Researchers found that a multilayer stack of ultrathin materials exhibits a phenomenon called negative capacitance, which reduces the voltage required for transistor operation. The material is fully compatible with today’s silicon-based technology and is capable of reducing power consumption without sacrificing transistor size or performance. Read more »
ALS Work Using XAS
In x-ray absorption spectroscopy (XAS), the incident x-ray energy is tuned over a range that will excite core-level electrons. Sharp increases in absorption occur at specific energies, characteristic of the absorbing element. The resulting spectra probe the elemental composition as well as the chemical and electronic structure of the material.
Jinghua Guo to Receive the 2022 Shirley Award
ALS senior scientist Jinghua Guo is the recipient of this year’s Shirley Award for Outstanding Scientific Achievement at the ALS. Guo is being recognized for pioneering the development of operando soft x-ray spectroscopy, work that’s enabled studies under realistic conditions, which is of great importance in environmental and energy research. Read more »
Operando Study of CO2 Reduction by Copper Nanoparticles
Since copper is necessary to catalyze the reduction of CO2, a greenhouse gas, to valuable products, scientists are working hard to improve its selectivity and activity. Now, researchers have developed an operando capability that can help in this effort by simultaneously probing chemical valence and interparticle dynamics. Read more »
Exploring Critical Synthetic Parameters for Nanoscale ε-Fe2O3 and Their Influence on Magnetic Behaviors
An intermediate polymorph of iron oxide, ε-Fe2O3, has attracted significant attention for potential applications in high-frequency mm-wave absorption and high-density magnetic recording. However, fabrication is still a challenge. Here, we identified critical reaction parameters to improve the phase purity and tested their effects. Read more »
Revealing Lithium Metal’s Electronic Structure
Spectroscopy at the ALS and theoretical calculations at the Molecular Foundry revealed the intrinsic spectroscopic signature of lithium metal and explained the origin of previous contradictory reports. The findings provide a benchmark for further studies of lithium compounds towards batteries with higher capacity and energy density. Read more »
Synthesis of new two-dimensional titanium carbonitride Ti2C0.5N0.5Tx MXene and its performance as an electrode material for sodium-ion battery
Researchers report on the synthesis and characterization of a new 2D carbonitride MXene, Ti2C0.5N0.5. They explore the performance of this new MXene as electrode materials for sodium-ion batteries (SIBs). It outperformed its carbide counterpart (i.e., Ti2C) and all the other reports for multilayer MXenes in SIBs, and it showed a stable electrochemical performance over 500 cycles. Read more »
How Iron Remediates Arsenic in Groundwater
Though iron has been demonstrated as an effective means to remediate arsenic contamination in groundwater, the mechanism was not well understood until now. For the first time, researchers have untangled the detailed steps of the interaction, informing more robust strategies for cleanup. Read more »
Trace Key Mechanistic Features of the Arsenite Sequestration Reaction with Nanoscale Zerovalent Iron
The advancing in situ XAS technique made it possible to uncover the As-nZVI reaction pathway, especially capturing transient reaction process at subsecond scale. Combining the in situ XAS experimental data with computational chemistry enabled the reaction steps to be verified, clarifying the unambiguous identification of the transit reactive intermediates. Read more »
A Two-Dimensional Room-Temperature Magnet
Researchers have made the world’s thinnest (one atom thick) magnet that’s chemically stable under ambient conditions. The two-dimensional material, magnetically characterized at the ALS, could enable big advances in next-generation memory devices, computing, spintronics, and quantum physics. Read more »
David Prendergast Wins 2021 Shirley Award
David Prendergast, an internationally recognized computational scientist whose first-principles calculations of x-ray spectra have helped with the interpretation of countless experiments done at the ALS, has been awarded the 2021 Shirley Award for Outstanding Scientific Achievement by the ALS Users’ Executive Committee. Read more »
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