Self-condensation-assisted chemical vapour deposition growth of atomically two-dimensional MOF single-crystals.

Two-dimensional metal-organic frameworks (MOFs) have a wide variety of applications in molecular separation and other emerging technologies, including atomically thin electronics. However, due to the inherent fragility and strong interlayer interactions, high-quality MOF crystals of atomic thickness, especially isolated MOF crystal monolayers, have not been easy to prepare. Here, we report the self-condensation-assisted chemical vapour deposition growth of atomically thin MOF single-crystals, yielding monolayer single-crystals of poly[Fe(benzimidazole)] up to 62 μm in grain sizes.

Na Ba[Na Sn S ]: Structural Tolerance Factor-Guided NLO Performance Improvement.

The strong mutual coupling of and even the opposite change in the key parameters, such as the band gap (E ) and second-order harmonic generation (SHG), leads to the extreme scarcity in high-performance IR nonlinear optical (NLO) chalcogenides. Herein, we report 8 new sulfides, Na Ba[(Ag Na ) Sn S ] (1, x=0; 1 series, x=0.1-0.

Synthesis of a monolayer fullerene network.

Two-dimensional (2D) carbon materials, such as graphene, have attracted particular attention owing to the exceptional carrier transport characteristics that arise from the unique π-electron system in their conjugated carbon network structure. To complement zero-bandgap graphene, material scientists have devoted considerable effort to identifying 2D carbon materials. However, it is a challenge to prepare large-sized single-crystal 2D carbon materials with moderate bandgaps.

A SnS : A Structural Incommensurate Modulation Exhibiting Strong Second-Harmonic Generation and a High Laser-Induced Damage Threshold (A=Ba, Sr).

Structural modulations have been recently found to cause some unusual physical properties, such as superconductivity or charge density waves; however, thus-induced nonlinear optical properties are rare. We report herein two unprecedented incommensurately modulated nonlinear optical sulfides exhibiting phase matching behavior, A SnS (A=Ba, Sr), with the (3+1)D superspace groups P2 2 2(00γ)00s or P2 (α0γ)0, featuring different modulations of the [Sn S ] belts. Remarkably, Ba SnS exhibits an excellent second harmonic generation (SHG) of 1.