Atomically engineering interlayer symmetry operations of two-dimensional crystals.

Crystal symmetry, which governs the local atomic coordination and bonding environment, is one of the paramount constituents that intrinsically dictate materials' functionalities. However, engineering crystal symmetry is not straightforward due to the isotropically strong covalent/ionic bonds in crystals. Layered two-dimensional materials offer an ideal platform for crystal engineering because of the ease of interlayer symmetry operations.

Memristor Array Based on Wafer-Scale 2D HfS for Dual-Mode Physically Unclonable Functions.

Conventional Si-based physically unclonable functions (PUFs) take advantage of the unique variations in the fabrication processes. However, these PUFs are hindered by limited entropy sources and susceptibility to noise interference. Here we present a memristive device based on wafer-scale (2-in.

Plasmon-assisted nanophase engineering of titanium dioxide for improved performances in single-particle based sensing and photocatalysis.

Titanium dioxide (TiO) due to its large bandgap, has a very limited efficiency in utilizing sunlight for photocatalysis and photoanode applications. Sensitizing with metallic nanoparticles is one of the promising routes for resolving this issue but it requires thermal annealing and proper bandgap engineering to optimize the Schottky junctions. Here we use plasmonic nanoheating to locally anneal the TiO medium with a sub-nanometer (sub-nm) feature, which results in a nanophase transition from amorphous TiO to anatase and rutile with a gradient configuration.