Advanced Materials

Research Highlights

1-10 of 117 Results

Patterning Semiconductor Building Blocks in 2D Crystals
— 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.

Guidelines Clarify Origins of Ferroelectric Signals
— Recent developments in piezoresponse force microscopy (PFM) and spectroscopy revealed the presence of electromechanical hysteresis loops in a variety of materials including inorganic oxides, polymers and bio systems. This behavior is often (mis)interpreted as evidence of ferroelectricity.

Easy phase transitions spur high piezoelectric responses
— Theoretical calculations, based on newly obtained experimental geometries in strained BiFeO3 thin films, predict an almost barrierless transition between co-existing phases. This facile transition provides insight into the origin of the high electromechanical responses found in coexisting phases in this Pb-free material.

Quantum switch is made in oxide superlattice
— Quantum mechanical resonant tunnelling that yields an extremely large ratio (~105) between the high and low resistance states has been realized in a deliberately designed complex-oxide superlattice. This unprecedented discovery through oxide-based quantum wells (QWs) is a stepping-stone to oxide electronics.

Strain Doping: A New Approach to Understanding and Controlling Advanced Materials
— Helium ions were used to control the length of a single axis in a crystal lattice, allowing for delicate manipulations of complex behavior. This accomplishment unlocks the door to engineering next-generation complex materials.

Electron Beam Guides Engineering of Functional Defects
— The electron beam of a scanning transmission electron microscope was applied to generate Se vacancies in a semiconducting monolayer of MoSe2, provide energy to drive the formation and growth of inversion domains and metallic 60˚ grain boundaries, and track the dynamics.

Oxygen Controls Surface of Epitaxial Manganite Films
— This atomically resolved study revealed a strong link between oxygen pressure and both surface-structure formation and growth dynamics in manganite thin films. The work provides key insights into controlling atomic-level behavior necessary for growing functional materials, such as manganese oxides for electronic and solid-oxide fuel cell applications.

Confining Liquids in Hollow Nanospheres Can Yield Superior Quasi-Solid Electrolytes
— 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.

Materials scientists use ORNL’s CADES to transform big data to ‘smart data’ for rapid image analysis
— Materials scientists use ORNL’s CADES to transform big data to ‘smart data’ for rapid image analysis. ORNL material sciences researchers are collaborating with computer scientists in ORNL’s Compute and Data Environment for Science (CADES) to create a processing and analysis workflow for the expansive scanning probe and electron microscopy data generated at the Center for Nanophase Materials Sciences (CNMS).

True structure of pnictide 122 superconductors revealed
— High-resolution microscopy revealed an unexpected room-temperature crystal structure of the ‘122’ Ba(Fe1-xCox)2As2 superconductors, with domains similar to those in ferroelectrics but with nanometer size.


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