Alternating current properties of bulk- and nanosheet-graphitic carbon nitride compacts at elevated temperatures.

The investigations of temperature-dependent electrical properties in graphitic carbon nitride (g-CN) have been largely performed at/below room temperature on devices commonly fabricated by vacuum techniques, leaving the gap to further explore its behaviors at high-temperature. We reported herein the temperature dependence (400 → 35 °C) of alternating current (AC) electrical properties in bulk- and nanosheet-g-CN compacts simply prepared by pelletizing the powder. The bulk sample was synthesized the direct heating of urea, and the subsequent HNO-assisted thermal exfoliation yielded the nanosheet counterpart.

Ternary pentagonal BXN (X = C, Si, Ge, and Sn) sheets with high piezoelectricity.

The discovery of new and stable two-dimensional pentagonal materials with piezoelectric properties is essential for technological advancement. Inspired by recently reported piezoelectric materials -BCN and -BSiN, we proposed -BGeN and -BSnN as new members of the -family based on first-principles calculations. Comprehensive analyses indicated that both -BGeN and -BSnN are thermodynamically, dynamically, mechanically, and thermally stable.

Theoretically proposed stable polymorph of two-dimensional pentagonal β-PdPSe.

The theoretical discovery of new and stable 2D penta materials based on first-principles calculations has stimulated technological advances due to the anticipated exotic properties of such structures, which include the α and β phases of penta-NiPS. Inspired by the similarity between the theoretically proposed penta-NiPS and the experimentally synthesized (α phase) of penta-PdPSe, we propose herein the β phase of penta-PdPSe as a new penta-2D material. Comprehensive analyses indicated that β phase penta-PdPSe is thermodynamically, dynamically, mechanically, and thermally stable, similar to its NiPS analogue.

Towards a new packing pattern of Li adsorption in two-dimensional pentagonal BCN.

Two-dimensional (2D) materials with a penta-atomic-configuration, such as penta-graphene and penta-BC, have received great attention as anodes in Li-ion batteries (LIBs). Recently, penta-BCN has been demonstrated to exhibit the highest theoretical capacity to date of 2183 mA h g, corresponding to the composition LiBCN. Herein, we study the layer-by-layer Li adsorption on penta-BCN by explicitly and comprehensively considering its structure.

Author Correction: Stacking stability of CN bilayer nanosheet.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Stacking stability of CN bilayer nanosheet.

In recent years, a 2D graphene-like sheet: monolayer CN was synthesized via a simple wet-chemical reaction. Here, we studied the stability and electronic properties of bilayer CN. According to a previous study, a bilayer may exist in one of three highly symmetric stacking configurations, namely as AA, AB and AB'-stacking.