The latest graphene sensor news:
Novel device architecture based on graphene Schottky diode varactors shows potential for optoelectronics applications
Researchers from Bar-Ilan University in Israel and Yale University in the U.S have reported on a novel device architecture comprising graphene Schottky diode varactors. The team assessed that such devices have great potential for optoelectronics applications.
The team has shown that graphene varactor diodes exhibit significant advantages compared with existing graphene photodetectors, including elimination of high dark currents and enhancement of the external quantum efficiency (EQE).
Project "HEA2D", which started in 2016 and set out to investigate the production, qualities, and applications of 2D nanomaterials, recently demonstrated end-to-end processing chain of two-dimensional nanomaterials. The project is a collaboration between AIXTRON, AMO, Coatema, Fraunhofer and Kunststoff-Institut für die mittelständische Wirtschaft (K.I.M.W.).
It was stated that the "HEA2D" consortium successfully demonstrated an end-to-end processing chain of two-dimensional nanomaterials as part of its results. 2D materials integrated into mass production processes have the potential to create integrated and systemic product and production solutions that are socially, economically and ecologically sustainable. Application areas for the technologies developed and materials investigated in this project are mainly composite materials and coatings, highly sensitive sensors, power generation and storage, electronics, information and communication technologies as well as photonics and quantum technologies.
UK-based graphene technology company Paragraf has announced the close of its £12.8 million (over $16 million USD ) Series A round led by Parkwalk. The round also included investment from IQ Capital Partners, Amadeus Capital Partners and Cambridge Enterprise, the commercialization arm of the University of Cambridge, as well as several angel investors. The funding will aim to see Paragraf’s first graphene-based electronics products reach the market, transitioning the company into a commercial, revenue-generating entity.
Paragraf sets out to deliver IP-protected graphene technology using standard, mass production scale manufacturing approaches, enabling step-change performance enhancements to today’s electronic devices. The company’s first sensor products have reportedly demonstrated order of magnitude operational improvements over today’s incumbents. Achieving large-scale, graphene-based production technology may enable next generation electronics, including vastly increased computing speeds, significantly improved medical diagnostics and higher efficiency renewable energy generation as well as currently unachievable products such as instant charging batteries and very low power, flexible electronics.
Researchers at the U.S-based University of Rochester, along with colleagues at Delft University of Technology in the Netherlands, have designed a way to produce graphene materials using a novel technique: mixing oxidized graphite with bacteria. Their method is reportedly a more cost-efficient, time-saving, and environmentally friendly way of producing graphene materials versus those produced chemically, and could lead to the creation of innovative computer technologies and medical equipment.
"For real applications you need large amounts," says Anne S. Meyer, an associate professor of biology at the University of Rochester. "Producing these bulk amounts is challenging and typically results in graphene that is thicker and less pure. This is where our work came in". In order to produce larger quantities of graphene materials, Meyer and her colleagues started with a vial of graphite. They exfoliated the graphite-shedding the layers of material-to produce graphene oxide (GO), which they then mixed with the bacteria Shewanella. They let the beaker of bacteria and precursor materials sit overnight, during which time the bacteria reduced the GO to a graphene material.
Researchers from the Moscow Institute of Physics and Technology (MIPT) and Valiev Institute of Physics and Technology in Russia have demonstrated resonant absorption of terahertz radiation in commercially available graphene. The team declared this to be an important step toward designing efficient terahertz detectors, which would enable faster internet and a safe replacement for X-ray body scans.
THz radiation, also known as T-waves, is considered difficult to generate and detect. This gave rise to the notion of a “terahertz gap,” which roughly refers to the 0.1-10 THz frequency band in the electromagnetic spectrum. There are no efficient devices for generating and detecting radiation in this range. Nevertheless, T-waves are very important for humanity: They do not harm the body and so could replace X-rays in medical scans. Also, T-waves could make Wi-Fi much faster and open the door to astronomical research that is thus far untapped .