Category Physics

Electrical characteristics of graphene-azobenzene hybrid materials.(a) Scheme of the two-terminal device. (b) Reversible current modulation as a response to the device irradiation with different wavelengths (cycles of UV and visible light). (c) Scheme of the hybrid graphene–azobenzene structure when exposed to cycles of UV and visible light. Credit: Image courtesy of Graphene Flagship

Imagine a world where you can tailor the properties of graphene to have the outcome you desire. By combining its unique properties with the precision of molecular chemistry, scientists from Graphene Flagship have taken the first steps towards doing just that...

Three-dimensional network structure of the highly porous and flexible material DUT-49 (DUT= Dresden University of Technology) which displays the NGA-effect. Credit: Image courtesy of Technische Universitaet Dresden

Prof. Dr. Stefan Kaskel et al have found a new phenomenon in the field of gas-solid interactions: the so-called Negative Gas Adsorption (NGA). Adsorption refers to the process by which molecules of a gas collect on the surface of a solid. Metal-organic frameworks are highly porous materials which are widely used for adsorptive applications such as in the reduction of pollutant emissions.

The scientists from Dresden, Berlin and France have now succeeded in demonstrating that these materials can dynamically change their structures...

A microchip that filters out unwanted radiation with the help of graphene has been developed by scientists from the EPFL and tested by researchers of the University of Geneva (UNIGE). The invention could be used in future devices to transmit wireless data ten times faster.

“Our graphene based microchip is an essential building block for faster wireless telecommunications in frequency bands that current mobile devices cannot access,” says EPFL scientist Michele Tamagnone. Their microchip works by protecting sources of wireless data from unwanted radiation, ensuring that the data remain intact by reducing source corruption.

They discovered that graphene can filter out radiation in much the same way as polarized glasses. The vibration of radiation has an orientation...

In order to allow rain to produce electricity as well, the research team coated a solar cell with a whisper-thin film of graphene. Credit: Copyright Angewandte Chemie International Edition; courtesy of ResearchSEA

Many advances have made solar cells quite efficient and affordable but a disadvantage is that solar cells produce no power when it’s raining. This may change, however. Chinese researchers have now introduced a new approach for making an all-weather solar cell that is triggered by both sunlight and raindrops. They developed a highly efficient dye-sensitized solar cell. In order to allow rain to produce electricity as well, they coated this cell with a whisper-thin film of graphene.

Graphene can readily be prepared by the oxidation, exfoliation, and subsequent reduction of graphite...