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Graphene is the world's strongest, thinnest and most conductive material, made from carbon. Graphene's remarkable properties enable exciting new applications in electronics, solar panels, batteries, medicine, aerospace, 3D printing and more!
Recent Graphene news:
Simulations suggest a liquid phase in atomically thin gold islands that patch small pores of graphene
Scientists at the Nanoscience Center at the University of Jyväskylä in Finland ran computer simulations that predict a liquid phase in atomically thin golden islands that patch small pores of graphene. According to the simulations, gold atoms flow and change places in the plane, while the surrounding graphene template retains the planarity of liquid membrane.
Liquid phase of 2D materials was considered impossible since the thermal atomic motion required for molten materials easily breaks the thin and fragile membrane. The liquid phase was predicted by computer simulations using quantum-mechanical models and nanostructures with tens or hundreds of gold atoms. The role of graphene is in setting the circular frame and the liquid state is possible when the edge of a graphene pore stretches the metallic membrane and keeps it steady.
Researchers at the Korea Advanced Institute of Science and Technology (KAIST) managed to create durable artificial muscles using a graphene electrode. Ionic polymer metal composites (IPMCs), or artificial muscles, change in size or shape when exposed to electric fields and could be extremely useful in the fields of robotics and prosthetics.
IPMC motors, (referred to as actuators), are created from a molecular membrane that is stretched between two metal electrodes. Upon applying an electric field, a redistribution of ions is caused that forces the structure to bend. These structures do not consume a lot of power and are able to mimic life-like motions. These devices, however, have a number of disadvantages like cracks that form on the metal electrodes and cause ions to leak through the electrodes and reduce performance. A possible solution to this problem is embodied in the researchers' thin electrode, based on an ionic polymer-graphene composition (IPGC). These new electrodes repel water and are very resistant to cracking. They also have a robust inner surface that allows the migration of ions within the membrane to cause bending.
Researchers at the German RWTH University and AMO GmbH Aachen fabricated highly sensitive Hall Effect sensors using single layer graphene. Graphene's very high carrier mobility at room temperature and very low carrier densities make it a material that can outperform all currently existing Hall sensor technologies.
The researchers protected the graphene from ambient contamination by encapsulating it with hexagonal boron nitride layers. The consequently fabricated devices showed a voltage and current normalized sensitivity of up to 3 V/VT and 5700 V/AT, respectively. These values are more than one order of magnitude above the values achieved in Silicon-based devices and a factor of two above the values achieved with the best III/V semiconductors Hall sensors in ambient conditions. In addition, these results are far better than the earlier reported graphene Hall sensors on Silicon oxide and Silicon carbide substrates.
In 2012, researchers from Stony Brook University established a new company called Theragnostic Technologies to develop a new efficient graphene-based MRI contrast agent that is safer and cheaper than current gadolinium-based agents.
Next month the company is set to unveil its product, the ManGraDex graphene-based MRI agent. The company says that this new contrast agent will greatly improve the MRI safety and efficacy of MRI - and will also expand the MRI market into unserved renal and cardiovascular patients.
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Researchers at MIT and the University of Michigan developed a new roll-to-roll manufacturing method, that promises to enable continuous production using a thin metal foil as a substrate, in an industrial process where the material would is deposited onto the foil as it moves from one spool to another. The resulting size of the sheets would be limited only by the width of the rolls of foil and the size of the chamber where the deposition would take place.
The new process is an adaptation of a CVD method already used at MIT (and additional places) to make graphene. The new system uses a similar vapor chemistry, but the chamber is in the form of two concentric tubes, one inside the other, and the substrate is a thin ribbon of copper that slides smoothly over the inner tube. Gases flow into the tubes and are released through precisely placed holes, allowing for the substrate to be exposed to two mixtures of gases sequentially. The first region is called an annealing region, used to prepare the surface of the substrate; the second region is the growth zone, where the graphene is formed on the ribbon. The chamber is heated to approximately 1,000 degrees Celsius to perform the reaction.
The U.S Naval Research Laboratory (NRL) and University College, London, recently purchased Oxford Instruments' plasma processing Nanofab equipment using CVD, PECVD and ICPCVD techniques.
The Nanofab enables the fabrication of nanostructured materials such as graphene, carbon nanotubes and other 1D and 2D nanomaterials. It combines several essential features for high performance growth such as a high temperature heater capable of processing up to 200 mm wafers, shower head technology, automatic load lock for wafer handling as well as flexible options for liquid/solid precursor delivery.