magnetoencephalography (MEG) that could significantly reduce the cost of MEG sys...

Fast flowing heat in graphene heterostructures: Surprisingly fast heat flow from graphene to its surrounding

Nanotech-Now - December 6, 2017 - 7:46am
Nanoscale heat flow plays a crucial role in many modern electronic and optoelectronic applications, such as thermal management, photodetection, thermoelectrics and data communication. Two-dimensional...

Deben reports on a new publication from scientists at La Trobe University in Australia where their CT500 stage is used in micro scanning tomography experiments to better understand ceramic matrix composites under load

Nanotech-Now - December 6, 2017 - 7:46am
Deben, a leading provider of in-situ testing stages together with innovative accessories and components for electron microscopy, reports on a publication in Microscopy & Microanalysis from the La Trob...

A transistor of graphene nanoribbons: Breakthrough in Nanoelectronics

Nanotech-Now - December 6, 2017 - 7:46am
Graphene ribbons that are only a few atoms wide, so-called graphene nanoribbons, have special electrical properties that make them promising candidates for the nanoelectronics of the future: While gra...

Drug-delivering nanoparticles seek and destroy elusive cancer stem cells

Nanotech-Now - December 5, 2017 - 7:46am
University of Illinois researchers are sending tiny drug-laden nanoparticles on a mission to seek and destroy cancer stem cells, the elusive and rare cells that can cause cancer to come back even when...

Graphene composite provides wireless power at your fingertips

Nanotechweb - December 4, 2017 - 9:04am
Researchers design a material for triboelectric nanogenerators that produces voltages large enough to wirelessly transmit and receive signals without additional electronics or power sources.

X-ray crystallography sheds more light on optogenetic tool

Nanotechweb - December 4, 2017 - 7:53am
Researchers determine the detailed structure of light-sensitive protein channelrhodopsin 2 for the first time.

Emmanuel Sabonnadiere is Leti’s New CEO

Nanotech-Now - December 2, 2017 - 7:46am
Leti, a technology research institute of CEA Tech, today announced that Emmanuel Sabonnadiere has been named CEO, succeeding Marie-Noelle Semeria.

Printing Flexible Graphene Supercapacitors

Nanotech-Now - December 1, 2017 - 8:50am
Graphene is being employed for ever more types of flexible products. Unfortunately, traditional microfabrication techniques limit the scalability of potentially application-ready technologies. The eco...

Nanodevice generates random numbers

Nanotechweb - December 1, 2017 - 8:46am
Superparamagnetic tunnel junctions show promise for emerging computing schemes.

Graphene oxide making any material suitable to create biosensors: Scientists from Tomsk Polytechnic University have developed a new tool for biomedical research focused on single-cell investigation

Nanotech-Now - December 1, 2017 - 7:45am
TPU scientist Raul Rodrigez and his colleagues from Lithuania and Germany were the first in the world to suggest how with the help of graphene oxide, in fact ordinary graphene as in pencils, but oxidi...

Direct writing technique creates never-before-seen states in artificial spin ice

Nanotechweb - December 1, 2017 - 6:56am
Nanowire macrospins can now be flipped on demand, producing arbitrary spin arrangements unachievable by other means

Patent for one-of-a-kind process exfoliating pure graphene

InterNano Industry News - December 1, 2017 - 4:45am
Researchers have patented a one-of-a-kind process for exfoliating graphene in its pure (unoxidized) form, as well as manufacturing innovative graphene nanocomposites that have potential uses in a variety of applications.
Categories: Nanotechnology News

A nanotechnology approach to purifying liquid crystals

InterNano Industry News - December 1, 2017 - 4:45am
Liquid crystals used in modern devices such as laptops, tablets and smartphones typically contain a small fraction of ionic contaminants. These ion contaminants can originate from multiple sources during the chemical synthesis of materials, in the process of assembling the device, and in its daily use. In the case of LCDs, mobile ions in liquid crystals lead to such undesirable effects as image sticking, image flickering, and slow response. A promising solution to reduce the concentration of mobile ions in liquid crystal devices can be found by merging liquid crystals and nanotechnology.
Categories: Nanotechnology News

Molybdenum-Disulfide 2D Transistors Go Ballistic

InterNano Industry News - December 1, 2017 - 4:45am
<?xml version="1.0" encoding="UTF-8"?> 2D nanomaterial pulls ahead with working registers and latch circuits and devices that let electrons zip through unimpeded Image: Stanford University Molybdenum disulfide, a two dimensional semiconductor that’s just 3 atoms thick, has had a big year. In October, a group of researchers made a 1-nanometer transistor from the material, showing that even if silicon transistors stop shrinking, the new material might provide a path forward. In December, at the IEEE International Electron Devices Meeting in San Francisco, researchers presented work they say shows that molybdenum disulfide not only makes for superlative single transistors, but can be made into complex circuits using realistic manufacturing methods. At the meeting, a group from Stanford showed that transistors made from large sheets of MoS2 can be used to make transistors with 10-nanometer-long, gate having electronic properties that approach the material’s theoretical limits. The devices displayed traits close to ballistic conduction, a state of very low electrical resistance that allows the unimpeded flow of charge over relatively long distances—a phenomenon that should lead to speedy circuits. Separately, a team from MIT demonstrated complex circuit elements made from MoS2 transistors. Most of the work on molybdenum disulfide so far has been what Stanford electrical engineer Eric Pop calls “Powerpoint devices.” These one-off devices, made by hand in the lab, have terrific performance that looks great in a slide. This step is an important one, says Pop, but the 2D material is now maturing. Image: Stanford University The Stanford lab’s transistors are not as small as the record-breaking ones demonstrated in October. What’s significant, says group leader Pop, is that these latest transistors maintained similar performance even though they were made using more industrial-type techniques. Instead of using Scotch tape to peel off a layer of molybdenum disulfide from a rock of the material, then carefully placing it down and crafting one transistor at a time, Pop’s grad student started by growing a large sheet of the material on a wafer of silicon. In a transistor, a gate electrode switches the semiconductor channel between conducting and insulating states. In the Stanford device, the tricky part was coming up with an easy way to make a small gate atop the molybdenum disulfide without harming it, says Pop. That is, until his student, Christopher English, realized they could harness the power of rust. English chose a somewhat unusual material, aluminum, to serve as the gate electrode. He deposited a 20-nanometer finger of aluminum on the molybdenum, then allowed it to oxidize and shrink down to a smaller size. The gate ends up being about 10 nanometers. At these relatively small dimensions, the molybdenum disulfide transistors approach their ultimate electrical limit, a state called ballistic conduction. When a device is small enough (or at low enough temperature), electrons will travel through the conducting medium without scattering because of collisions with the atoms that make up the material. Transistors operating ballistically should switch very fast and enable high-performance processors. Pop estimates that about 1 in 5 electrons moves though the rusty transistors ballistically. By further improving the quality of the material (or making the transistors smaller), he expects that ratio to improve. The important thing, he says, is the way they achieved this: using methods that could translate to larger scales. “We have all the ingredients we need to scale this up,” says Pop. Zippy nanoscale transistors are great on their own, but they’re useful only if you can build them into circuits.  Researchers from MIT demonstrated just that by constructing working registers and latches. They managed the feat, says electrical engineer Dina El-Damak, by creating computer-aided design software tailored to MoS2. This sort of software is common in the silicon world and enables designers to come up with new circuits relatively easily. (El-Damak worked on the molybdenum disulfide project at MIT and is now a professor at the University of Southern California in Los Angeles.) Since molybdenum disulfide is so new, not many circuit designers have worked with the material. So far, most work has been done by trial and error, one device at a time. The MIT group can create an informed circuit design, using their computer models to simulate the best and worst cases, based on the material’s known properties and the performance of previous devices, says El-Damak. Then the group fabricates the design that seems most likely to work, tests its performance, and feeds the results back into the program. “By doing this, we have more confidence in scaling up this technology,” she says. Both Pop and El-Damak say molybdenum disulfide is unlikely to be a direct replacement for silicon. The material will either be used to build complementary systems on top of silicon chips, or it will be used on its own in flexible, transparent electronics. It’s also possible that some other 2D semiconductor will end up being a better option. Molybdenum disulfide is a few steps ahead because researchers have worked with it more than, say, tungsten selenide, and know how to grow the material over large areas. The Stanford and MIT research demonstrates important progress in this field, says Deji Akinwande, an electrical engineer at the University of Texas at Austin who co-chaired the IEDM session on 1D and 2D devices. People who work in industry are always asking when these materials will be made into useful circuits, and now it’s happening, he says. “Industry is starting to take this more seriously, now that it’s no longer just the grad student in the basement working on it,” he says.
Categories: Nanotechnology News

Using graphene as transparent electrodes and alignment layers for liquid crystal devices

InterNano Industry News - December 1, 2017 - 4:45am
In conventional liquid crystal displays (LCD), the liquid crystal (LC) material is contained in conventional LC cells, where the polyimide layers are used to align the LC homogeneously in the cell, and the transmissive indium tin oxide (ITO) electrodes are used to apply the electric field to reorient the LC along the field. Now, researchers have experimentally demonstrated that monolayer graphene films on the two glass substrates can function concurrently as the LC alignment layers and the transparent electrodes to fabricate an LC cell, without using the conventional polyimide and ITO substrates.
Categories: Nanotechnology News