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Elisa Monte, JLU
Artistic representation of the crystal structure of the innovative material. Individual layers of the crystal can simply be lifted off.
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They are 50,000 times thinner than a human hair, and just a few atoms thick: two-dimensional materials are the thinnest substances it is possible to make today. They have completely new properties and are regarded as the next major step in modern semiconductor technology. In the future they could be used instead of silicon in computer chips, light-emitting diodes and solar cells. Until now, the development of new two-dimensional materials has been limited to structures with layers of rigid chemical bonds in two spatial directions - like a sheet of paper in a stack. Now for the first time, a research team from the universities of Marburg, Giessen and Paderborn, led by Dr. Johanna Heine (Inorganic Chemistry, Philipps University of Marburg) has overcome this limitation by using an innovative concept. The researchers developed an organic-inorganic hybrid crystal which consists of chains in a single direction, yet still forms two-dimensional layers in spite of this. This makes it possible to combine different material components, like pieces in a construction set, to create tailored materials with innovative properties.
In this project, the research team combined the advantages of two-dimensional materials and hybrid perovskites - the eponymous mineral perovskite is well-known for its optoelectronic properties, and can be combined with other materials to improve these characteristics. "What is special about this is that it offers completely new options for targeted design of future functional materials," says Dr. Johanna Heine, a chemist and junior research group leader at the University of Marburg, describing this highly topical research area which has great application potential. "This physical effect - first discovered here - could make it possible to tune the colour of future lighting and display technologies in a simple and targeted way," says physicist Philip Klement, lead author and doctoral student in the research group led by Professor Sangam Chatterjee at the Justus Liebig University of Giessen (JLU).
The work was carried out in an interdisciplinary collaboration: Dr. Johanna Heine's team at the University of Marburg first developed the chemical synthesis and created the material as a single bulk crystal. Philip Klement and Professor Chatterjee's team at JLU then used these crystals to produce individual atomically thin layers and investigated them using optical laser spectroscopy. They found a spectrally broadband ("white") light emission, whose colour temperature can be tuned by changing the thickness of the layer. Working closely with Professor Stefan Schumacher and his team of theoretical physicists at Paderborn University the researchers made a microscopic study of the effect and were able to improve the properties of the material.
In this way the researchers were able to cover the entire process from synthesis of the material and understanding its properties, to modelling the properties.
Spider venom for therapeutics and bioinsecticides
The venom of a single spider can contain up to 3000 components. These components, mostly peptides, can be used to develop promising drug leads for the treatment of diseases. Spider venom can also be used as a biological pesticide. A team of scientists from the Fraunhofer Institute for Molec ... more
How to analyze active unknown unknowns?
More than ever, consumers are concerned about the food they consume. For example, for botanical extracts used in food products and food supplements, fraud is quite common. It is evident that specifications, quality control and regulation of botanicals need to be improved [1-3]. more
With over a million documented species, insects are the most successful group of organisms from the perspective of biodiversity. In the course of their evolution, they have developed a giant arsenal of active ingredients and enzymes, which they use to defend themselves against enemies and d ... more
Trend barometer: taking the underground to the airport
Yes – you can talk about an ‚underground system’ in terms of analysis. Many samples are forwarded in parallel – including unstyled raw extracts in any condition. The connection to the airport is assured and today molecules can fly in a myriad of different ways. more
Gertrud Morlock, born in 1966, studied Nutritional Science and graduated with a PhD in chemistry under supervision of Prof. Dr. Helmut Jork and Prof. Dr. Heinz Engelhardt at University of Saarland. Subsequently, she worked for global industry leaders for several years, but in 2004 returned ... more
Computers Made of Genetic Material?
Tinier than the AIDS virus – that is currently the circumference of the smallest transistors. The industry has shrunk the central elements of their computer chips to fourteen nanometers in the last sixty years. Conventional methods, however, are hitting physical boundaries. Researchers arou ... more
Anti-tumor agent from the intestine
It is believed to be involved in the development of chronic inflammatory intestinal diseases, to trigger diabetes, to be responsible for obesity, even neurological diseases such as multiple sclerosis and Parkinson's could have their causes here – not to mention depressions and autistic diso ... more
New SARS-CoV-2 neutralizing antibody enters clinical phase
Cologne University Hospital (UKK), University of Marburg (UMR), the German Center for Infection Research (DZIF) and Boehringer Ingelheim announced the initiation of Phase 1/2a clinical investigation of BI 767551, a new SARS-CoV-2 neutralizing antibody. By combining UKK, UMR and DZIF’s exper ... more
From RNA World to Protein World
Within the various domains of life, the evolution of the tRNA processing enzyme (RNase P) has led to a set of highly diverse architectonic solutions. Bacterial RNase P thus has a fundamentally different structure to human RNase P enzymes in the cell nucleus and mitochondria. This structural ... more
Dennis Walczyk studied chemistry at the Philipps University Marburg. From 2012, he has worked as a research assistant and doctoral candidate in the research group headed by Prof. Dr. Hartmann at the Institute for Pharmaceutical Chemistry at the University of Marburg, where he has been focus ... more
Roland K. Hartmann is Professor of Pharmaceutical Chemistry at the Philipps University of Marburg. He studied biochemistry at the Freie Universität Berlin, where he was awarded the Ernst Reuter Prize in 1988 for his outstanding dissertation work. His research interests include ribozymes (an ... more
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