Monolayer Molybdenum disulfide (MoS 2 ), a two-dimensional crystal with a direct bandgap, is a promising candidate for 2D nanoelectronic devices complementing graphene. There have been recent attempts to produce MoS 2 layers via chemical and mechanical exfoliation of bulk material. Here we demonstrate the large area growth of

A simple synthesis of high‐quality Cu2O, a material of high interest in optics because of its photon exciton interconversion properties, in the form of nanowires (see Figure for a TEM image) is reported by the authors. Reduction of Cu(OH)2, freshly prepared from CuCl2, with hydrazine hydrate in basic solution in the presence of the surfactant polyethylene glycol (PEG) yields Cu2O nanowires 5–8 nm in diameter and 10–20 nm long.

Building entire multiple-component devices on single nanowires is a promising strategy for miniaturizing electronic applications. Here we demonstrate a single nanowire capacitor with a coaxial asymmetric Cu-Cu 2 o-C structure, fabricated using a two-step chemical reaction and vapour deposition method. The capacitance measured from a single nanowire device corresponds to ~140 µF cm − 2 , exceeding previous reported values for metal-insulator-metal micro-capacitors and is more than one order of magnitude higher than what is predicted by classical electrostatics. Quantum mechanical calculations indicate that this unusually high capacitance may be attributed to a negative quantum capacitance of the dielectric-metal interface, enhanced significantly at the nanoscale.

Single-crystalline trigonal tellurium (t-Te) nanotubes with sloping cross-section and hexagonal cross-section can be selectively synthesized on a large scale by a simple solvothermal reduction route, using tellurium dioxide (TeO 2 ) as tellurium source and ethylene glycol (EG) as both a reducing agent and a solvent in the presence of cetyltrimethyl ammonium bromide (CTAB) and cellulose acetate (CA), respectively. The individual Te nanotubes with cylindrical morphology and open ends have outer diameters of 100-500 nm, wall thicknesses of 50-100 nm, and lengths of 150-200 µm. Both kinds of Te nanotubes grow along the [001] direction and have excellent crystallinity. The optical properties and the stability in ethanol of the t-Te nanotubes with sloping cross section have been investigated.