Few methods are able to analyze single molecules. Analysis problems occur due to the instability of thin molecular layers and especially single molecules with respect to their thermal-, chemical- and photo-degradation or to external mechanical fields caused scanning probe techniques. A disadvantage of Raman scattering methods is the large amount of heat produced by the focused plasmons localized at the active site, which can cause damage of the molecules. Graphene exhibits plasmon resonance in the ultraviolet and blue spectral region and thus can enhance Raman signals. Graphene is a monoatomically thick and flexible layer, which provides thermal and electrical conductivity as well as high optical transparency and impermeability to gases and liquids. Thus graphene can act as protective layer against local heating.<br><br> <!--break--><strong>Technology</strong><br> This novel method allows the analysis of substances in very small quantities, even single molecules, with common techniques. The substances to be analyzed are covered with a graphene layer. <br> <br>
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Animal photoreceptors capture light with photopigments. Researchers from the University of Göttingen have now discovered that these photopigments fulfill an...
On 15 March, the AWI research aeroplane Polar 5 will depart for Greenland. Concentrating on the furthest northeast region of the island, an international team...
The world’s second-largest ice shelf was the destination for a Polarstern expedition that ended in Punta Arenas, Chile on 14th March 2018. Oceanographers from...
At the 2018 ILA Berlin Air Show from April 25–29, the Fraunhofer Institute for Laser Technology ILT is showcasing extreme high-speed Laser Material Deposition (EHLA): A video documents how for metal components that are highly loaded, EHLA has already proved itself as an alternative to hard chrome plating, which is now allowed only under special conditions.
When the EU restricted the use of hexavalent chromium compounds to special applications requiring authorization, the move prompted a rethink in the surface...
At the ILA Berlin, hall 4, booth 202, Fraunhofer FHR will present two radar sensors for navigation support of drones. The sensors are valuable components in the implementation of autonomous flying drones: they function as obstacle detectors to prevent collisions. Radar sensors also operate reliably in restricted visibility, e.g. in foggy or dusty conditions. Due to their ability to measure distances with high precision, the radar sensors can also be used as altimeters when other sources of information such as barometers or GPS are not available or cannot operate optimally.
Drones play an increasingly important role in the area of logistics and services. Well-known logistic companies place great hope in these compact, aerial...
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