Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Fraunhofer IWS scientists are now able to offer n-conductive polymers as processable paste

09.09.2016

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.


Printed TEG (thermoelectric generator) made of p- and n-conductive polymer and silver contact

© Fraunhofer IWS Dresden

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.

Contact:

Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS Dresden
01277 Dresden, Winterbergstr. 28
Germany

Lukas Stepien
Phone: +49 351 83391-3092
Fax: +49 351 83391-3300
E-Mail: lukas.stepien@iws.fraunhofer.de

Public Relations
Dr. Ralf Jäckel
Phone: +49 351 83391-3444
Fax: +49 351 83391-3300
E-Mail: ralf.jaeckel@iws.fraunhofer.de

Internet:
http://www.iws.fraunhofer.de und
http://www.iws.fraunhofer.de/en/pressandmedia/press_releases.html

Weitere Informationen:

http://www.iws.fraunhofer.de und
http://www.iws.fraunhofer.de/en/pressandmedia/press_releases.html
http://www.iws.fraunhofer.de/flexteg

Dr. Ralf Jaeckel | Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS

More articles from Power and Electrical Engineering:

nachricht Producing electricity during flight
20.09.2017 | Albert-Ludwigs-Universität Freiburg im Breisgau

nachricht Solar-to-fuel system recycles CO2 to make ethanol and ethylene
19.09.2017 | DOE/Lawrence Berkeley National Laboratory

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: The pyrenoid is a carbon-fixing liquid droplet

Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.

A warming planet

Im Focus: Highly precise wiring in the Cerebral Cortex

Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.

The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...

Im Focus: Tiny lasers from a gallery of whispers

New technique promises tunable laser devices

Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...

Im Focus: Ultrafast snapshots of relaxing electrons in solids

Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!

When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...

Im Focus: Quantum Sensors Decipher Magnetic Ordering in a New Semiconducting Material

For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.

Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

“Lasers in Composites Symposium” in Aachen – from Science to Application

19.09.2017 | Event News

I-ESA 2018 – Call for Papers

12.09.2017 | Event News

EMBO at Basel Life, a new conference on current and emerging life science research

06.09.2017 | Event News

 
Latest News

Rainbow colors reveal cell history: Uncovering β-cell heterogeneity

22.09.2017 | Life Sciences

Penn first in world to treat patient with new radiation technology

22.09.2017 | Medical Engineering

Calculating quietness

22.09.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>