Efficient C(sp)-H Bond Oxidation on Perovskite Quantum Dots Based on Ce-Oxygen Affinity.

Perovskite quantum dots (QDs) have shown attractive prospects in the field of visible photocatalysis, especially in the synthesis of high value-added chemicals. However, under aerobic conditions, the stable operation of QD catalysts has been limited by the reactive oxygen species (ROS) generated by photoexcitation, especially superoxide species O⋅. Here, we propose a strategy of Ce doping in perovskite QDs to guide superoxide species for photocatalytic oxidation reactions.

Orientation-polarization dependence of pressure-induced Raman anomalies in anisotropic 2D ReS.

We report an high-pressure (0-30.24 GPa) optical study of the 2D ReS crystal under four specific configurations of sample orientation and laser polarization. Unlike the horizontal measurement configuration that has been widely used, under the vertical sample configuration we observe the anomalous disappearance behavior of Raman modes.

Analyzing Anisotropy in 2D Rhenium Disulfide Using Dichromatic Polarized Reflectance.

In-plane anisotropy in 2D rhenium disulfide (ReS ) offers intriguing opportunities for designing future electronic and optical devices, and toward such applications, it is crucial to identify the crystal orientation in such 2D anisotropic materials. Existing spectroscopy or electron microscopy methods for determining the crystalline orientation often require complicated sample preparing procedures and specialized equipment, which could sometimes limit their application. In this work, a dichromatic polarized reflectance method is demonstrated, which can quickly and accurately resolve the crystal orientation (Re-Re chain) in 2D ReS crystals with different thicknesses.