814-91-5Relevant articles and documents
Ultrasound assisted quick synthesis of square-brick-like porous CuO and optical properties
Qiu, Mo,Zhu, Lianjie,Zhang, Tongtong,Li, Hongbin,Sun, Youguang,Liu, Kun
, p. 2437 - 2441 (2012)
Square-brick-like CuC2O4 intermediate was synthesized quickly by an ultrasound and microwave assisted solution route in the presence of sodium dodecyl benzene sulfonate (SDBS) surfactant using CuCl2 and K2C2O4 as raw materials. The CuC 2O4 was transformed into CuO with a preserved morphology by heating at 300°C for 2 h. The products were characterized by XRD, TG-DTA, XPS, SEM, TEM, HRTEM and N2 adsorption-desorption measurement. The light harvesting capability, photoluminescence and surface photovoltage properties of the CuO were investigated. The width and thickness of the obtained porous CuO square bricks are ca. 0.5-1 μm and 200 nm, respectively. Its average primary particle size is 12 nm. The formation mechanism of this square-brick-like CuO was investigated on the basis of series of controlling experiments. The results show that SDBS, C2O42- and ultrasonic processing play important roles in the formation of this square-brick-like morphology.
Preparation, characterization, and electrochemical application of mesoporous copper oxide
Cheng, Liang,Shao, Mingwang,Chen, Dayan,Zhang, Yuzhong
, p. 235 - 239 (2010)
Mesoporous CuO was successfully synthesized via thermal decomposition of CuC2O4 precursors. These products had ring-like morphology, which was made up of nanoparticles with the average diameter of 40 nm. The electrochemical experiments showed that the mesoporous CuO decreased the overvoltage of the electrode and increased electron transference in the measurement of dopamine.
Synthesis, crystal structure and magnetic properties of [Cr 2Cu2(bpy)4(OX)5]·2H 2O. An oxalato-bridged heterometallic tetramer
Coronado, Eugenio,Giménez, Mari Carmen,Gómez-García, Carlos J.,Romero, Francisco M.
, p. 3115 - 3122 (2003)
A new heterometallic tetramer of formula [Cr2Cu 2(bpy)4(ox)5]·2H2O (1) (bpy=2,2′-bipyridine; ox=oxalate dianion) has been prepared and characterised by single-crystal X-ray diffraction, magnetic susceptibility measurements and ESR spectroscopy. The tetranuclear unit in 1 can be viewed as the combination of two terminal [Cr(bpy)2(ox)]- units with a central oxalato-bridged copper(II) dimer. The chromium ions are in a distorted octahedral environment with metal-ligand distances ranging from 1.944(4) to 2.064(5) A?. The copper(II) centres lie in an axially distorted octahedron. The axial positions are occupied by one oxygen atom belonging to the central bridging oxalate anion [O(9)-Cu(1): 2.245(5) A?] and one oxygen atom coming from the [Cr(bpy)2(ox)]- moiety [O(7)-Cu(1): 2.357(5) A?]. The N2O2 equatorial environment is formed by a bpy ligand [Cu-N mean distance: 1.989(6) A?] and the remaining oxygen atoms [Cu-O mean distance: 2.162(5) A?]. The magnetic properties of 1 have been investigated in the 2-300 K temperature range. A ferromagnetic interaction between the copper(II) centres (J 1=+2 cm-1) is observed, whereas the interaction between the adjacent chromium(III) and copper(II) cations is weakly antiferromagnetic (J2=-0.65 cm-1).
Preparation, identification and thermal investigation of solid solutions of cobalt-copper oxalates
Donia, Ahmed M.,Dollimore, David
, p. 139 - 147 (1997)
The solid-solution oxalates of the series CoxCu1 -xC2O4.nH2O were prepared by coprecipitation from nitrate solutions. The characterization of the coprecipitates was carried out using X-ray powder diffraction (XRD), scanning electron microscopy and thermal analysis (TG/DTA) experiments in nitrogen. The results reveal the formation of a solid-solution with high cobalt content (x = 0.7) whereas other compositions with x = 0.3 or 0.5 did not form. The final solid products of the thermal treatment of the investigated oxalates are characterized by the formation of oxygen-deficient non-stoichiometric oxides. The thermal decomposition of the solid-solution and its mechanical mixture with the same mole ratio are very different. The first gave mixed lattice oxides in tri-and divalent states, whilst the latter gave separate oxides in the divalent state.
Preparation and characterization of CuO nanorods by thermal decomposition of CuC2O4 precursor
Xu, Congkang,Liu, Yingkai,Xu, Guoding,Wang, Guanghou
, p. 2365 - 2372 (2002)
Synthesis of copper oxide (CuO) nanorods was achieved by thermal decomposition of the precursor of CuC2O4 obtained via chemical reaction between Cu(CH3COO)2·H2O and H2C2O4·2H2O in the presence of surfactant nonyl phenyl ether (9)/(5) (NP-9/5) and NaCl flux. Transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), selected-area electron diffraction (SAED) and high-resolution TEM (HRTEM) were used to characterize the structure features and chemical compositions of the as-made nanorods. The results showed that the as-prepared nanorods is composed of CuO with diameter of 30-100 nm, and lengths ranging from 1 to 3 μ m. The mechanism of formation of CuO nanorods was also discussed.
Pillow-shaped porous CuO as anode material for lithium-ion batteries
Wan, Mei,Jin, Dalai,Feng, Ran,Si, Limin,Gao, Mingxia,Yue, Linhai
, p. 38 - 41 (2011)
Pillow-shaped porous cupric oxide (CuO) was prepared by a template-free method. Highly crystallized CuC2O4 precursor with micron-size in high dispersivity was prepared through a hydrothermal method first. Thermal treatment was carried out with the obtained precursor to produce porous cupric oxide. Thermogravimetry and differential thermal analysis (TG-DTA), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and galvanostatic cell cycling were employed to characterize the structure and electrochemical performance of the porous cupric oxide. The porous CuO powder exhibited high average coulombic efficiency (98.3%) and capacity retention (83.3% of the discharge capacity of the second cycle after 50 cycles) at a current rate of 0.1 C.
Synthesis and characterization of metallic copper nanoparticles via thermal decomposition
Salavati-Niasari, Masoud,Davar, Fatemeh,Mir, Noshin
, p. 3514 - 3518 (2008)
Copper oxalate was used as a precursor to prepare metallic copper nanoparticles by thermal decomposition. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and UV-Vis spectroscopy. XRD analysis revealed broad pattern for fcc crystal structure of copper metal. The particle size by use of Debye-Scherrer's equation was calculated to be about 40 nm.
Investigations of Cu/Zn Oxalates from Aqueous Solution: Single-Phase Precursors and Beyond
Zwiener, Leon,Girgsdies, Frank,Schl?gl, Robert,Frei, Elias
, p. 15080 - 15088 (2018)
The existence of a limited solid-solution series in the Cu/Zn binary metal oxalate system is reported. Coprecipitation was applied for the preparation of a comprehensive set of mixed Cu/Zn oxalates. Rietveld refinement of the XRD data revealed the formation of mixed-metal oxalate single phases at the compositional peripheries. Accordingly, the isomorphous substitution of ZnII into CuII oxalate takes place at Zn contents of ≤6.6 and ≥79.1 atom %. Zn incorporation leads to a pronounced unit-cell contraction accompanied by Vegard-type trends for the lattice parameters. Morphologically, both solid solutions show close resemblance to the corresponding pure single-metal oxalates, and thus distinct differences are identified (SEM). The successful formation of solid solutions was further evidenced by thermal analysis. The decomposition temperature of the oxalate was taken as an approximation for ZnII incorporation into the CuII oxalate structure. Single decomposition events are observed within the stated compositional boundaries and shift to higher temperature with increasing Zn content, whereas multiple events are present near Cu/Zn parity. Moreover, these findings are supported by IR and Raman spectroscopic investigations. This study on the Cu/Zn mixed-metal oxalate system sheds light on the important prerequisites for solid-solution formation and identifies the structural limitations that predefine its application as catalyst precursor.
Preparation, characterization and catalytic effects of copper oxalate nanocrystals
Singh, Gurdip,Kapoor, Inder Pal Singh,Dubey, Reena,Srivastava, Pratibha
, p. 499 - 505 (2012)
Recent work has described the preparation and characterization of copper oxalate nanocrystals (CONs). It was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and electron diffraction pattern (ED). The catalytic activity of CONs on the thermal decomposition of ammonium perchlorate (AP) and composite solid propellants (CSPs) has been done by thermogravimetry (TG), differential scanning calorimetry (DSC) and ignition delay measurements. Burning rate of CSPs was also found to be enhanced in presence of copper oxalate nanocrystals. Kinetics of thermal decomposition of AP with and without CONs has also been investigated. The model free (isoconversional) and model-fitting kinetic approaches have been applied to data for isothermal TG decomposition.
W-dimensional copper(II) complexes with the trinucleating ligand 2,4,6-Tris(di-2-pyridylamine)-1,3,5-triazine: Synthesis, crystal structures, and magnetic properties
Yuste, Consuelo,Canadillas-Delgado, Laura,Labrador, Ana,Delgado, Fernando S.,Ruiz-Perez, Catalina,Lloret, Francesc,Julve, Miguel
, p. 6630 - 6640 (2009)
The preparation and structural characterization of three new copper(II) complexes of formula [Cu3(dipyatriz)2(H20) 3] (CIO4)6·2H2O (1), {[Cu4(dipyatrlz)2(H
Lanthanum loaded CuO nanoparticles: synthesis and characterization of a recyclable catalyst for the synthesis of 1,4-disubstituted 1,2,3-triazoles and propargylamines
Sasikala,Rani, S. Kutti,Easwaramoorthy,Karthikeyan
, p. 56507 - 56517 (2015/07/15)
Lanthanum loaded CuO (LCO) nanoparticles (NPs) were successfully synthesized by a precipitation-thermal decomposition method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive spectra (EDS), diffuse reflectance spectra (DRS), photoluminescence (PL), X-ray photoelectron spectroscopy (XPS) and BET surface area measurements. The synthesized LCO NPs were used as a nanocatalyst for the synthesis of 1,4-disubstituted 1,2,3-triazoles by a click reaction of substituted benzyl azides and alkynes and the synthesis of propargylamines via three-component coupling reactions of aldehydes, alkynes and amines under ultrasonication. The one-pot operation, atom-economical nature, regioselectivity and good yields are the noteworthy features of this protocol. The reusability of the prepared nanocatalyst was successfully examined six times without any appreciable loss in catalytic activity.
