DOE News
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    The DOE Science News Source is a Newswise initiative to promote research news from the Office of Science of the DOE to the public and news media.
    • 2015-09-10 13:45:00
    • Article ID: 639725

    SLAC’s Ultrafast ‘Electron Camera’ Visualizes Ripples in 2-D Material

    Understanding Motions of Thin Layers May Help Design Solar Cells, Electronics and Catalysts of the Future

    • Credit: K.-A. Duerloo/Stanford

      Visualization of laser-induced motions of atoms (black and yellow spheres) in a molybdenum disulfide monolayer: The laser pulse creates wrinkles with large amplitudes – more than 15 percent of the layer’s thickness – that develop in a trillionth of a second.

    • Credit: SLAC National Accelerator Laboratory

      Illustrations (each showing a top and two side views) of a single layer of molybdenum disulfide (atoms shown as spheres). Top left: In a hypothetical world without motions, the “ideal” monolayer would be flat. Top right: In reality, the monolayer is wrinkled as shown in this room-temperature simulation. Bottom: If a laser pulse heats the monolayer up, it sends ripples through the layer. These wrinkles, which researchers have now observed for the first time, have large amplitudes and develop on ultrafast timescales.

    • Credit: SLAC National Accelerator Laboratory

      Researchers have used SLAC’s experiment for ultrafast electron diffraction (UED), one of the world’s fastest “electron cameras,” to take snapshots of a three-atom-thick layer of a promising material as it wrinkles in response to a laser pulse. Understanding these dynamic ripples could provide crucial clues for the development of next-generation solar cells, electronics and catalysts.

    • Credit: SLAC National Accelerator Laboratory

      To study ultrafast atomic motions in a single layer of molybdenum disulfide, researchers followed a pump-probe approach: They excited motions with a laser pulse (pump pulse, red) and probed the laser-induced structural changes with a subsequent electron pulse (probe pulse, blue). The electrons of the probe pulse scatter off the monolayer’s atoms (blue and yellow spheres) and form a scattering pattern on the detector – a signal the team used to determine the monolayer structure. By recording patterns at different time delays between the pump and probe pulses, the scientists were able to determine how the atomic structure of the molybdenum disulfide film changed over time.

    Menlo Park, Calif. — New research led by scientists from the Department of Energy’s SLAC National Accelerator Laboratory and Stanford University shows how individual atoms move in trillionths of a second to form wrinkles on a three-atom-thick material. Revealed by a brand new “electron camera,” one of the world’s speediest, this unprecedented level of detail could guide researchers in the development of efficient solar cells, fast and flexible electronics and high-performance chemical catalysts.

    The breakthrough, accepted for publication Aug. 31 in Nano Letters, could take materials science to a whole new level. It was made possible with SLAC’s instrument for ultrafast electron diffraction (UED), which uses energetic electrons to take snapshots of atoms and molecules on timescales as fast as 100 quadrillionths of a second.

    “This is the first published scientific result with our new instrument,” said scientist Xijie Wang, SLAC’s UED team lead. “It showcases the method’s outstanding combination of atomic resolution, speed and sensitivity.”

    SLAC Director Chi-Chang Kao said, “Together with complementary data from SLAC’s X-ray laser Linac Coherent Light Source, UED creates unprecedented opportunities for ultrafast science in a broad range of disciplines, from materials science to chemistry to the biosciences.” LCLS is a DOE Office of Science User Facility.

    Extraordinary Material Properties in Two Dimensions

    Monolayers, or 2-D materials, contain just a single layer of molecules. In this form they can take on new and exciting properties such as superior mechanical strength and an extraordinary ability to conduct electricity and heat. But how do these monolayers acquire their unique characteristics? Until now, researchers only had a limited view of the underlying mechanisms.

    “The functionality of 2-D materials critically depends on how their atoms move,” said SLAC and Stanford researcher Aaron Lindenberg, who led the research team. “However, no one has ever been able to study these motions on the atomic level and in real time before. Our results are an important step toward engineering next-generation devices from single-layer materials.” The research team looked at molybdenum disulfide, or MoS2, which is widely used as a lubricant but takes on a number of interesting behaviors when in single-layer form – more than 150,000 times thinner than a human hair.

    For example, the monolayer form is normally an insulator, but when stretched, it can become electrically conductive. This switching behavior could be used in thin, flexible electronics and to encode information in data storage devices. Thin films of MoS2 are also under study as possible catalysts that facilitate chemical reactions. In addition, they capture light very efficiently and could be used in future solar cells.

    Because of this strong interaction with light, researchers also think they may be able to manipulate the material’s properties with light pulses.

    “To engineer future devices, control them with light and create new properties through systematic modifications, we first need to understand the structural transformations of monolayers on the atomic level,” said Stanford researcher Ehren Mannebach, the study’s lead author.

    Electron Camera Reveals Ultrafast Motions

    Previous analyses showed that single layers of molybdenum disulfide have a wrinkled surface. However, these studies only provided a static picture. The new study reveals for the first time how surface ripples form and evolve in response to laser light.

    Researchers at SLAC placed their monolayer samples, which were prepared by Linyou Cao’s group at North Carolina State University, into a beam of very energetic electrons. The electrons, which come bundled in ultrashort pulses, scatter off the sample’s atoms and produce a signal on a detector that scientists use to determine where atoms are located in the monolayer. This technique is called ultrafast electron diffraction.

    The team then used ultrashort laser pulses to excite motions in the material, which cause the scattering pattern to change over time.

    “Combined with theoretical calculations, these data show how the light pulses generate wrinkles that have large amplitudes – more than 15 percent of the layer’s thickness – and develop extremely quickly, in about a trillionth of a second. This is the first time someone has visualized these ultrafast atomic motions,” Lindenberg said.

    Once scientists better understand monolayers of different materials, they could begin putting them together and engineer mixed materials with completely new optical, mechanical, electronic and chemical properties.

    The research was supported by DOE’s Office of Science, the SLAC UED/UEM program development fund, the German National Academy of Sciences, and the U.S. National Science Foundation.

    SLAC is a multi-program laboratory exploring frontier questions in photon science, astrophysics, particle physics and accelerator research. Located in Menlo Park, California, SLAC is operated by Stanford University for the U.S. Department of Energy Office of Science. To learn more, please visit www.slac.stanford.edu.

    SLAC National Accelerator Laboratory is supported by the Office of Science of the U.S. Department of Energy. The Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit science.energy.gov.

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    Science Snapshots September 2020

    Science Snapshots September 2020

    2D Electronics, Plant Biofactories, Transforming Waste, and Vaccine Development.

    Scientists Capture Candid Snapshots of Electrons Harvesting Light at the Atomic Scale

    Scientists Capture Candid Snapshots of Electrons Harvesting Light at the Atomic Scale

    A team of scientists led by Berkeley Lab has gained important new insight into electrons' role in the harvesting of light in artificial photosynthesis systems.

    Machine Learning Scientists Teach Computers to Read X-Ray Images

    Machine Learning Scientists Teach Computers to Read X-Ray Images

    PNNL researchers used machine learning to develop a tool for a nonprofit to identify orthopedic implants in X-ray images to improve surgical speed and accuracy

    Argonne researchers target lithium-rich materials as key to more sustainable, cost-effective, next-generation batteries

    Argonne researchers target lithium-rich materials as key to more sustainable, cost-effective, next-generation batteries

    Researchers are developing new ways to advance lithium-rich batteries and using new materials for practical use, according to researchers with the U.S. Department of Energy's Argonne National Laboratory.

    Faced with pandemic shortages, researchers combine heat and humidity to disinfect N95 masks for reuse

    Faced with pandemic shortages, researchers combine heat and humidity to disinfect N95 masks for reuse

    They found that gently heating N95 masks in high relative humidity could inactivate SARS-CoV-2 virus trapped within the masks, without degrading the masks' performance.

    Machine Learning Takes on Synthetic Biology: Algorithms Can Bioengineer Cells for You

    Machine Learning Takes on Synthetic Biology: Algorithms Can Bioengineer Cells for You

    Scientists at Lawrence Berkeley National Laboratory have developed a new tool that adapts machine learning algorithms to the needs of synthetic biology to guide development systematically. The innovation means scientists will not have to spend years developing a meticulous understanding of each part of a cell and what it does in order to manipulate it.

    Scientists achieve higher precision weak force measurement between protons, neutrons

    Scientists achieve higher precision weak force measurement between protons, neutrons

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    Novel cell membrane model could be key to uncovering new protein properties

    Novel cell membrane model could be key to uncovering new protein properties

    Researchers have recently shed light on how cell membrane proteins could be influenced by the lipids around them. By developing a novel type of membrane model, they were able to show that the shape and behavior of a protein can be altered by exposure to different lipid compositions. The research team confirmed the artificial membrane's structure using x-ray and neutron scattering at the Department of Energy's (DOE's) Brookhaven (BNL) and Oak Ridge National Laboratories (ORNL).

    SLAC invention could make particle accelerators 10 times smaller

    SLAC invention could make particle accelerators 10 times smaller

    A team led by scientists at the Department of Energy's SLAC National Accelerator Laboratory has invented a new type of accelerator structure that could make accelerators used for a given application 10 times shorter.

    Active learning accelerates redox-flow battery discovery

    Active learning accelerates redox-flow battery discovery

    In a new study from the U.S. Department of Energy's Argonne National Laboratory, researchers are accelerating the hunt for the best possible battery components by employing artificial intelligence.


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    American Physical Society Announces Five 2020 Fellows Affiliated with Jefferson Lab

    American Physical Society Announces Five 2020 Fellows Affiliated with Jefferson Lab

    Five researchers who are affiliated with the U.S. Department of Energy's Thomas Jefferson National Accelerator Facility have been selected by their professional peers for the distinct honor of Fellow of the American Physical Society.

    Fermilab scientists selected as APS fellows

    Fermilab scientists selected as APS fellows

    Three Fermilab scientists have been selected 2020 fellows of the American Physical Society, a distinction awarded each year to no more than one-half of 1 percent of current APS members by their peers.

    Renowned physicist and former diagnostics developer at PPPL wins Asia Pacific plasma physics award

    Renowned physicist and former diagnostics developer at PPPL wins Asia Pacific plasma physics award

    Hyeon Park honored with 2020 Subramanyan Chandrasekhar Prize for Plasma Physics from the Division of Plasma Physics of the Association of Asia Pacific Physical Societies. The prize recognizes Park for his work developing an essential diagnostic tool for tokamak fusion facilities throughout the world.

    The American Nuclear Society designates the groundbreaking Tokamak Fusion Test Reactor a Nuclear Historic Landmark

    The American Nuclear Society designates the groundbreaking Tokamak Fusion Test Reactor a Nuclear Historic Landmark

    The record-setting PPPL tokamak that laid the foundation for future fusion power plants receives the distinguished landmark designation from the the American Nuclear Society.

    Brian O'Neill Named New Director for the Joint Global Change Research Institute

    Brian O'Neill Named New Director for the Joint Global Change Research Institute

    O'Neill to lead organization that advances scientific understanding of the ways in which human, energy and environmental systems interact, and has provided input to the White House, Congress, United Nations and other national and international governing and advising bodies.

    SLAC's Xijie Wang wins prestigious accelerator science award

    SLAC's Xijie Wang wins prestigious accelerator science award

    Xijie Wang, an accelerator physicist at the Department of Energy's SLAC National Accelerator Laboratory, will receive the 2021 Nuclear and Plasma Science Society's Particle Accelerator Science and Technology Award. Bestowed by the Institute of Electrical and Electronics Engineers (IEEE), the prestigious award recognizes individuals who have made outstanding contributions to the development of particle accelerator science and technology.

    Argonne materials scientist Arturo Gutierrez named 2020 Luminary Honoree by HENAAC

    Argonne materials scientist Arturo Gutierrez named 2020 Luminary Honoree by HENAAC

    Argonne materials scientist Arturo Gutierrez has been recognized by HENAAC, the national organization that honors Hispanic scientists and engineers.

    DOE Funding Boosts Artificial Intelligence Research at Jefferson Lab

    DOE Funding Boosts Artificial Intelligence Research at Jefferson Lab

    Two physicists at DOE's Jefferson Lab have secured $2.16 million in funding for projects that harness the power of data analytics to make the work of studying the universe down to its smallest subatomic parts faster and more efficient.

    Argonne National Laboratory and AT&T extend climate resiliency project nationwide

    Argonne National Laboratory and AT&T extend climate resiliency project nationwide

    Argonne and AT&T have been working together to project risks from changing climate on America's Southeastern region. Today they've announced that they're extending their analysis to cover the entire contiguous U.S.

    Key Partners Mark Launch of Electron-Ion Collider Project

    Key Partners Mark Launch of Electron-Ion Collider Project

    U.S. Department of Energy (DOE) Undersecretary for Science Paul Dabbar, leaders from DOE's Brookhaven National Laboratory (Brookhaven Lab) and Thomas Jefferson National Accelerator Facility (Jefferson Lab), and elected officials from New York State and Virginia today commemorated the start of the Electron-Ion Collider project.


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    Harvesting Energy from Light using Bio-inspired Artificial Cells

    Harvesting Energy from Light using Bio-inspired Artificial Cells

    Scientists designed and connected two different artificial cells to each other to produce molecules called ATP (adenosine triphosphate).

    Engineering Living Scaffolds for Building Materials

    Engineering Living Scaffolds for Building Materials

    Bone and mollusk shells are composite systems that combine living cells and inorganic components. This allows them to regenerate and change structure while also being very strong and durable. Borrowing from this amazing complexity, researchers have been exploring a new class of materials called engineered living materials (ELMs).

    Excavating Quantum Information Buried in Noise

    Excavating Quantum Information Buried in Noise

    Researchers developed two new methods to assess and remove error in how scientists measure quantum systems. By reducing quantum "noise" - uncertainty inherent to quantum processes - these new methods improve accuracy and precision.

    How Electrons Move in a Catastrophe

    How Electrons Move in a Catastrophe

    Lanthanum strontium manganite (LSMO) is a widely applicable material, from magnetic tunnel junctions to solid oxide fuel cells. However, when it gets thin, its behavior changes for the worse. The reason why was not known. Now, using two theoretical methods, a team determined what happens.

    When Ions and Molecules Cluster

    When Ions and Molecules Cluster

    How an ion behaves when isolated within an analytical instrument can differ from how it behaves in the environment. Now, Xue-Bin Wang at Pacific Northwest National Laboratory devised a way to bring ions and molecules together in clusters to better discover their properties and predict their behavior.

    Tune in to Tetrahedral Superstructures

    Tune in to Tetrahedral Superstructures

    Shape affects how the particles fit together and, in turn, the resulting material. For the first time, a team observed the self-assembly of nanoparticles with tetrahedral shapes.

    Tracing Interstellar Dust Back to the Solar System's Formation

    Tracing Interstellar Dust Back to the Solar System's Formation

    This study is the first to confirm dust particles pre-dating the formation of our solar system. Further study of these materials will enable a deeper understanding of the processes that formed and have since altered them.

    Investigating Materials that Can Go the Distance in Fusion Reactors

    Investigating Materials that Can Go the Distance in Fusion Reactors

    Future fusion reactors will require materials that can withstand extreme operating conditions, including being bombarded by high-energy neutrons at high temperatures. Scientists recently irradiated titanium diboride (TiB2) in the High Flux Isotope Reactor (HFIR) to better understand the effects of fusion neutrons on performance.

    Better 3-D Imaging of Tumors in the Breast with Less Radiation

    Better 3-D Imaging of Tumors in the Breast with Less Radiation

    In breast cancer screening, an imaging technique based on nuclear medicine is currently being used as a successful secondary screening tool alongside mammography to improve the accuracy of the diagnosis. Now, a team is hoping to improve this imaging technique.

    Microbes are Metabolic Specialists

    Microbes are Metabolic Specialists

    Scientists can use genetic information to measure if microbes in the environment can perform specific ecological roles. Researchers recently analyzed the genomes of over 6,000 microbial species.


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