Often touted as a wonder material, graphene is a one-atom thick layer of carbon with remarkable, record breaking properties. Until now its ability to absorb electromagnetic radiation – energy from across the radio frequency spectrum – was not known.
Publishing in the journal Scientific Reports, the scientists demonstrated that the transparent material increased the absorption of electromagnetic energy by 90 per cent at a wide bandwidth.
"The technological potential of graphene is well-known. This paper demonstrates one example of how that potential can translate into a practical application," said Yang Hao, co-author of the study and Professor of Antennas and Electromagnetics at Queen Mary's School of Electronic Engineering and Computer Science.
"The transparent material could be added as a coating to car windows or buildings to stop radio waves from travelling through the structure. This, in turn, could be used to improve secure wireless network environments, for example."
The researchers placed a stack of layers of graphene supported by a metal plate and the mineral quartz to absorb the signals from a millimetre wave source, which allows the efficient control of wave propagation in complex environments.
Co-author Bian Wu, who is at Queen Mary from Xidian University in China on a scholarship from China Scholarship Council, added: "The stacking configuration gives us better control of the interaction between radio waves and the graphene."
The group is now developing prototypes like wireless networks, which are aimed to take the graphene from lab-based research to engineering applications.
Sian Halkyard | EurekAlert!
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Heavy construction machinery is the focus of Oak Ridge National Laboratory’s latest advance in additive manufacturing research. With industry partners and university students, ORNL researchers are designing and producing the world’s first 3D printed excavator, a prototype that will leverage large-scale AM technologies and explore the feasibility of printing with metal alloys.
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Friction stir welding is a still-young and thus often unfamiliar pressure welding process for joining flat components and semi-finished components made of light metals.
Scientists at the University of Stuttgart have now developed two new process variants that will considerably expand the areas of application for friction stir welding.
Technologie-Lizenz-Büro (TLB) GmbH supports the University of Stuttgart in patenting and marketing its innovations.
Friction stir welding is a still-young and thus often unfamiliar pressure welding process for joining flat components and semi-finished components made of...
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The Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP has been developing various applications for OLED microdisplays based on organic semiconductors. By integrating the capabilities of an image sensor directly into the microdisplay, eye movements can be recorded by the smart glasses and utilized for guidance and control functions, as one example. The new design will be debuted at Augmented World Expo Europe (AWE) in Berlin at Booth B25, October 18th – 19th.
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With the help of artificial intelligence, chemists from the University of Basel in Switzerland have computed the characteristics of about two million crystals made up of four chemical elements. The researchers were able to identify 90 previously unknown thermodynamically stable crystals that can be regarded as new materials. They report on their findings in the scientific journal Physical Review Letters.
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