Scientists at the Max Planck Institute for Polymer Research (MPI-P) led by Dr. Kamal Asadi have solved a four decade long challenge of producing very thin nylon films that can be used for instance in electronic memory components. The thin nylon films are several 100 times thinner than human hair and could thus be attractive for applications in bendable electronic devices or for electronics in clothing.
As the microelectronic industry is now shifting toward wearable electronic gadgets and electronic (e-)textiles, the comprising electronic materials, such as ferroelectrics, should be integrated with our clothes. Nylons, a family of synthetic polymers, were first introduced in the 1920s’ for women’s stockings and are nowadays among the most widely used synthetic fibers in textiles.
They consist of a long chain of repeated molecular units, i.e. polymers, where each repeat unit contains a specific arrangement of hydrogen, oxygen, and nitrogen with carbon atoms.
Besides the use in textiles, it was discovered that some nylons also exhibit so called “ferroelectric properties”. This means that positive and negative electric charges can be separated and this state can be maintained.
The ferroelectric materials are used in sensors, actuators, memories and energy harvesting devices. The advantage in using polymers is that they can be liquified using adequate solvents and therefore processed from solution at low cost to form flexible thin-films which are suitable for electronic devices such as capacitors, transistors and diodes.
This makes ferroelectric polymers a viable choice for integration with e-textiles. Although nylon polymers have found over the years significant commercial applications in fabrics and fibers, their application in electronic devices was hindered because it was impossible to create high quality thin films of ferroelectric nylons by solution processing.
Scientists at the MPI-P, in collaboration with researchers from the Johannes Gutenberg University of Mainz and Lodz University of Technology, have now solved this forty year old problem, and developed a method to fabricate ferroelectric nylon thin-film capacitors by dissolving nylon in a mixture of trifluoroacetic acid and acetone and solidifying it again in vacuum.
They were able to realize thin nylon films that are typically only a few 100 nanometers thick, several 100 times thinner than human hair. “Using this method, we have produced extremely smooth thin-films. This is very important because it prevents electrical break down of for example capacitors and destroying the electronic circuits. At the same time, the smoothness allows for having transparent thin-films and eventually transparent electronic devices," says Dr. Kamal Asadi, group leader at the MPI-P.
By using their newly developed method, the group around Kamal Asadi was able to produce high performance nylon capacitors. The scientists subjected the prototypes of the capacitors to extended stress cycles and demonstrated robustness of ferroelectric nylons under millions of operation cycles.
The thin nylon films could become an important component for use in flexible electronics in the future and find applications in bendable electronic devices or for electronics in clothing. These new findings pave the way towards multi-functional fabrics that serve as cloth for covering our body and at the same time can generate electricity from our body movement.
Their results have now been published in the renowned journal "Science Advances".
Dr. Kamal Asadi
Phone.: 06131 – 379 126
Saleem Anwar, Daniel Pinkal, Wojciech Zajaczkowski, Philipp von Tiedemann, Hamed Sharifi Dehsari, Manasvi Kumar, Thomas Lenz, Ulrike Kemmer-Jonas, Wojciech Pisula, Manfred Wagner, Robert Graf, Holger Frey, Kamal Asadi
"Solution-processed transparent ferroelectric nylon thin films“, in: Science Advances (DOI: 10.1126/sciadv.aav3489)
http://www.mpip-mainz.mpg.de/asadi - Website of the Humboldt Research Group of Dr. Kamal Asadi
Dr. Christian Schneider | Max-Planck-Institut für Polymerforschung
Weitere Berichte zu: > Max-Planck-Institut > Nylon > Polymerforschung > body movement > building block > electronic circuits > electronic devices > electronic materials > ferroelectric polymers > flexible electronics > human hair > synthetic polymers
Hitzeschilde für sparsame Flugzeuge
18.09.2019 | Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS
Turbine aus dem 3D-Drucker
18.09.2019 | Fraunhofer-Gesellschaft
How long the battery of your phone or computer lasts depends on how many lithium ions can be stored in the battery's negative electrode material. If the battery runs out of these ions, it can't generate an electrical current to run a device and ultimately fails.
Materials with a higher lithium ion storage capacity are either too heavy or the wrong shape to replace graphite, the electrode material currently used in...
Heidelberger Wissenschaftler und Ärzte beschreiben aktuell im Fachjournal „Nature“, wie Nervenzellen des Gehirns mit aggressiven Glioblastomen in Verbindung treten und so das Tumorwachstum fördern / Mechanismus der Tumor-Aktivierung liefert Ansatzpunkte für klinische Studien
Nervenzellen geben ihre Signale über Synapsen – feine Zellausläufer mit Kontaktknöpfchen, die der nächsten Nervenzelle aufliegen – untereinander weiter....
To process information, photons must interact. However, these tiny packets of light want nothing to do with each other, each passing by without altering the...
Ein Forschungsteam vom Max-Planck-Institut für Struktur und Dynamik der Materie (MPSD), der Universität Hamburg und dem European Molecular Biology Laboratory (EMBL) hat eine neue Methode entwickelt, um Biomoleküle bei der Arbeit zu beobachten. Sie macht es bedeutend einfacher, enzymatische Reaktionen auszulösen, da hierzu ein Cocktail aus kleinen Flüssigkeitsmengen und Proteinkristallen angewandt wird. Ab dem Zeitpunkt des Mischens werden die Proteinstrukturen in definierten Abständen bestimmt. Mit der dadurch entstehenden Zeitraffersequenz können nun die Bewegungen der biologischen Moleküle abgebildet werden.
Die Funktionen von Biomolekülen werden nicht nur durch ihre molekularen Strukturen, sondern auch durch deren Veränderungen bestimmt. Mittels der...
Researchers from the Department of Atomically Resolved Dynamics of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg, the University of Hamburg and the European Molecular Biology Laboratory (EMBL) outstation in the city have developed a new method to watch biomolecules at work. This method dramatically simplifies starting enzymatic reactions by mixing a cocktail of small amounts of liquids with protein crystals. Determination of the protein structures at different times after mixing can be assembled into a time-lapse sequence that shows the molecular foundations of biology.
The functions of biomolecules are determined by their motions and structural changes. Yet it is a formidable challenge to understand these dynamic motions.
20.09.2019 | Veranstaltungen
20.09.2019 | Veranstaltungen
19.09.2019 | Veranstaltungen
20.09.2019 | Energie und Elektrotechnik
20.09.2019 | Biowissenschaften Chemie
20.09.2019 | Medizintechnik