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Nanoplatelets are chemical systems that emit light and can be used, for example, in light diodes. Together with international colleagues, researchers at TU Dortmund University have succeeded in turning the platelets into powerful magnets, through which the properties of the light emitted by the nanoplatelets can be controlled highly accurately. The team published its results this week in the renowned journal “Nature Nanotechnology”.
In the past years, a new class of systems has been developed which are chemically relatively easy to synthesize – nanoplatelets. These are very flat structures that are only a few billionths of a meter thick but have a far greater spread in the plane. The result is that electric current can flow more or less freely in the plane, but vertically not at all.
The special thing about such structures is that they radiate a very bright light when such an electric current is introduced. This is why the intention is to use them in future in light diodes. In addition, the nanoplatelets can be produced in a very energy-efficient way from environmentally compatible materials. By selecting specific materials for the platelets and their thickness, it is even possible to vary the color of the light emitted.
However, to date only little research has been conducted into the influence of the nanoplatelets’ surface on the light. A research team led by Associate Professor Dmitri Yakovlev from the Department of Experimental Physics 2 of TU Dortmund University has now succeeded – in cooperation with colleagues from Russia, France, Belgium and Italy – in turning nanoplatelets, which are in fact non-magnetic, into powerful magnets. To achieve this, they used the surfaces on which chemically unbound charges are located. This magnetism can be used to set various properties of the light emissions from the nanoplatelets very precisely – including the speed with which the light is emitted and the polarization, i.e., the direction, in which the light wave oscillates. When producing the nanoplatelets, the surfaces have to be cut to size accordingly. The international research team published its results at the end of January in the renowned journal Nature Nanotechnology.
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Location & approach
The campus of TU Dortmund University is located close to interstate junction Dortmund West, where the Sauerlandlinie A 45 (Frankfurt-Dortmund) crosses the Ruhrschnellweg B 1 / A 40. The best interstate exit to take from A 45 is "Dortmund-Eichlinghofen" (closer to Campus Süd), and from B 1 / A 40 "Dortmund-Dorstfeld" (closer to Campus Nord). Signs for the university are located at both exits. Also, there is a new exit before you pass over the B 1-bridge leading into Dortmund.
To get from Campus Nord to Campus Süd by car, there is the connection via Vogelpothsweg/Baroper Straße. We recommend you leave your car on one of the parking lots at Campus Nord and use the H-Bahn (suspended monorail system), which conveniently connects the two campuses.
TU Dortmund University has its own train station ("Dortmund Universität"). From there, suburban trains (S-Bahn) leave for Dortmund main station ("Dortmund Hauptbahnhof") and Düsseldorf main station via the "Düsseldorf Airport Train Station" (take S-Bahn number 1, which leaves every 20 or 30 minutes). The university is easily reached from Bochum, Essen, Mülheim an der Ruhr and Duisburg.
You can also take the bus or subway train from Dortmund city to the university: From Dortmund main station, you can take any train bound for the Station "Stadtgarten", usually lines U41, U45, U 47 and U49. At "Stadtgarten" you switch trains and get on line U42 towards "Hombruch". Look out for the Station "An der Palmweide". From the bus stop just across the road, busses bound for TU Dortmund University leave every ten minutes (445, 447 and 462). Another option is to take the subway routes U41, U45, U47 and U49 from Dortmund main station to the stop "Dortmund Kampstraße". From there, take U43 or U44 to the stop "Dortmund Wittener Straße". Switch to bus line 447 and get off at "Dortmund Universität S".
Dortmund Airport offers flights to several destinations in Central Europe. There are regular connections to Katowice, Kraków, London and Munich. For the approximately 20km-trip from Dortmund Airport to TU Dortmund University, you can use a shuttle bus to the railway Station "Bahnhof Holzwickede", from which trains depart to Dortmund main station (please visit Verkehrsverbund Rhein-Ruhr for more information). Normally, the fastest way is to catch a taxi at Dortmund Airport.
The H-Bahn is one of the hallmarks of TU Dortmund University. There are two stations on Campus Nord. One ("Dortmund Universität S") is directly located at the suburban train stop, which connects the university directly with the city of Dortmund and the rest of the Ruhr Area. Also from this station, there are connections to the "Technologiepark" and (via Campus Süd) Eichlinghofen. The other station is located at the dining hall at Campus Nord and offers a direct connection to Campus Süd every five minutes.