Different copper oxide nanostructures: Synthesis, characterization, and application for C‐N cross‐coupling catalysis

Abstract

Cupric oxide and cuprous oxide micro‐/nanomaterials with well‐controlled sizes and morphologies have been synthesized via different crystal growth techniques. Structural and morphological characterizations of these copper oxide micro‐/nanomaterials were performed by X‐ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). After that, these copper oxide micro‐/nanomaterials were used as catalysts for a typical C‐N cross‐coupling reaction directly. The catalytic results showed that different copper oxide micro‐/nanomaterials had different catalytic activities in C‐N cross‐coupling reaction. The particle size of cupric oxide and the oxidation state of copper played vital roles in the catalytic process. Cupric oxide with small particle size has the best catalytic activity, while cupric oxide with different morphologies has almost the same yields and cuprous oxide has very poor yields. Further, the possible catalytic mechanism for copper oxide nanomaterials catalyzed cross‐coupling reaction was proposed. And the influence of particle size and oxidation state was carefully discussed. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Robust Superamphiphobic Nanoscale Copper Sheet Surfaces Produced by a Simple and Environmentally Friendly Technique

“…During this morphological transition, the color of the Cu sheet treated in hot de‐ionized water changed from reddish for 4 and 8 h treatment toward a dark‐iron color after 12 and 16 h of treatment . Both cubic‐like nanostructures and leaf‐like nanostructures have been previously reported as forms of Cu‐based oxide materials …”

Green synthesis of CuO nanoparticles using Lantana camara flower extract and their potential catalytic activity towards the aza-Michael reaction

“…Because of these distinctive properties, Cu based nanomaterials are widely used as catalysts in various organic transformations including electrocatalysis, and photo catalysis. [9][10][11][12][13][14] However, it is challenging to develop a synthesis method for Cu based nanocatalysts that are highly active, selective, stable, and robust. 15 Among various Cu based materials, copper oxide (CuO) is one of the simplest and industrially important semiconductor materials belonging to the monoclinic structure system with a narrow bandgap energy of 1.2 eV.…”

MOF-Derived Cu@Cu2O Nanocatalyst for Oxygen Reduction Reaction and Cycloaddition Reaction

“…This ratio was found to be an important factor affecting the catalytic activity [ 19 , 20 ]. Such copper-copper oxide (Cu-CuO, Cu-Cu 2 O, Cu 2 O-CuO) core-shell nanoparticles are widely used as catalysts for several organic transformations, including cross-coupling reactions, cycloaddition reactions, catechol oxidation reactions, styrene oxidation reactions, CO oxidation, photocatalytic degradation and reductive degradation [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. In addition, when combined with other metal species or supports, copper/copper oxide hybrid nanoparticles not only exhibit better catalytic activity, but also present superior stability and physicochemical properties.…”