Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Lighting the way to better nanoscale films

31.08.2004


Most miniature electronic, optical and micromechanical devices are made from expensive semiconductor or ceramic materials. For some applications like diagnostic lab-on-a-chip devices, thin-film polymers may provide a cheaper alternative, but the structure and properties of these materials—-often no more than a few nanometers (nm) thick—-are difficult to determine. In addition, defects in the thin polymer masking materials used to "print" integrated circuits can produce malfunctioning components. Consequently, researchers would like to have a non-invasive method for scanning polymer films for defects at high resolution.


Left: The crystal structure of a thin-film polymer "seaweed" crystal that is about four micrometers wide. Brighter areas indicate parts of the crystal with the greatest "strain." Center: The same crystal with lines superimposed showing the direction of strain between the crystal’s atoms. Right: Closeup of the upper left portion of the center image.



In the Aug. 23 issue of Applied Physics Letters,* researchers at the National Institute of Standards and Technology (NIST) report on an application of a new method for studying ultrathin polymers that makes it possible to visualize defects and structure in these materials and should help improve basic understanding of crystal formation in polymers.

Using a special form of near-field scanning optical microscopy, the NIST researchers were able to determine the structure of, and "strain" (stretching between atoms) in, thin-film crystals of polystyrene. Polystyrene is a ubiquitous plastic found in foam cups, CD cases and many other products.


The films examined formed tiny crystals just 15 nm thick and about 1500 nanometers wide, which makes them difficult to study with other optical microscopes. In the NIST experiments, blue-green light was piped through a glass fiber about 50 nm wide and scanned across the sample about 10 nm above the surface. Changes in the polarization of the light (the direction of the wave’s electric field) as it transmits through the sample then were used to investigate the material’s crystal structure and to map areas of strain.

The NIST results should help scientists choose and improve polymer materials and processes for fabricating a range of microscale and nanoscale plastic devices.

Gail Porter | EurekAlert!
Further information:
http://www.nist.gov

More articles from Physics and Astronomy:

nachricht Individualized fiber components for the world market
23.06.2017 | Laser Zentrum Hannover e.V.

nachricht Innovative LED High Power Light Source for UV
22.06.2017 | Omicron - Laserage Laserprodukte GmbH

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

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

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

Im Focus: Optoelectronic Inline Measurement – Accurate to the Nanometer

Germany counts high-precision manufacturing processes among its advantages as a location. It’s not just the aerospace and automotive industries that require almost waste-free, high-precision manufacturing to provide an efficient way of testing the shape and orientation tolerances of products. Since current inline measurement technology not yet provides the required accuracy, the Fraunhofer Institute for Laser Technology ILT is collaborating with four renowned industry partners in the INSPIRE project to develop inline sensors with a new accuracy class. Funded by the German Federal Ministry of Education and Research (BMBF), the project is scheduled to run until the end of 2019.

New Manufacturing Technologies for New Products

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

A new technique isolates neuronal activity during memory consolidation

22.06.2017 | Life Sciences

Plant inspiration could lead to flexible electronics

22.06.2017 | Materials Sciences

A rhodium-based catalyst for making organosilicon using less precious metal

22.06.2017 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>