Scientists at the National University of Singapore (NUS) have demonstrated a new way of controlling electrons by confining them in a device made out of atomically thin materials, and applying external electric and magnetic fields. This research, published on Dec. 23, 2015 in the prestigious scientific journal Nature, was led by Professor Antonio Castro Neto and his research team at the Centre for Advanced 2D Materials (CA2DM) of the NUS Faculty of Science.Almost all modern technology like motors, light bulbs and semiconductor chips runs on electricity, harnessing the flow of electrons through devices. Explained Prof Castro Neto, “Not only are electrons small and fast, they naturally repel each other due to their electric charge. They obey the strange laws of quantum physics, making it difficult to control their motion directly.”To control electron behaviour, many semiconductor materials require chemical doping, where small amounts of a foreign material are embedded in … [Read more...] about Choreographing the dance of electrons
Journal of electronic materials
A new paper by University of Notre Dame researchers describes their investigations of the fundamental optical properties of a new class of semiconducting materials known as organic-inorganic “hybrid” perovskites.The research was conducted at the Notre Dame Radiation Laboratory by Joseph Manser, a doctoral student in chemical and biomolecular engineering, under the direction of Prashant Kamat, Rev. John A. Zahm Professor of Science. The findings appear in a paper in the August 10 edition of the journal Nature Photonics.The term “perovskites” refers to the structural order these materials adopt upon drying and assembling in the solid state.“Hybrid perovskites have recently demonstrated exceptional performance in solid-state thin film solar cells, with light-to-electricity conversion efficiencies approaching nearly 20 percent,” Manser said. “Though currently only at the laboratory scale, this efficiency rivals that of commercial solar cells based … [Read more...] about Notre Dame paper offers insights into a new class of semiconducting materials
Supercomputers 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 around the world are looking for alternatives. One method could be the self-organization of complex components from molecules and atoms. Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) and Paderborn University have now made an important advance: the physicists conducted a current through gold-plated nanowires, which independently assembled themselves from single DNA strands. Their results have been published in the scientific journal Langmuir.At first glance, it resembles wormy lines in front of a black background. But what the electron microscope shows up close is that the nanometer-sized structures connect two electrical contacts. Dr. Artur Erbe from the Institute of … [Read more...] about Computers Made of Genetic Material?
Data Analysis Study of electron orbits in multilayer graphene finds unexpected energy gapsResearchers have taken one more step toward understanding the unique and often unexpected properties of graphene, a two-dimensional carbon material that has attracted interest because of its potential applications in future generations of electronic devices. In the Aug. 8 advance online edition of the journal Nature Physics, researchers from the Georgia Institute of Technology and the National Institute of Standards and Technology (NIST) describe for the first time how the orbits of electrons are distributed spatially by magnetic fields applied to layers of epitaxial graphene. The research team also found that these electron orbits can interact with the substrate on which the graphene is grown, creating energy gaps that affect how electron waves move through the multilayer material. These energy gaps could have implications for the designers of certain graphene-based electronic devices. "The … [Read more...] about Study of electron orbits in multilayer graphene finds unexpected energy gaps
Researchers have developed a new technique that could improve nuclear nonproliferation and enhance security applications for nuclear waste.This method, developed at North Carolina State University, enables scientists to characterize nuclear material in a location even after the material has been removed.“Basically, we can see nuclear material that is no longer there,” Robert Hayes, lead author of paper describing the work and an associate professor of nuclear engineering at North Carolina State University, said in a statement. “For example, we could identify and characterize a dirty bomb based on samples taken from a room the bomb was in a year ago.“This is a valuable tool for emergency responders, nuclear nonproliferation authorities and forensics, because it allows us to get a rough snapshot of the size of a radiation source, where it was located, how radioactive it is and what type of radioactive material it is,” he added.The team took advantage of … [Read more...] about Novel Technique Identifies Traces of Radioactive Material