Researchers at Nanoscience Center of University of Jyväskylä in Finland have succeeded in producing short chains and rings of gold nanoparticles with unprecedented precision. They used a special kind of nanoparticles with a well-defined structure and linked them together with molecular bridges. These structures – being practically huge molecules – allow extremely accurate studies of light–matter interaction in metallic nanostructures and plasmonics. This research was funded by The Academy of Finland.
Nanotechnology gives us tools to fabricate nanometer sized particles where only a few hundred metal atoms form their core. New interesting properties emerge in this scale, for example, the light–matter interaction is extremely strong and catalytic activity increased. These properties have led to several applications, such as, chemical sensors and catalysts.
“Synthesis of nanoparticles usually yields a variety of sizes and shapes”, say lecturer Dr Tanja Lahtinen. The approach we use is exceptional in the sense that after purification we get only a single type of a nanoparticle. These nanoparticles have a specified number of each atom and the atoms are organized as a well-defined structure. It is essentially a single huge molecule with a core of gold. These nanoparticles were linked with molecular bridges forming pairs, chains, and rings of nanoparticles.
“When these kind of nanostructures interact with light, electron clouds of the neighboring metal cores become coupled”, explains researcher Dr Eero Hulkko. The coupling alters significantly the electric field what molecules in between the particles feel.
“Studying nanostructures that are well-defined at the atomic level allows us to combine experimental and computational methods in a seemless way”, continues Dr Lauri Lehtovaara, Research Fellow of the Finnish Academy. We are aiming to understand light–matter interaction in linked metallic nanostructures at the quantum level. Deeper understanding is essential for development of novel plasmonic applications.
The research continues a long-term multidispilinary collaboration at Nanoscience Center of University of Jyväskylä.
“I am very happy that our dedicated efforts on studying monolayer protected clusters and their applications have created an unique multidisiplinary center of excellence which is able to continuously publish high impact science”, says Hannu Häkkinen, an Academy Professor and head of the Nanoscience Center.
In addition to the above persons, Karolina Sokołowska, Dr Tiia-Riikka Tero, Ville Saarnio, Dr Johan Lindgren, and Prof Mika Pettersson contributed to the research. The research was published in the Nanoscale on xx.9.2016. Computational resources were supplied by CSC - IT Center for Science.
For further information, please contact:
Aila Pirinen | AlphaGalileo
Fingerprint' technique spots frog populations at risk from pollution
27.03.2017 | Lancaster University
Parallel computation provides deeper insight into brain function
27.03.2017 | Okinawa Institute of Science and Technology (OIST) Graduate University
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...
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...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
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...
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...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
27.03.2017 | Earth Sciences
27.03.2017 | Life Sciences
27.03.2017 | Life Sciences