Characteristics, Properties, Synthesis and Advanced Applications of 2D Graphdiyne vs Graphene

Like graphene, graphdiyne is a newly discovered two-dimensional planar carbon allotrope with uniform pores and highly π-conjugated interactions. It shows a lot of affinities with graphene in properties and applications....

Controlled Growth of Porous InBr3: PbBr2 Film for Preparation of CsPbBr3 in Carbon-Based Planar Perovskite Solar Cells

Due to the low solubility of CsBr in organic solvents, the CsPbBr3 film prepared by the multi-step method has holes and insufficient thickness, and the light absorption capacity and current density of the perovskite film hinder the further improvement in the power conversion efficiency (PCE) of CsPbBr3 solar cells. In this study, we introduced InBr3 into the PbBr2 precursor solution and adjusted the concentration of PbBr2, successfully prepared PbBr2 with a porous structure on the compact TiO2 (c-TiO2) substrate to ensure that it fully reacted with CsBr, and obtained the planar carbon-based CsPbBr3 solar cells with high-quality perovskite film. The results reveal that the porous PbBr2 structure and the increasing PbBr2 concentration are beneficial to increase the thickness of the CsPbBr3 films, optimize the surface morphology, and significantly enhance the light absorption capacity. Finally, the PCE of the CsPbBr3 solar cells obtained after conditions optimization was 5.76%.

Spectroscopic Evidence of New Low-Dimensional Planar Carbon Allotropes Based on Biphenylene via On-Surface Ullmann Coupling

The bottom-up synthesis and preliminary characterizations of a new biphenylene-based 2D framework are presented. This new low-dimensional carbon allotrope potentially completes the many hypothesized carbon networks based on biphenylene.

Planar nitrogen compared to planar carbon in a series of compounds: the effect of replacing with nitrogen the potentially planar tetracoordinate carbon of a series of polycyclic alkanes

Previous work by Radom and Rasmussen had been extended by the author (2019, Can. J. Chem.) to identify a smaller (C17H16 cf. C23H24) polycyclic alkane with a potentially planar tetracoordinate “central” carbon. Here the series of alkanes in that latter study were computationally modified by replacing the central carbon with isoelectronic nitrogen, N+. A series of six ammonium ions was found by ab initio calculations to potentially all, with one exception, harbour a planar tetracoordinate nitrogen in a potential energy relative minimum, at the MP2/6-31G* and MP2/(large basis) levels, as indicated by the absence of an imaginary vibrational frequency. This is in contrast to the hydrocarbons, where only two such structures were indicated to be relative minima. Key words: planar tetracoordinate carbon, planar tetracoordinate nitrogen, ab initio calculations.

Voltammetric bienzymatic sensor for sucrose determination in honey

An electrochemical sensor based on nanostructured planar carbon electrodes (nanoSPCE) modified with a SiO2 biocomposite film containing MnO2 particles and enzymes glucose oxidase and invertase was developed. MnO2 particles obtained by electrochemical deposition possessed electrocatalytic activity toward hydrogen peroxide. Glucose oxidase (GOx) and invertase (Inv) were encapsulated into SiO2 film by method of electroassisted deposition. The electrode modified with biocomposite film nanoSPCE/MnO2/GoX/Inv/SiO2 was electroactive toward sucrose. The indicator reaction was oxidation of H2O2 – the product of bienzymatic reaction which was catalyzed by MnO2 on the electrode surface. The linearity range of the calibration graph for the voltametric determination of sucrose using developed modified electrode is 0.017-0.342 mg/ml, the detection limit is 0.006 mg/ml. The obtained nanoSPCE/MnO2/GoX/Inv/SiO2 electrode demonstrated satisfactory stability of the analytical signal during one month of operation. The developed method was used for sucrose determination in the honey samples. The 50-fold molar excess of glucose and fructose does not interfere the determination of sucrose.

First-principles investigation of CO and CO$_2$ adsorption on intrinsic and Fe-doped planar carbon allotrope net-Y

A new planar carbon allotrope named net-Y with periodic four-six-eight-membered carbon rings has been synthesized in the experiment. In this paper, the adsorption properties of CO and CO2 on the...