Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Hannover Messe: Silver circuits on foil allow curved touchscreens

12.04.2018

Mobile phones and smart phones still have not been adapted to the carrying habits of their users. That much is clear to anyone who has tried sitting down with a mobile phone in the back pocket: the displays of such devices are rigid and do not yield to the anatomical forms adopted by the people carrying them. To allow typing and swiping even on curved smartphones, touchscreens and electric conductor paths have also to be curved. Therefore INM has developed a technique which allows fabrication of such conductor lines on flexible foils and even on stretchable silicone.
INM will be presenting the so called photochemical metallization on this year’s Hannover Messe at stand B46 in hall 2.

For the proper functioning of touchscreens in smart phones or tablets, microscopically fine conductor lines are required on their surfaces. At the edges of the appliances, these microscopic circuit paths come together to form larger connective pads.


Silver circuits on foil with photochemical metallization.

Source: INM; free within this press release

Until now, these different lines had to be manufactured in several steps in time-consuming processes. With the photochemical metallization this is now possible in one single step on flexible substrates. The process offers several benefits: It is fast, flexible, variable in size, inexpensive and environmentally friendly. Furthermore additional process steps for post-treatment are not necessary.

In the new process, the foils are coated with a photoactive layer of metal oxide nanoparticles. “After that we apply a colorless, UV-stable silver compound,” Peter William de Oliveira, Head of Optical Materials explains. By irradiation of this sequence of layers, the silver compound disintegrates on the photoactive layer and the silver ions are reduced to form metallic, electrically conductive silver. In this way, lines of varying sizes down to the smallest size of a thousandth of a millimeter can be achieved.

This basic principle allows conductor lines to be created very individually. “There are different possibilities depending on the requirements: Writing conductor lines using UV lasers is the process which is particularly suitable for the initial customized prototype manufacture and for testing a new design of the conductor lines. However, for mass production, this method is too time-consuming,” the physicist de Oliveira explains.

The researchers are currently working intensely on a new method, the usage of transparent stamps. “These stamps push out the silver compound mechanically; conductor lines then only occur where the silver compound remains,” de Oliveira states. Since the stamps are made of a soft plastic, they can be arranged on a roll. Because the stamps are transparent, researchers at INM are now working on embedding the UV source directly in the roll.

“Thus, the initial steps for a roll-to-roll process will be taken,” the Head of Optical Materials group concludes. It will therefore be possible to manufacture conductor line structures of various sizes on foils on a large scale.

Your expert at INM
Dr. Peter William de Oliveira
INM – Leibniz Institute for New Materials
Head Optical Materials
Head InnovationCenter INM
Phone: +49681-9300-148
OptiMat@leibniz-inm.de

INM – Leibniz Institute for New Materials, situated in Saarbrücken, is an internationally leading centre for materials research. INM conducts research and development to create new materials – for today, tomorrow and beyond. Research at INM is performed in three fields: Nanocomposite Technology, Interface Materials, and Bio Interfaces. INM is an institute of the Leibniz Association and has about 240 employees.

Weitere Informationen:

http://www.leibniz-inm.de

Dr. Carola Jung | idw - Informationsdienst Wissenschaft

More articles from Trade Fair News:

nachricht Fraunhofer FIT at MEDICA and COMPAMED: Electrowetting and Telemedicine
23.10.2018 | Fraunhofer-Institut für Angewandte Informationstechnik FIT

nachricht App-App-Hooray! - Innovative Kits for AR Applications
19.10.2018 | Fraunhofer-Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik FEP

All articles from Trade Fair News >>>

The most recent press releases about innovation >>>

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

Im Focus: memory-steel - a new material for the strengthening of buildings

A new building material developed at Empa is about to be launched on the market: "memory-steel" can not only be used to reinforce new, but also existing concrete structures. When the material is heated (one-time), prestressing occurs automatically. The Empa spin-off re-fer AG is now presenting the material with shape memory in a series of lectures.

So far, the steel reinforcements in concrete structures are mostly prestressed hydraulically. This re-quires ducts for guiding the tension cables, anchors for...

Im Focus: Goodbye, silicon? On the way to new electronic materials with metal-organic networks

Scientists at the Max Planck Institute for Polymer Research (MPI-P) in Mainz (Germany) together with scientists from Dresden, Leipzig, Sofia (Bulgaria) and Madrid (Spain) have now developed and characterized a novel, metal-organic material which displays electrical properties mimicking those of highly crystalline silicon. The material which can easily be fabricated at room temperature could serve as a replacement for expensive conventional inorganic materials used in optoelectronics.

Silicon, a so called semiconductor, is currently widely employed for the development of components such as solar cells, LEDs or computer chips. High purity...

Im Focus: Storage & Transport of highly volatile Gases made safer & cheaper by the use of “Kinetic Trapping"

Augsburg chemists present a new technology for compressing, storing and transporting highly volatile gases in porous frameworks/New prospects for gas-powered vehicles

Storage of highly volatile gases has always been a major technological challenge, not least for use in the automotive sector, for, for example, methane or...

Im Focus: Disrupting crystalline order to restore superfluidity

When we put water in a freezer, water molecules crystallize and form ice. This change from one phase of matter to another is called a phase transition. While this transition, and countless others that occur in nature, typically takes place at the same fixed conditions, such as the freezing point, one can ask how it can be influenced in a controlled way.

We are all familiar with such control of the freezing transition, as it is an essential ingredient in the art of making a sorbet or a slushy. To make a cold...

Im Focus: Micro energy harvesters for the Internet of Things

Fraunhofer IWS Dresden scientists print electronic layers with polymer ink

Thin organic layers provide machines and equipment with new functions. They enable, for example, tiny energy recuperators. In future, these will be installed...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

European Space Talks: Weltraumschrott – eine Gefahr für die Gesellschaft?

23.10.2018 | Event News

Conference to pave the way for new therapies

17.10.2018 | Event News

Berlin5GWeek: Private industrial networks and temporary 5G connectivity islands

16.10.2018 | Event News

 
Latest News

Weighing planets and asteroids

23.10.2018 | Physics and Astronomy

Fiber-based quantum communication - Interference of photons using remote sources

23.10.2018 | Information Technology

'Mushrooms' and 'brushes' help cancer-fighting nanoparticles survive in the body

23.10.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>