Research scientists at INM - Leibniz Institute for New Materials have combined the benefits of organic and inorganic electronic materials in a new type of hybrid inks. This allows electronic circuits to be applied to paper directly from a pen, for example.
The electronics of the future will be printed. Flexible circuits can be produced inexpensively on foil or paper using printing processes and permit futuristic designs with curved diodes or input elements. This requires printable electronic materials that can be printed and retain a high level of conductivity during usage in spite of their curved surfaces.
Some tried and tested materials include organic, conductive polymers and nanoparticles made of conductive oxides (TCOs). Research scientists at INM – Leibniz-Institute for New Materials have now combined the benefits of organic and inorganic electronic materials in a new type of hybrid inks. This allows electronic circuits to be applied to paper directly from a pen, for example.
The developers will be demonstrating their results and the possibilities they offer at stand B46 in hall 2 at this year's Hanover Trade Fair as part of the leading trade show Research & Technology which takes place from 25th to 29th April.
To create their hybrid inks, the research scientists coated nanoparticles made of metals with organic, conductive polymers and suspended them in mixtures of water and alcohol. These suspensions can be applied directly on paper or foil using a pen and they dry without any further processing to form electrical circuits.
“Electrically conductive polymers are used in OLEDs, for example, which can also be manufactured on flexible substrates,” explains Tobias Kraus, Head of the research group Structure Formation at INM. “The combination of metal and nano-particles that we introduce here combines mechanical flexibility with the robustness of a metal and increases the electrical conductivity”.
The developers combine the organic polymers with gold or silver nanoparticles. The organic compounds have three functions: “On the one hand, the compounds serve as ligands, ensuring that the nanoparticles remain suspended in the liquid mixture; any agglomeration of particles would have a negative effect on the printing process. Simultaneously, the organic ligands ensure that the nanoparticles have a good arrangement when drying.
Ultimately, the organic compounds act as ´hinges´: if the material is bent, they maintain the electrical conductivity. In a layer of metal particles without the polymer sheath the electrical conductivity would quickly be lost when the material is bent,” the material scientist Kraus continues. Due to the combination of both materials, when bent, the electrical conductivity is greater all in all than in a layer that is made purely of conductive polymer or a layer made purely of metal nanoparticles.
“Metal nanoparticles with ligands are already printed to form electronics today,” explains the physical chemist Kraus, adding that the shells mostly had to be removed by a sintering process because, while on the one hand they control the arrangement of the nanoparticles, on the other hand, they are not conductive.
He added that this was difficult in the case of carrier materials that are sensitive to temperature such as paper or polymer films since these would be damaged during the sintering process. Kraus summarizes the results of his research, saying, “Our new hybrid inks are conductive as soon as they have dried as well as being particularly mechanically flexible and they do not require sintering”.
B. Reiser, L. González-García, I. Kanelidis, J. H. M. Maurera, T. Kraus; Gold nanorods with conjugated polymer ligands: sintering-free conductive inks for printed electronics; Chem. Sci., 2016; DOI: 10.1039/C6SC00142D
Your expert at INM:
Dr. Tobias Kraus
INM – Leibniz-Institut für Neue Materialien
Stellv. Leiter InnovationsZentrum INM
Tel: +49 681-9300-389
INM conducts research and development to create new materials – for today, tomorrow and beyond. Chemists, physicists, biologists, materials scientists and engineers team up to focus on these essential questions: Which material properties are new, how can they be investigated and how can they be tailored for industrial applications in the future? Four research thrusts determine the current developments at INM: New materials for energy application, new concepts for medical surfaces, new surface materials for tribological systems and nano safety and nano bio. Research at INM is performed in three fields: Nanocomposite Technology, Interface Materials, and Bio Interfaces.
INM – Leibniz Institute for New Materials, situated in Saarbrücken, is an internationally leading centre for materials research. It is an institute of the Leibniz Association and has about 220 employees.
Dr. Carola Jung | idw - Informationsdienst Wissenschaft
High Resolution Laser Structuring of Thin Films at LOPEC 2017
21.03.2017 | Fraunhofer-Institut für Lasertechnik ILT
Open ecosystem for smart assistance systems
20.03.2017 | Fraunhofer-Institut für Arbeitswirtschaft und Organisation IAO
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
24.03.2017 | Materials Sciences
24.03.2017 | Physics and Astronomy
24.03.2017 | Physics and Astronomy