The Fraunhofer IWS has made another important step forward with respect to the research on n-conductive polymers for printed electronics. The Dresden scientists succeeded in modifying an n-conductive polymer, already synthesized in 2015, in such a way that it can now be processed as a paste and be printed in a three-dimensional manner.
At first sight, for many people conductive polymers are paradox, in particular, when we think of those plastics we are surrounded by in everyday life. Nevertheless conductive polymers are already used in many technical applications, e.g. batteries, LCD screens, transistors and solar cells.
Actually it has already been known in the eighties that the electrical conductivity of polymers may reach that of metals. In 2000, the Nobel Prize for Chemistry was awarded exactly for this discovery.
The main difference between polymers and metals is the fact that in the case of metal, electrons are responsible for the electrical conduction process. However, in commercially available polymers (e.g. PEDOT: PSS) charge carriers with positive elementary charge are responsible for electrical conductivity (p-conductivity).
The design of completely electronical components requires p-conductive as well as n-conductive material. N-conductive polymers are often the famous bottleneck in many technical applications. Often they show poor electrical conductivity and structural integri-ty. Both properties strongly suffer from degradation due to environmental influences.
In 2015, however, the IWS group “Printing” successfully synthesized an n-type polymer with an enhanced conductivity of one order of magnitude (compared to the values in literature of other n-conductive polymers, http://www.iws.fraunhofer.de/en/pressandmedia/press_releases/2015/press_release_...).
Nevertheless, applications of n-conductive polymers had to face further challenges. Similar to its p-type archetype PEDOT, the IWS-developed polymer was also almost insoluble in all known solutions. This challenge has been mastered now! For the very first time a thermoelectric generator (a device which is able to generate electrical power) has been designed and tested. The Dresdner scientists are going to present their results at the “14th European Conference on Thermoelectrics” in Lisbon.
Material development, system design and manufacturing technologies of thermoelectric generators will be important topics of the workshop “Energy Harvesting Systems – FlexTEG“, taking place at the Fraunhofer IWS Dresden on September 26 - 27, 2016. Please find further information at: http://www.iws.fraunhofer.de/flexteg.
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS Dresden
01277 Dresden, Winterbergstr. 28
Phone: +49 351 83391-3092
Fax: +49 351 83391-3300
Dr. Ralf Jäckel
Phone: +49 351 83391-3444
Fax: +49 351 83391-3300
Dr. Ralf Jaeckel | Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS
Improved stability of plastic light-emitting diodes
19.04.2018 | Max-Planck-Institut für Polymerforschung
Intelligent components for the power grid of the future
18.04.2018 | Christian-Albrechts-Universität zu Kiel
At the Hannover Messe 2018, the Bundesanstalt für Materialforschung und-prüfung (BAM) will show how, in the future, astronauts could produce their own tools or spare parts in zero gravity using 3D printing. This will reduce, weight and transport costs for space missions. Visitors can experience the innovative additive manufacturing process live at the fair.
Powder-based additive manufacturing in zero gravity is the name of the project in which a component is produced by applying metallic powder layers and then...
Physicists at the Laboratory for Attosecond Physics, which is jointly run by Ludwig-Maximilians-Universität and the Max Planck Institute of Quantum Optics, have developed a high-power laser system that generates ultrashort pulses of light covering a large share of the mid-infrared spectrum. The researchers envisage a wide range of applications for the technology – in the early diagnosis of cancer, for instance.
Molecules are the building blocks of life. Like all other organisms, we are made of them. They control our biorhythm, and they can also reflect our state of...
University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.
Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.
Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.
Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...
Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.
The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...
13.04.2018 | Event News
12.04.2018 | Event News
09.04.2018 | Event News
24.04.2018 | Life Sciences
24.04.2018 | Materials Sciences
24.04.2018 | Trade Fair News