Patterning Semiconductor Building Blocks in 2D Crystals
July 22, 2015 — For the first time, researchers have synthesized lateral semiconductor heterojunctions in lithographically patterned arrays within a two-dimensional semiconductor crystal monolayer by a novel process that selectively converted exposed regions of a monolayer of MoSe2 to MoS2 using laser-deposited sulfur.
Confining Liquids in Hollow Nanospheres Can Yield Superior Quasi-Solid Electrolytes
May 06, 2015 — The growth and proliferation of lithium dendrites during cell recharge seriously hinder development and application of rechargeable Li-metal batteries. Researchers developed a promising strategy for fabrication of quasi−solid electrolytes with superior lithium ionic conductivities, by using a hollow silica (HS) nanosphere-film architecture that blocks dendrites.
World's Thinnest Proton Channel
March 18, 2015 — Graphene is a single-atom thin 2-dimensional array of carbon atoms that represents a barrier that is impenetrable even to protons unless graphene membrane has macroscopic holes.
Review Finds Ionization Can Heal or Harm Materials
February 06, 2015 — An invited review on latest advances in ion beam modification of materials provides conclusive evidence that energy loss by energetic ions to electrons (ionization) can lead to either self-healing of radiation damage created by atomic collisions or contribute to radiation damage.
Iodine-coordinated sulfide leads to an exceptionally stable ceramic electrolyte
February 04, 2015 — Coordination of iodine atoms within the Li3PS4 (LPS) electrolyte results in a new ceramic electrolyte with the formulation Li7P2S8I, a coordinated material between LPS and LiI. This new formulation takes advantage of the chemical stability of LiI to render an electrolyte with excellent compatability with Li anode.
Thin magnetic crystals are path to ferromagnetic graphene
January 23, 2015 — Chromium triiodide (CrI3) crystals were identified as a promising platform for studying how magnetism can enhance electronic behaviors in materials that are only a few atoms thick. Development of such ultra-thin magnetic materials may be crucial for continued advancement in miniaturization and performance enhancement of electronic devices.
Synergy of Ionization with Defects Creates Amorphous Track
January 13, 2015 — A colossal synergy, orders of magnitude larger than anything previously reported, has been discovered to occur between electronic energy loss by ions and pre-existing atomic defects created by elastic energy loss in single-crystal strontium titanate (SrTiO3). This synergy results in the formation of nanometer-sized amorphous tracks, but only in the region with pre-existing defects.
Single Supported Atoms Participate in Catalytic Processes
December 04, 2014 — Researchers recently predicted and demonstrated that single supported Pt atoms are highly active for NO oxidation. This work will impact determining the optimum loading of noble metals on emissions-treatment catalysts and design of low-temperature catalysts.
Understanding Why Silicon Anodes of Lithium-Ion Batteries Are Fast to Discharge but Slow to Charge
December 02, 2014 — Silicon anodes for lithium-ion batteries are capable of quickly delivering high power but charge at a much lower rate. High-power and high-rate performance of batteries is determined by the intrinsic electrochemical reaction rates. The forward and backward reaction rates for reversible electrochemical reactions are not necessarily identical.
Stable Separator Identified for High-Energy Batteries
November 04, 2014 — State-of-the-art scanning transmission electron microscopy (STEM) unveiled the structural stability of lithium lanthanum zirconium oxide (LLZO) garnet in aqueous media.