Two-dimensional materials that can multitask.
That is the result of a new process that naturally produces patterned monolayers that can act as a base for creating a wide variety of novel materials with dual optical, magnetic, catalytic or sensing capabilities.
"Patterned materials open up the possibility of having two functionalities in a single material, such as catalyzing a chemical reaction while simultaneously serving as a sensor for a second set of molecules," said Sokrates Pantelides, William and Nancy McMinn Professor of Physics at Vanderbilt University, who coordinated the research with Professor Hong-Jun Gao at the Institute of Physics of the Chinese Academy of Sciences in Beijing. "Of course, you can do such a thing by using two materials side by side, but patterned materials offer a whole range of new options for device designers."
Their achievement is described in a paper titled "Intrinsically patterned two-dimensional materials for selective adsorption of molecules and nanoclusters" published Jun. 12 in the journal Nature Materials.
In electronics, two dimensional (2D) materials are a hot topic because of their many potential applications. Graphene, which consists of a single sheet of carbon atoms, has received the most attention, but it has proven very difficult to tune its chemical and electrical properties. As a result, chalcogenides (materials that contain sulfur, selenium or tellurium, which are known for their widely varied optical, electrical and thermal properties) are now the focus of worldwide research because some of them naturally form monolayers that can serve as blank slates that are readily tailored for specific applications.
Now, Pantelides and his collaborators have shown that monolayers formed by two chalcogenides (platinum-selenium and copper-selenium) naturally combine with nanoscale precision into alternating triangles with different phases: metallic and semiconductor. Because each phase has different electrical and chemical properties, two different types of molecules can bond to its surface, allowing it to perform two functions simultaneously.
"In general, 2D materials are 'functionalized' for specific applications by adsorbing different species of atoms or molecules on them or by embedding impurities in their otherwise perfect crystalline structure in the same way that semiconductors such as silicon are functionalized by doping with impurities, which enables the fabrication of electronic devices, such as the 'chips' that drive computers," Pantelides explained. "Our new paper extends the realm of 2D materials by one important step. It demonstrates a way to fabricate 2D materials that allows the two phases of the material to be functionalized independently."
The experiments were conducted in Gao's laboratory in Beijing and theoretical calculations were performed at Vanderbilt, the U.S Department of Energy's National Energy Research Scientific Computing Center and the University of the Chinese Academy of Sciences.
The research was funded by U.S. Department of Energy grants DE-FG02-09ER46554, National Key Research and Development Projects of China (2016YFA0202300), the National Basic Research Program of China (2013CBA01600) and the National Natural Science Foundation of China (61390501, 51572290, 61306015 and 61471337, 51325204) and the Chinese Academy of Sciences (1731300500015, XDB07030100.)
David F Salisbury | EurekAlert!
Spider silk key to new bone-fixing composite
20.04.2018 | University of Connecticut
Diamond-like carbon is formed differently to what was believed -- machine learning enables development of new model
19.04.2018 | Aalto University
University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.
Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.
Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.
Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...
Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.
The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...
Stable joint cartilage can be produced from adult stem cells originating from bone marrow. This is made possible by inducing specific molecular processes occurring during embryonic cartilage formation, as researchers from the University and University Hospital of Basel report in the scientific journal PNAS.
Certain mesenchymal stem/stromal cells from the bone marrow of adults are considered extremely promising for skeletal tissue regeneration. These adult stem...
In the fight against cancer, scientists are developing new drugs to hit tumor cells at so far unused weak points. Such a “sore spot” is the protein complex...
13.04.2018 | Event News
12.04.2018 | Event News
09.04.2018 | Event News
20.04.2018 | Physics and Astronomy
20.04.2018 | Interdisciplinary Research
20.04.2018 | Physics and Astronomy