Manipulating electron spin in graphene may enable ambient-temperature FETs

Jul 09, 2017

Researchers at Chalmers University, affiliated with the Graphene Flagship, have devised a graphene-based spin field-effect transistor with the ability to function at room temperature. The team used the spin of electrons in graphene and similar layered material heterostructures to fabricate working devices in a step towards combining memory devices and the logic of spintronics.

Graphene spintronics FETs image

The researchers demonstrated that the spin characteristics of graphene can be electrically regulated in a controlled way, even at an ambient temperature. In addition to possibly unlocking various probabilities in spin logic operations, this study also enables integration with magnetic memory elements in a device unit. If further advancements can assist in the production of a spin current without the need for charge flow, the amount of power needed will be considerably reduced, resulting in highly versatile devices.

Researchers design a spray-on sensing technology that detects structural integrity

Jul 09, 2017

A team of researchers from Hong Kong Polytechnic University (PolyU) has developed sensors which can be sprayed directly onto flat or curved surfaces. The sensors, made from a hybrid of carbon black (CB), graphene, other conductive nano-scale particles, and polyvinylidene fluoride (PVDF), can be networked to extract rich real-time information on the health status of the structure being monitored.

The technology includes a sensor network with a number of the sprayed nanocomposite sensors and an ultrasound actuator to actively detect the health condition of the structure to which they are fixed. When the ultrasound actuator emits guided ultrasonic waves (GUWs), the sensors will receive and measure the waves. If damage is detected, such as a crack in the structure, propagation of GUWs will be interfered by the damage, leading to the wave scattering phenomena to be captured by the sensor network. The damage can then be characterised quantitatively and accurately.

Zolo launched crowdfunding campaign for graphene-enhanced earphones

Jul 04, 2017

Anker’s audio brand, Zolo, has launched a Kickstarter campaign for its Liberty+, a pair of graphene-enhanced fully wireless earphones. The campaign has already surpassed $600,000 at the time of writing, charging past its $50,000 goal with a over 30 days left to go.

Zolo's graphene-enhanced earphones image

The use of “graphene-augmented drivers” for the Liberty+ is interesting, and could theoretically yield excellent audio quality. In addition the the graphene boost, the Liberty will also include an AI assistant integration to control your music playback through voice commands, as well as provide information on weather, news alerts, traffic updates, and more. Zolo says they’ll be compatible with Siri, Alexa, Google Assistant, and Cortana. Some other features are intriguing, like its battery life and connectivity.

Graphene-based tags will assist in the war against counterfeiting

Jul 04, 2017

Researchers at Lancaster University’s tech start-up Quantum Base are working on a graphene-based identity tag that can be scanned using a smartphone, to provide a possible solution to the fake goods problem that is causing worldwide financial damage on a grand scale.

Graphene-based identity tags image

The researchers, who are showcasing their work at the Royal Society’s Summer Science Exhibition, have designed a tag that can be verified by the end user using a smartphone. While other authenticity identifiers exist, like holograms, security inks and chemical or physical markers, this new system relies on graphene to make it unique. The team explains that the 2D nature of graphene means that even the tiniest imperfections, caused by the smallest of changes in the structure of an atom, can be identified. It also makes replicating the tag hard for fraudsters, if not impossible.

Chinese team develops a simple method to create efficient graphene-based supercapacitors

Jul 04, 2017

Chinese researchers have reportedly developed a simple "one-step method" for fabricating micro-supercapacitors and demonstrated that the final devices exhibit a very good overall performance, including a high power density (1500 mW/cm3) as well as an energy density (11.6 mWh/cm3) that is at least twice as high as similar micro-supercapacitors.

Chinese team develops novel graphene-based supercapacitors

An important step in fabricating these new micro-supercapacitor is integrating phosphorene nanosheets into the interlayer of graphene nanosheets, and the good performance is in large part due to the synergistic combination of these two materials. The different materials have complementary effects, with the phosphorene offering a high storage capacity and preventing the graphene sheets from unwanted stacking, while the graphene forms the main skeleton and offers a high-speed electron transport network.