Featured Research

from universities, journals, and other organizations

Printing Plastic Circuits Stamps Patterns In Place

Date:
September 10, 2003
Source:
Penn State
Summary:
When Benjamin in "The Graduate" was told to go into plastics, computers were in their infancy and silicon technology ruled. Now, conducting organic polymers are infiltrating the electronics sphere and the watchword is once again plastics, according to Penn State researchers.

When Benjamin in "The Graduate" was told to go into plastics, computers were in their infancy and silicon technology ruled. Now, conducting organic polymers are infiltrating the electronics sphere and the watchword is once again plastics, according to Penn State researchers.

"For plastic circuits we cannot use the old processing," says Dr. Qing Wang, assistant professor of materials science and engineering. "Photolithography and silicon technologies require harsh environments and plastics cannot hold up to them."

Wang, working with Ziqi Liang and Kun Li, graduate students in materials science and engineering, are looking into novel processing methods for production of organic conducting polymer circuits. One method that is low cost, easy to do, fast and adaptable to large areas and non-flat surfaces, is micro contact printing.

"We use conducting polymers that are functionalized," Wang told attendees today (Sept. 9) at the annual meeting of the American Chemical Society in New York. "They have functional groups attached that allow them to be soluble and to attach to the surface." The researchers used poly (p-phenylene vinylene), PPV, which was modified by adding alkyoxy side chains and amino end groups. Altering the polymer allows it to dissolve in a variety of organic solvents. The amines act as reaction points where the polymer can attach to another chemical.

Attachment is important as most polymers are slippery and do not want to adhere to surfaces. In conventional ink printing, ink is held onto the paper by surface interactions, but not by chemical reactions. When printing a plastic electronic device, surface interactions are not strong enough to hold the polymer "ink" onto the surface.

Wang used a gold substrate onto which an organic acid, 16-mercaptohexadecanoic acid, was placed in a self-assembled monolayer. This single layer of molecules of MHA provides specific chemical groups to which the amino end groups of the polymer can attach.

In conventional printing, ink is placed on the plate and then the ink and paper are brought together for a very short time during which the wet ink is transferred to the paper. When printing polymers on organic acid coated gold, the process is different. The researchers used a pliable stamp of the submicron pattern they wish to transfer. They then applied the polymer "ink" to the stamp surface and dried it. The stamp and the substrate are held in contact for 30 minutes while the polymer transfers to the substrate.

Because the stamp is pliable, this printing method is applicable to curved surfaces. A wide variety of opto-electric devices are possible, including light-emitting diodes, field effect transistors, lasers, solar cells and chemical and biological sensors.

Wang has investigated the resulting patterns using a variety of macroscopic techniques to ensure that the pattern created on the surface is continuous and usable. Micro contact printing does create patterns with some defects, but the researchers believe that the resultant product is usable.

"Micro-printed patterns of conducting polymer need to be used in applications where some defects can be tolerated," says Wang.

"Although we do optimize the printed pattern as much as possible."

The Commonwealth of Pennsylvania's Lehigh/Penn State Center for Optical Technologies supported this work.


Story Source:

The above story is based on materials provided by Penn State. Note: Materials may be edited for content and length.


Cite This Page:

Penn State. "Printing Plastic Circuits Stamps Patterns In Place." ScienceDaily. ScienceDaily, 10 September 2003. <www.sciencedaily.com/releases/2003/09/030910072958.htm>.
Penn State. (2003, September 10). Printing Plastic Circuits Stamps Patterns In Place. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2003/09/030910072958.htm
Penn State. "Printing Plastic Circuits Stamps Patterns In Place." ScienceDaily. www.sciencedaily.com/releases/2003/09/030910072958.htm (accessed July 22, 2014).

Share This




More Matter & Energy News

Tuesday, July 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Government Approves East Coast Oil Exploration

Government Approves East Coast Oil Exploration

AP (July 18, 2014) The Obama administration approved the use of sonic cannons to discover deposits under the ocean floor by shooting sound waves 100 times louder than a jet engine through waters shared by endangered whales and turtles. (July 18) Video provided by AP
Powered by NewsLook.com
Sunken German U-Boat Clearly Visible For First Time

Sunken German U-Boat Clearly Visible For First Time

Newsy (July 18, 2014) The wreckage of the German submarine U-166 has become clearly visible for the first time since it was discovered in 2001. Video provided by Newsy
Powered by NewsLook.com
Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Reuters - US Online Video (July 17, 2014) President Barak Obama stopped by at a lunch counter in Delaware before making remarks about boosting the nation's infrastructure. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com
Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

TheStreet (July 16, 2014) Oil Futures are bouncing back after tumbling below $100 a barrel for the first time since May yesterday. Jeff Grossman is the president of BRG Brokerage and trades at the NYMEX. Grossman tells TheStreet the Middle East is always a concern for oil traders. Oil prices were pushed down in recent weeks on Libya increasing its production. Supply disruptions in Iraq fading also contributed to prices falling. News from China's economic front showing a growth for the second quarter also calmed fears on its slowdown. Jeff Grossman talks to TheStreet's Susannah Lee on this and more on the Energy Department's Energy Information Administration (EIA) report. Video provided by TheStreet
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins