A diary of some remarkable events at the IAP and beyond…
* With her first-author paper published today in Nature Communications, Elisabeth Gruber, PhD student in the Atomic and Plasma Physics Group of Fritz Aumayr, made the TU headlines already for the second time in this year (see the news from 2016-Aug-29 below). In her work, she demonstrated that graphene, a two-dimensional form of carbon, is able to provide tens of electrons for charge neutralization of a slow highly charged ion within a few femtoseconds only. This in turn results in extremely high current densities, which the graphene can withstand without suffering permanent damage.
* Gareth Parkinson successfully defends his habilitation and our institute gains a newly-minted 'Dozent'. Congratulations!
* Since 2005, the achievements and expertise of successful women working in research and technology are highlighted on a monthly basis in the media by the FEMtech initiative (BMVIT ministry). This month Dipl.-Ing. Dr.techn. Katharina Dobes, former member of the Atomic and Plasma Physics Group of Fritz Aumayr and now working at RUAG Space GmbH, has been selected as FEMtech Female Expert of the Month September 2016. After Ille Gebeshuber (FEMtech Female Expert in March 2008) she is the second IAP co-worker having received this prestigious acknowledgement. Press coverage der Standard (24.09.2016), FFG, FEMtech,YouTube Video.
* A meteorite impacting the earth under a grazing angle of incidence can do a lot of damage; it may travel a long way, carving a trench into the ground until it finally penetrates the surface. The impact site may be vaporized, there can be large areas of molten ground. All that remains is a crater, some debris, and an extensive trail of devastation on both sides of the impact site.
Hitting a surface with high-energy, heavy ions has quite similar effects – only on a much smaller scale. In a recent publication researchers from the IAP Atomic and Plasma Physics Group have investigated the microscopic structures which are formed when ions are fired at crystals at oblique angles of incidence and could shed light on the underlying formation mechanism.
- We welcome Mr. Heinrich Zlabinger, who started working in our electronics workshop today.
- Sintering - the aggregation of catalytically active, metallic nanoparticles into bigger clumps - is one of the major causes of catalyst de-activation. This is particularly important in the emerging field of single-atom catalysis, the main research topic of the START project of Gareth Parkinson. A detailed STM and DFT study, mainly conducted by Roland Bliem, and published in PNAS, shows how single Pt atoms on the Fe3O4(001) surface are made mobile by CO, and how they merge into bigger clusters. Interestingly, the smallest cluster, a Pt dimer, is stabilized by the CO molecules. When the sample is heated, and the CO desorbs, and the two Pt atoms separate again.
- The article "Switching stiction and adhesion of a liquid on a solid" by Stijn Mertens et al. is featured on this week's cover of Nature Magazine. The work describes dynamic contact angle measurements of a single drop of 0.1 M HClO4 on a single layer of BN supported on Rh(111). Friction can be changed reversibly by applying an appropriate electrochemical potential that leads to the intercalation of H between BN and the Rh.
- Roland Bliem, a PhD student in our Institute, has received the Christian-Doppler-Preis 2015 in the category Physics for his work on metal adsorption on the magnetite (001) surface. The Christian-Doppler-Preis is the science award of Roland's home province Salzburg, awarded biennially to researchers under 40 years of age. It is named after the famous physicist Christian Doppler who was born in Salzburg in 1803.
- After more than 7 years of leave from TU Wien Prof. Ille C. Gebeshuber returns from Kuala Lumpur, where she worked at the National University of Malaysia (Universiti Kebangsaan Malaysia). Welcome back Ille!
- Honoring his commitment and exemplary leadership in establishing the super computers “Vienna Scientific Cluster” (VSC1, VSC2, and VSC3), our rector awards Prof. Herbert Störi an honorary citizenship of TU Wien (Ehrenbürgerschaft der TU Wien). Congratulations Herbert!
TU Webnews (in German)
- Dr. Zbynek Novotny is one of two recipients of this year's Loschmidt Prize. This prize is awarded annually by the Austrian Chemical Physics Society for an outstanding PhD thesis. Zbynek received his doctorate in 2013 under the guidance of Prof. Ulrike Diebold; his thesis is entitled “The Fe3O4 Surface as an Adsorption Template”. He is currently a post-doc the Pacific Northwest National Lab in Washington State, U.S. Congratulations!
TU Webnews (in German)
- After 9 years of service Prof. Herbert Störi ended his term as head (“Institutsvorstand”) of IAP as planned and handed over his office to Fritz Aumayr. From November 9th, 2006 until December 31st, 2015 he guided the institute through most difficult times and managed to expand the lab and office space of our institute considerably. During this period, two new Professors were hired and the measurable “output” of the institute increased tremendously both in quality and quantity. Herbert Störi will still continue his research work and teaching as a Professor.
Herbert, we all are very grateful for your work! Thank you very much!
- Our research on strontium ruthenate surfaces shows how water dissociates and strips off one hydrogen atom upon adsorption. Although the hydrogen atom and the remaining OH group are physically separated, the pieces continue to interact through a weak hydrogen bond. This interaction leads to an interesting dynamic behavior, where the OH group circles the stripped off hydrogen atom. The result were published in Nature Materials. Click twice on the animation and watch the water dance.
- Effective of Dec 1st, 2015 Fritz Aumayr was appointed as a full professor of ion and plasma physics. He joined our institute in 1982. In addition to his highly successful research work Fritz Aumayr is since several years the head of research unit of the Austrian research program on nuclear fusion. To our students he is well known for his excellent introductory physics lectures.
- In a short video the research activities of our faculty are introduced to a broader public.
"Follow me around video" (in German)
- The European Academy of Sciences established the Blaise Pascal Medal in 2003 to recognize an outstanding and demonstrated personal contribution to science and technology and the promotion of excellence in research and education. Up to six medals may be awarded in any one year. This year Ulrike Diebold was honored with the Blaise Pascal Metal in Materials Science.
- Researchers of the IAP surface physics group nicely show how a prototype catalytic reaction works. They have studied a supported catalyst, platinum on magnetite (Fe3O4), and demonstrate the important role of the oxide support. CO oxidation eats the oxygen from the magnetite support, and platinum helps to oxidize the support again. They could also investigate in detail what happens if hydrogen is oxidized with the help of the catalyst. These results were published in Angewandte Chemie International Edition and provide the groundwork for improving catalysts.
- Margareta Wagner of the Surface Physics Group received a Hertha Firnberg Award for her research programme “Organic Molecules on Transparent Conductive Oxides: Fundamental studies”. The Hertha Firnberg programme of the Austrian Science Fund (FWF) aims at boosting the career of extremely well qualified female scientists.
- Gareth Parkinson of the surface Physics Group has received the START Prize, the highest Austrian award for outstanding young researchers. Congratulations! The prize money will enable him to pursue research on single-atom catalysis during the next six years. With now three START awardees and one Wittgenstein laureate, Gareth also makes our institute one of the most successful institutions in this respect!
- Since almost two decades, it was widely believed that tiny structures made of lipid molecules and proteins wander within the membrane of a cell. These so-called molecular rafts would be important for cellular processes. Now a team of researchers around Eva Sevcsik and Gerhard Schütz of the IAP biophysics group could show that it's all different! The results have been published in Nature Communications.
- Founded in 1652, the Leopoldina is one of the oldest academies of science in the world. In the March 2015 elections the class of Mathematics, Natural Sciences and Engineering elected 11 new members, one of them is Ulrike Diebold.
- Mitochondria are essential for our cells, they produce the energy carrier ATP. Unfortunately, mitochondria are too small for scrutiny by conventional light microscopy. Using superresolution microscopy techniques, the IAP biophysics group has determined where the relevant proteins are located in mitochondria, which provides important insights into how mitochondria work. These results are published in the prestigious journal Proceedings of the National Academy of Sciences of the United States of America (PNAS).
- A team around Gareth Parkinson of the Surface Physics group has solved a long-standing mystery: No one could explain why the magnetite Fe3O4(001) surface behaves differently than all other oxides. It turned out that this surface has a very peculiar crystal structure, which requires a new way of thinking about oxide surfaces in general. The results have been published in the prestigious journal Science.
- Wolfgang Husinsky and his co-workers have demonstrated for the first time that an array of nanoantennas (central nanotips inside sub-micrometer pits) on an aluminum surface, fabricated using a specific double-pulse femtosecond laser irradiation scheme, results in a 28-fold enhancement of the non-linear (three-photon) electron photoemission yield. The results are reported in the latest issue of Laser Physics Letters.
- The Austrian Academy of Sciences ÖAW has different levels of membership. Ulrike Diebold has been a 'corresponding member' since 2012, and was elected a 'full member' in April 2014.
- A bullet fired through a block of wood will slow down. In a similar way, ions are decelerated when they pass through a solid material: the thicker the material, the larger the energy loss will be. However, this picture breaks down in ultra-thin target materials, which only consist of a few layers of atoms. This was recently demonstrated by Fritz Aumayr and his group in collaboration with the Helmholtzzentrum Dresden-Rossendorf. The results are reported in the latest issue of Physical Review Letters
- The SrTiO3(110) surface forms a reconstruction that consists of a monolayer TiO2, but in a special, rather unreactive - tetrahedrally coordinated - form. When oxygen vacancies are created in this layer, they move to the SrTiO3 interface, where the resulting excess electrons form a two-dimensional gas (2DEG). Zhiming Wang, Stefan Gerhold and Bernhard Stöger from the surface physics group have measured the electronic structure of this electron gas at the synchrotron Bessy in Berlin. (There they also took the happy photo at the right.) Different from other, known 2DEG's, this system shows a pronounced anisotropy that is depends on the doping level. The experimental results are complemented by theoretical calculations by Zhicheng Zhong and Karsten Held at the Institute of Solid State Physics, and Xianfeng Hao and Cesare Franchini, Computational Materials Physics, University of Vienna.
The results were published in the Proceedings of the National Academy of Sciences.
- This year's Lise Meitner Lecture is given by Prof. Jocelyn Bell Burnell (Oxford University) on Tuesday, November 12, 2013, 17h at the Prechtl Saal of the TU. Prof. Bell Burnell will be talking about her breakthrough discovery - pulsars. The Lise Meitner Lectures are public talks held by famous female physicist in memory of the great Lise Meitner. The event is sponsored by the Austrian Physical Society and organized by our institute.
- Anatase, a form of titanium dioxide (TiO2) is used in (photo)catalysis and many other applications. The interaction of oxygen molecules with this material is of central importance. How this happens on the atomic scale was investigated in experiments by Martin Setvin of the Surface Physics group and calculations by Annabella Selloni (Princeton University) and coworkers. It was found that O2 interacts with oxygen vacancies in the material, resulting in O2 (peroxo) molecules incorporated in the surface.
These results were published in the prestigious journal Science.
- The Surface Physics group was honored by a visit of the Austrian Federal Minister for Science and Research, Prof. Dr. Karlheinz Töchterle. He visited the labs and discussed ongoing and planned research with group members.
- Metals such as gold or palladium are often used as catalysts to speed up certain chemical reactions. When the atoms ball together, most of them do not get into contact with the surrounding gas any more and the catalytic effect diminishes drastically. The mechanism of clustering is not well understood, however. In an article published in the prestigious journal Nature Materials, Gareth Parkinson and co-workers report on a detailed study of this issue; they have followed the fate of each surface atom and analyze how they are affected by different gas atmospheres. They find carbon monoxide to bind strongly to palladium atoms, helping them to move across the surface.
- Ulrike Diebold was awarded the 2013 Arthur W. Adamson Award for Distinguished Service in the Advancement of Surface Chemistry from the American Chemical Society (ACS) for “significantly advancing the fundamental understanding of the surface chemistry of metal oxides, in particular TiO2, through excellent research, writing, and lecturing.” She received the award during the 245th National ACS Meeting in New Orleans, USA, April 7-11, 2013. At the meeting, a five-session symposium was held in her honor, with contributions from more than 40 scientists from the US, Europe, and Asia.
- As of 1 January 2013 the Austrian Academy of Sciences (ÖAW) has appointed Professor Friedrich Aumayr as “Head of Research Unit” of Association EURATOM-ÖAW. In this function he will coordinate the nuclear fusion research activities in Austria.
Media coverage: press release of TU Wien (in German), APA Austria Presse Agentur, derStandard.at (online), EFDA newsletter
- We extend a warm welcome to Dr. Stijn Mertens, who joins us from the KU Leuven. He will spearhead our new efforts in electrochemical STM.
- In collaboration with the Helmholtzzentrum Dresden-Rossendorf Fritz Aumayr and his group could clarify, why under certain circumstances the impact of a slow highly charged ion produces a crater on the surface while in other experiments a nano-hillock is observed. Their results are reported in the latest issue of Physical Review Letters Phys. Rev. Lett. 109 (2012) 117602.
Media coverage: Press release of the TU Wien (in German), Press release of Helmholtz-Zentrum Dresden-Rossendorf, Der Standard, APA, pro-physik.de
- From 1 to 6 July 2012, more than 25 Nobel Laureates and more than 580 young researchers from all over the world met at Lindau, Germany, to exchange ideas, discuss projects and build international networks. IAP graduate student Zbynek Novotny was selected to attend this meeting, which was dedicated to physics.
- The Austrian Academey of Sciences elected Ulrike Diebold as a 'corresponding member' in the class of natural sciences,exact sciences, and medicine.
- In the latest issue of Physical Review Letters [Phys. Rev. Lett. 108, 216103 (2012)], Zbyněk Novotný and colleagues describe the discovery of highly stable single gold atoms on a magnetite (Fe3O4) surface. This observation is expected to facilitate catalysis research: On the other substrates studied so far, gold atoms don't stay alone but easily form large clusters, which are considered less active catalysts than single atoms.
- Ulrike Diebold has received a prestigious ERC Advanced Grant for her project OxideSurfaces, which will be funded with up to 2.5M Euro, and will run over 5 years. The project focuses on metal oxides. These materials have an extremely wide range of physical and chemical properties, and are used in catalysis, solar cells, batteries, gas sensors, and many other technical areas. Research topics are the interaction between bulk and surface defects, complex oxides, and she will also aim at scanning probe microscopy of oxides with atomic resolution in an aqueous solution.
- Ulrike Diebold received an invitation to join the editorial board of Physical Review Letters (PRL). She will act as an associate editor for the Material Physics Division from 2012 - 2014. PRL reports on the 'hottest and newest' in all of physics, from high-energy to solid state to astrophysics. It is the most highly-respected journal in physics, and serving on its board is a true honor.
- The Austrian Fund for (FWF) has approved a new doctoral program 'Building Solids for Function' 'SolidFun'. The program will be providing students with the opportunity to pursue interdisciplinary research. Groups from chemistry, physics, and electrical engineering departments at the TU are participating. The Surface Physics Group at IAP, headed by Ulrike Diebold, will also be part of this new doctoral program. The application process will start this Spring.
- With his retirement as professor at the TU Wien, Peter Varga took a new position at the Brno University of Technology, and at the Central European Institute of Technology, CZ . Although he had a farewell party at the TU, he will continue giving courses here. He also continues to be a member of the Surface Physics Group.
- In an unusual location, the Opera House of Wrocław, Poland, Professor Ulrike Diebold gave a plenary talk at Europe's largest conference on surface science, ECOSS-28. The topic of Ulrike's talk was the Surface Science of Metal Oxides; she discussed recent progress, challenges, and opportunities in this area. The ECOSS-28 conference was attended by more than 650 participants, including IAP members Michael Schmid, Zbyněk Novotný, Philipp Scheiber, Gareth Parkinson, Peter Jacobson, and Sameena Shah Zaman, who also gave presentations on their recent research.
- Professor Gerhard J. Schütz, formerly at the University of Linz, has been appointed professor of biophysics. He will establish a biophysics group at our institute. Due to technical and space limitations, for the time being, his labs will be in the building of the chemistry department.
- Today is the official start of the Sonderforschungsbereich (SFB) “Functional Oxide Surfaces and Interfaces”. Results of this four-million-Euro research program are expected to have an impact on applications in catalysis, gas sensing, fuel cells and microelectronics. The SFB unites researchers from the TU Wien and the Universities of Vienna, Innsbruck and Siegen (Germany). Three of the ten project leaders in the SFB are members of our institute! Ulrike Diebold will work on pervoskites, Josef Redinger leads the theory part and Michael Schmid will study ultrathin zirconia films. See the TU Wien press release (in German) and the abstract of the SFB for more details.