Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

High-precision imaging revealed what holds on the smallest light responsive gold chain

06.02.2020

Manufacture of chemical sensors and catalysts based on gold nanoclusters gained new light from recent cutting-edge research

Manufacture of chemical sensors and catalysts based on gold nanoclusters gained new light from recent cutting-edge research. Chemists at the University of Jyväskylä, Finland and the University of California succeeded in determining the atomic precise structure of a chain of gold nanoclusters attached to each other. In this study the researchers revealed the disulfide-bridging bond between the bound nanoclusters. Linked gold nanocluster structures advance our understanding of the optical and electronic response of these systems which hold future perspectives in nanoelectronics and bioimaging. The study was published in The Journal of Physical Chemistry Letters publication in January 2020.


Suggested structure of two Au230 nanoclusters linked by 5,5?-bis(mercaptomethyl)-2,2?-bipyridine (BMM-BPy) dithiols.

Credit: The University of Jyväskylä/Karolina Sokolowska

These structures - practically huge molecules- were studied four years ago by a researchers at the Nanoscience Center of the University of Jyväskylä. At that time, researchers were the first in the world to build a chains of gold forged with atomic precision, which were named the world's smallest gold chains (Nanoscale, 2016).

In a just released spatially resolved imaging study of individual bonds, researchers investigated the structure of the chain with the precision of atoms and provided experimental confirmation that, the gold nanoparticles are linked together by bridging disulfide bonds. The proof of disulfide linking was to date the subject of speculatithe researchers revealed the disulfide-bridging bond between the bound nanoclusters. Linked gold nanocluster structures advance our understanding of the optical and electronic response of these systems which hold future perspectives in nanoelectronics and bioimaging. The ston.

"Modifying the surface of nanoclusters and the molecules connecting them is a step closer to new biological, medical and electronic applications," says Docent Tanja Lahtinen from the University of Jyväskylä.

A chain of nanoscale gold particles reacts with light.

"In these nanoscale superstructures, the electron clouds of the metal particles of adjacent particles are interconnected, opening up the possibility of studying the interactions between particles with very accurate theoretical calculations, now that we know, for sure, how the structures have formed," says researcher Eero Hulkko.

The atomic precise structure was revealed by combining imaging techniques

The exploration of nanoscale chemical structures has promoted by the rapid development of chemically selective imaging techniques. Atomic resolution of individual molecules requires extremely high resolution and sensitivity of the equipment.

This study utilized the latest transmission electron microscopy technology (TEM).

The measurements were made at the IMRI center, University of California using the JEM-ARM300F Grand ARM TEM equipment, where currently has the best commercially available electron microscopy equipment.

"This study combined high-resolution electron microscopy (TEM) with high-sensitivity electron energy loss spectroscopy (EELS), which allowed simultaneous structural and spectroscopic analysis to determine the nanoscale structure, with X-ray photoelectron spectroscopy (XPS) analysis supported by the above-mentioned data." review by researcher Karolina Sokolowska from the University of Jyväskylä.

###

This research was part of a research collaboration and researcher exchange with the Nanoscience Center (NSC) at the University of Jyväskylä and the Chemistry at the Space-Time Limit Center (CaSTL) at the University of California.

The study was conducted at the new IMRI (Irvine Materials Research Institute) Materials Research Center at the University of California, Irvine (UCI) campus.

Researchers included Karolina Sokolowska, Eero Hulkko and Docent Tanja Lahtinen from the University of Jyväskylä, Professor Ara Apkaria and Researcher Zhongyue Luan from the University of California, and Noelia Barrabés and Christoph Rameshan from the Technical University of Vienna.

Link to the research article: https://pubs.acs.org/doi/10.1021/acs.jpclett.9b03496

For further information:

Docent Tanja Lahtinen, tanja.m.lahtinen@jyu.fi, tel. +358 40 805 3697

Communications officer Tanja Heikkinen, tanja.s.heikkinen@jyu.fi, tel. +358 50 5818351

http://www.jyu.fi 

Tanja Lahtinen | EurekAlert!
Further information:
http://dx.doi.org/10.1021/acs.jpclett.9b03496

More articles from Life Sciences:

nachricht Cancer mutations occur decades before diagnosis
06.02.2020 | European Molecular Biology Laboratory

nachricht Chromothripsis in human cancer
06.02.2020 | European Molecular Biology Laboratory

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: New coronavirus module in SORMAS

HZI-developed app for disease control is expanded to stop the spread of the pathogen

At the end of December 2019, the first cases of pneumonia caused by a novel coronavirus were reported from the Chinese city of Wuhan. Since then, infections...

Im Focus: New insights could lead to superconductivity in ambient conditions

A team of researchers from Switzerland, the US and Poland have found evidence of a uniquely high density of hydrogen atoms in a metal hydride. The smaller spacings between the atoms might enable packing significantly more hydrogen into the material to a point where it could begin to superconduct at room temperature and ambient pressure.

The scientists conducted neutron scattering experiments at the Oak Ridge National Laboratory (ORNL) in the US on samples of zirconium vanadium hydride at...

Im Focus: Viscosity measurements offer new insights into the earth's mantle

An international research group with Dr. Longjian Xie from the Bavarian Research Institute of Experimental Geochemistry & Geophysics (BGI) of the University of Bayreuth has succeeded for the first time in measuring the viscosity that molten solids exhibit under the pressure and temperature conditions found in the lower earth mantle. The data obtained support the assumption that a bridgmanite-enriched rock layer was formed during the early history of the earth at a depth of around 1,000 kilometres – at the border to the upper mantle.

In addition, the data also provides indications that the lower mantle contains larger reservoirs of materials that originated in an early magma ocean and have...

Im Focus: Fast rotating white dwarf drags its space-time in a cosmic dance

According to Einstein's general relativity, the rotation of a massive object produces a dragging of space-time in its vicinity. This effect has been measured, in the case of the Earth’s rotation, with satellite experiments. With the help of a radio pulsar, an international team of scientists (with important contributions from scientists at the Max Planck Institute for Radio Astronomy in Bonn, Germany) were able to detect the swirling of the space-time around its fast-rotating white dwarf-companion star, and thus confirm the theory behind the formation of this unique binary star system.

In 1999, a unique binary system was discovered with the Australian Parkes Radio Telescope in the constellation Musca (the Fly), close to the famous Southern...

Im Focus: Quantum logic spectroscopy unlocks potential of highly charged ions

Scientists from the Physikalisch-Technische Bundesanstalt (PTB) and the Max Planck Institute for Nuclear Physics (MPIK) have carried out pioneering optical measurements of highly charged ions with unprecedented precision. To do this, they isolated a single Ar¹³⁺ ion from an extremely hot plasma and brought it practically to rest inside an ion trap together with a laser-cooled, singly charged ion. Employing quantum logic spectroscopy on the ion pair, they have increased the relative precision by a factor of a hundred million over previous methods. This opens up the multitude of highly charged ions for novel atomic clocks and further avenues in the search for new physics. [Nature, 29.01.2020]

Highly charged ions are—although seemingly exotic—a very natural form of visible matter. All the matter in our sun and in all other stars is highly ionized,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

11th Advanced Battery Power Conference, March 24-25, 2020 in Münster/Germany

16.01.2020 | Event News

Laser Colloquium Hydrogen LKH2: fast and reliable fuel cell manufacturing

15.01.2020 | Event News

„Advanced Battery Power“- Conference, Contributions are welcome!

07.01.2020 | Event News

 
Latest News

JEC World 2020: laser processes for future composites

06.02.2020 | Trade Fair News

Project CoPDA: DFKI Laboratory Niedersachsen teaches dynamic knowledge to robots for a better human-machine interaction

06.02.2020 | Information Technology

A bumble bee’s diet affects survival and reproductive capabilities

05.02.2020 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>