Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Hot off the Press - Universal ink for microcontact printing

01.06.2006
“Printing” on the micrometer scale is the technology of the future for the production of the electronic components used for such things as flat-screen monitors or (bio)sensors.

Metal surfaces a few tens of square centimeters in size can already be structured without much experimental difficulty through a combination of microcontact printing and an etching process. Researchers are currently working to develop a simple production technology that is also broadly applicable for large surfaces. A team at Philips Research in Eindhoven in the Netherlands has now developed a universally applicable “ink” for microcontact printing.

The first step in microcontact printing is the production of an elastomeric malleable stamp by means of a mold. The stamp is then loaded with a special “ink” and is pressed onto the metal surface to be printed. The ink sticks to the metal surface and reproduces the microstructure of the stamp in a monomolecular layer. This monolayer acts as a corrosion-resistant mask in the subsequent etching process: the coated areas are not affected, whereas the metal in the uncoated areas is etched away, transferring the microstructure to the metal. Precious and coinage metals are both used, as are materials with oxidic surfaces, such as silicon and aluminum. Each type of surface requires a different type of ink to stick to it: precious and coinage metals need ink molecules that can be bound by means of a metal–sulfur bond. Oxidic surfaces bind molecules with an acid functionality, such as carboxylic acids or phosphonic acids. Substrates that have different types of metals on their surface are thus not easy to structure. Also, identical structures cannot be transferred onto different substrates with the same stamp, because once loaded, the stamp cannot be “washed” off and loaded with a different ink easily—and production of a new stamp is the most expensive part of the process.

The researchers led by Dirk Burdinski have now developed a universally applicable ink. It consists of a mixture of both types of ink, sulfur-containing octadecanethiol and octadecanephosphonic acid. When polydimethylsiloxane stamps are loaded with this ink, both types of metals can be structured. The individual components of the ink are selectively transferred to their corresponding surface without interfering with each other. This universal ink is potentially also useful for the coating of microfluidic systems on diagnostic chips, as these often have inner wall structures made of different materials. Also electronic component blocks requiring good adherence of the protective coating to different components could thus first be homogenized at the surface, allowing for better sealing.

Author: Dirk Burdinski, Philips Research, Eindhoven (The Netherlands), mailto:dirk.burdinski@philips.com
Title: Universal Ink for Microcontact Printing
Angewandte Chemie International Edition, doi: 10.1002/anie.200600310

Dirk Burdinski | Angewandte Chemie
Further information:
http://www.wiley.com
http://www.angewandte.org.

More articles from Life Sciences:

nachricht Multi-institutional collaboration uncovers how molecular machines assemble
02.12.2016 | Salk Institute

nachricht Fertilized egg cells trigger and monitor loss of sperm’s epigenetic memory
02.12.2016 | IMBA - Institut für Molekulare Biotechnologie der Österreichischen Akademie der Wissenschaften GmbH

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

Im Focus: Molecules change shape when wet

Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water

In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...

Im Focus: Fraunhofer ISE Develops Highly Compact, High Frequency DC/DC Converter for Aviation

The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.

Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

UTSA study describes new minimally invasive device to treat cancer and other illnesses

02.12.2016 | Medical Engineering

Plasma-zapping process could yield trans fat-free soybean oil product

02.12.2016 | Agricultural and Forestry Science

What do Netflix, Google and planetary systems have in common?

02.12.2016 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>