Controllable Synthesis of Cu₂O Microcrystals via a Complexant‐Assisted Synthetic Route

Abstract

A novel method using Cu(AC) 2 ·H 2 O and dimethylglyoxime as reagents has been successfully developed for the controllable synthesis of Cu 2 O microcrystals with distinctive morphologies, including porous hollow microspheres, octahedral microcages, and microcrystals with truncated corners and edges and octahedral microcrystals. These structures can be fine-tuned by varying reaction temperature, reaction time, and concentration. The products were characterized by Xray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectra, and UV/Vis diffuse reflectance spectra. This is the first report of the preparation of the novel microcage structure of Cu 2 O through a simple solution-based route. By investigating the intermediate products which resemble the final crystal structures, a possible growth mecha-

Rhombic Dodecahedral Cu2O‐Catalysed Synthesis of Novel Alkenyl Pyrazoles

“…Meanwhile, a satellite peak was observed at 945 eV, which is due to the transition of the outer electron in Cu + . Furthermore, there is no obvious satellites on the higher binding‐energy side of the Cu 2p 3/2 peak, which further confirms the absence of CuO on the surface of the Cu 2 O crystals . Thus, the above results displayed that the obtained Cu 2 O microcrystals have no impurities, such as CuO.…”

One‐Step Hydrothermal Synthesis of a Porous Cu2O Film and Its Photoelectrochemical Properties

“…After increasing the reaction time to 6 h, microspheres that are exposed to the surface of the agglomerates are gradually dissolved (Figure 4 d). The microspheres gradually begin to dissolve from the center; this is because the smaller crystallites located at the central core have a higher surface energy and improved solubility, and, therefore, they tend to dissolve in the initial step 39. Finally, when the reaction time reaches 12 h, a porous structure is formed on the Cu substrate, as shown in Figure 1.…”

Plasmon-enhanced photocatalytic properties of nano Ag@AgBr on single-crystalline octahedral Cu2O (1 1 1) microcrystals composite photocatalyst

“…The high photocatalytic activity of Cu 2 O crystals bounded by (1 1 1) faces was ascribed to the surface copper atoms with dangling bonds, which interacted strongly with negatively charged MO molecules [14]. Zhang et al [16] reported that octahedral Cu 2 O microcrystals with entire (1 1 1) surfaces were more effective in photocatalytic decoloring Rhodamine B (RhB) aqueous solution than microcrystals of other shapes containing partial (1 0 0) and (1 1 0) recombination probability of photo-excited charge carriers and thus leads to the low photocatalytic activity [17].…”