New Method Probes Nanoscale Electrostatic Effects
October 29, 2014 — Electrostatic forces were used to observe charge transfer at the nanoscale between metal and dielectric materials. A new technique was developed to access information about charge transfer, which is a key component in processes such as storage in flash memories, electroforming in memristors, surface electrochemistry, and triboelectricity.
Digital Transfer Growth of Patterned 2D Metal Chalcogenides by Confined Nanoparticle Evaporation
October 28, 2014 — Researchers demonstrated a novel growth technique for the controlled synthesis of monolayer or few-layer 2D metal chalcogenide crystals that should prove useful for their scaled production for optoelectronic and energy applications.
A High-Energy Solid State Battery with an Extremely Long Cycle Life
October 15, 2014 — A high-voltage (5V) solid state battery has been demonstrated to have an extremely long cycle life of over 10,000 cycles. For a given size of battery, the energy stored in a battery is proportional to its voltage. Conventional lithium-ion batteries use organic liquid electrolytes that have a maximum operating voltage of 4.3 V.
Characterizing Performance of Nanostructured Alloys for Extreme Environments
October 14, 2014 — In situ neutron diffraction characterization of strains in nanostructured materials reveals, for the first time, a large temperature-sensitive elastic anisotropy and a deformation crossover upon extensive straining. The novel approach utilized to determine single-crystal elastic constants provides a new strategy for characterizing anisotropic elasticity of complex materials.
Tracking dopant diffusion pathways in bulk semiconductors
October 07, 2014 — A scanning transmission electron microscope (STEM) is used to locally excite and directly image the diffusion of single dopant atoms inside bulk single crystals. Although diffusion is a fundamental process that governs the structure, processing and properties of most materials, direct observations of diffusion processes have been elusive and limited to the surfaces of materials, until this work.