MoS stacking matters: 3R polytype significantly outperforms 2H MoS for the hydrogen evolution reaction.

Transition metal dichalcogenides (TMDs) are an intriguing family of materials with large application potential in a variety of scientific fields ranging from electronics to electrocatalysis. Within this group of materials, MoS has been attracting a lot of scientific attention due to its chemical and physical properties. In this report, we studied the exfoliation of the largely unexplored 3R MoS polytype prepared by high-temperature, high-pressure synthesis.

On the Role of CsPbBr Phase in the Luminescence Performance of Bright CsPbBr Nanocrystals.

CsPbBr nanocrystals have been identified as a highly promising material for various optoelectronic applications. However, they tend to coexist with CsPbBr phase when the reaction conditions are not controlled carefully. It is therefore imperative to understand how the presence of this phase affects the luminescence performance of CsPbBr nanocrystals We synthesized a mixed CsPbBr-CsPbBr sample, and compared its photo- and radioluminescence properties, including timing characteristics, to the performance of pure CsPbBr nanocrystals.

Surface Properties of 1DTiO Microrods Modified with Copper (Cu) and Nanocavities.

This work deals with Cu-modified 1DTiO microrods (MRs) and their surface properties. The pristine lyophilized precursor Cu_1DTiO, prepared by an environmentally friendly cryo-lyophilization method, was further annealed in the temperature interval from 500 to 950 °C. The microstructure of all samples was characterized by electron microscopy (SEM/EDS and HRTEM/SAED), X-ray powder diffraction (XRD), infrared spectroscopy, simultaneous DTA/TGA thermoanalytical measurement, and mass spectroscopy (MS).

Core-shell ZnO:Ga-SiO nanocrystals: limiting particle agglomeration and increasing luminescence surface defect passivation.

Heat treatment is needed to increase the luminescence intensity of ZnO:Ga particles, but it comes at the cost of higher particle agglomeration. Higher agglomeration results in low transparency of scintillating powder when embedded in a matrix and constitutes one of the biggest disadvantages, besides low light yield and low stopping power, of ZnO:Ga powder. Limiting ZnO:Ga particle size is therefore a key step in order to prepare highly luminescent and transparent composites with prospects for optical applications.