Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Tailored probes for atomic force microscopes

11.08.2016

3-D laser lithography enhances microscope for studying nanostructures in biology and engineering/ publication in Applied Physics Letters

Atomic force microscopes make the nanostructure of surfaces visible. Their probes scan the investigation material with finest measurement needles. KIT has now succeeded in adapting these needles to the application.


Optimally adapted probes for atomic force microscopes can now be produced by 3-D nanoprinting at KIT.

Photos: KIT

For any measurement task, e.g. for various biological samples, a suitable measurement needle can be produced. For production, 3D laser lithography, i.e. a 3D printer of structures in the nanometer size, is applied. This success has made it to the title page of the Applied Physics Letters journal. DOI: 10.1063/1.4960386

Atomic force microscopes are used to analyze surfaces down to the atomic level. The standard probes that have been applied for this purpose so far, however, are not suited for every use. Some examination objects require a special shape or a very long probe to scan deep depressions of the material. KIT researchers have now succeeded in producing probes that are optimally adapted to special requirements.

"Biological surfaces, such as the petals of tulips or roses, frequently have very deep structures with high hills," says Hendrik Hölscher, Head of the Scanning Probe Technologies Group of KIT's Institute of Microstructure Technology. Commercially available probes typically are 15 micrometers, i.e. 15 thousandths of a millimeter, high, pyramid-shaped, and relatively wide, the physicist points out. Probes with other shapes are offered, but have to be produced manually, which makes them very expensive.

The KIT researchers have now succeeded in producing by means of 3D laser lithography tailored probes of any shape with a radius of 25 nanometers only, corresponding to 25 millionths of a millimeter. This process can be used to design and print in three dimensions any shape desired and has been known in the macroscopic area for some time already. On the nanoscale, this approach is highly complex. To obtain the three-dimensional structures desired, the researchers use the 3D lithography process developed by KIT and commercialized by Nanoscribe, a spinoff of KIT. This method is based on two-photon polymerization: Strongly focused laser pulses are applied to harden light-sensitive materials after the desired structures have been produced. The hardened structures are then separated from the surrounding, non-exposed material. "In this way, the perfect probe can be produced for any sample to be studied," Hölscher explains.

Use of this process for enhancing atomic force microscopy is reported by the researchers in the Applied Physics Letters journal under the heading "Tailored probes for atomic force microscopy fabricated by two-photon polymerization". The probes that can be produced in any shape can be placed on conventional, commercially available measurement needles and are hardly subject to wear. They are perfectly suited for studying biological samples, but also technical and optical components in the range od nanometers.

###

Research was financed by the German Research Foundation, a Starting Grant and a Senior Grant of the European Research Council (ERC), funds of the Alfried Krupp von Bohlen and Halbach Foundation, and the Federal Ministry of Education and Research under the PHOIBOS project. In addition, work was supported by the "Karlsruhe Nano-Micro Facility" (KNMF) of KIT.

Gerald Göring, Philipp-Immanuel Dietrich, Matthias Blaicher, Swati Sharma, Jan G. Korvink, Thomas Schimmel, Christian Koos, and Hendrik Hölscher: Tailored probes for atomic force microscopy fabricated by two-photon polymerization. Applied Physics Letters. DOI 10.1063/1.4960386.

For further information, please contact: Kosta Schinarakis, PKM - Science Scout, Phone: +49 721 608 41956, Fax: +49 721 608 43658, E-mail: schinarakis@kit.edu

Karlsruhe Institute of Technology (KIT) pools its three core tasks of research, higher education, and innovation in a mission. With about 9,300 employees and 25,000 students, KIT is one of the big institutions of research and higher education in natural sciences and engineering in Europe.

KIT - The Research University in the Helmholtz Association

Since 2010, the KIT has been certified as a family-friendly university.

This press release is available on the internet at http://www.kit.edu.

Media Contact

Monika Landgraf
presse@kit.edu
49-721-608-47414

 @KITKarlsruhe

http://www.kit.edu/index.php 

Monika Landgraf | EurekAlert!

More articles from Physics and Astronomy:

nachricht Astronomers find unexpected, dust-obscured star formation in distant galaxy
24.03.2017 | University of Massachusetts at Amherst

nachricht Gravitational wave kicks monster black hole out of galactic core
24.03.2017 | NASA/Goddard Space Flight Center

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: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Argon is not the 'dope' for metallic hydrogen

24.03.2017 | Materials Sciences

Astronomers find unexpected, dust-obscured star formation in distant galaxy

24.03.2017 | Physics and Astronomy

Gravitational wave kicks monster black hole out of galactic core

24.03.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>