Grolltex announces new CVD graphene facility

Aug 18, 2017

Grolltex logo imageGrolltex, a U.S-based advanced materials and equipment company, recently announced a large-capacity commercial lab for production of high quality CVD graphene. Grolltex states that it is now manufacturing the material in its new class 1000 clean room, producing both raw graphene as well as products made from the material, like sensors, perovskite solar cells, display materials and X-ray windows for use in spacecraft.

The new Grolltex graphene facility is said to be capable of producing large high-quality sheets of graphene for commercial sale. The Company is said to have a patented methodology to manufacture the material in a novel way that yields lower-cost materials of high quality. Grolltex leverages graphene research and patents developed at nearby University of California, San Diego.

A new method may enable growing high-quality large graphene sheets

Aug 06, 2017

Researchers from Korea and China have developed a method to synthesize large sheets of monolayer single-crystal graphene.

New method grown large graphene sheets image

Polycrystalline graphene is formed by randomly oriented graphene islands, which decreases its quality. Currently, scientists can grow meter-sized polycrystalline graphene and smaller sizes of the usually higher-quality single-crystal graphene, ranging from 0.01 mm2 to a few square centimeters. The synthesis of large single-crystal graphene at a low cost is considered a desirable goal. In this study, the team reported the synthesis of a large sheet of monolayer single-crystal graphene.

Researchers produce robust graphene-based catalyst to split water into hydrogen and oxygen

Jul 27, 2017

Scientists at Rice University and the University of Houston have developed a catalyst that can simplify the splitting of water into hydrogen and oxygen to produce clean energy. The electrolytic film is a three-layer structure of nickel, graphene and a compound of iron, manganese and phosphorus. The foamy nickel gives the film a large surface, the conductive graphene protects the nickel from degrading and the metal phosphide carries out the reaction.

Rice  team produces robust catalyst to split water into hydrogen, and oxygen image

The film was developed to overcome barriers that usually make a catalyst good for producing either oxygen or hydrogen, but not both simultaneously - as is often the case with regular metals. The team explained that normally, a hydrogen evolution reaction is done in acid and an oxygen evolution reaction is done in base. This work produced one material that is stable whether it's in an acidic or basic solution. In addition, the team used rather common materials in lieu of the usually-required platinum and other costly materials.

MIT team uses graphene to create improved membranes

Jun 29, 2017

Researchers from MIT have fabricated a functional dialysis membrane from a sheet of graphene. The team’s membrane is able to filter out nanometer-sized molecules from aqueous solutions up to 10 times faster than state-of-the-art membranes, with the graphene itself being up to 100 times faster. The graphene membrane is also very thin; It's less than 1 nanometer thick, while the thinnest existing membranes are about 20 nanometers thick.

MIT's graphene membrane image

Dialysis can be generally described as the process by which molecules filter out of one solution by diffusing through a membrane, into a more dilute solution. The most recognizable form is hemodialysis, which removes waste from blood, but scientists also use dialysis for many other applications, like purifying drugs, removing residue from chemical solutions, and more, typically by allowing the materials to pass through a porous membrane.

Graphene and quantum dots enable a unique CMOS-integrated camera

May 30, 2017

Researchers from the ICFO have developed the first graphene-QDs-CMOS integrated camera, capable of imaging visible and infrared light at the same time. The camera may be useful for many applications like night vision, food inspection, fire control, vision under extreme weather conditions, and more.

The imaging system is said to be based on the first monolithic integration of graphene and quantum dot photodetectors, with a CMOS (complementary metal-oxide semiconductors) read-out integrated circuit. The implementation of such a platform in applications other than microcircuits and visible light cameras has been impeded by the difficulty to combine semiconductors other than silicon with CMOS, an obstacle that has been overcome in this work.

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