Xn:Harmful;20427-59-2Relevant articles and documents
Infrared spectra and structures of the coinage metal dihydroxide molecules
Wang, Xuefeng,Andrews, Lester
, p. 9076 - 9083 (2005)
Laser-ablated Cu, Ag, and Au atoms react with H2O2 and with H2 + O2 molecules during condensation in excess argon to give four new IR absorptions in each system (O-H stretch, M-O-H bend, O-M-O stretch, and M-O-H
In situ X-ray photoelectron spectroscopy study of the oxidation of CuGaSe2
Würz,Rusu,Schedel-Niedrig,Lux-Steiner,Bluhm,H?vecker,Kleimenov,Knop-Gericke,Schl?gl
, p. 80 - 94 (2005)
The thermal and native oxidation of CuGaSe2 thin films was studied by in situ X-ray photoelectron spectroscopy (XPS). The special design of the XPS chamber allowed to measure XP-spectra under oxidizing gas atmospheres at pressures of up to 5 mb
One-step bulk synthesis of stable, near unit-cell sized oxide nanoparticles and nanoparticle blends using KO2
Sutto, Thomas E.
, p. 4570 - 4578 (2014)
Presented here is a novel one-step synthesis of oxide or hydroxide nanoparticles using, for the first time, potassium superoxide (KO2). This work demonstrates that the reaction of KO2 with different salt solutions produces grams of stable, near unit-cell sized nanoparticles. This new synthetic technique is applied to representative elements from across the periodic table to rapidly produce nanometer sized oxides or hydroxides of Mg, Al, Y, Ti, Mn, Fe, Co, Ni, Cu, Zn, Sn, Tl, Pb, and Ce. This technique is also used to produce blends of nanoparticles, demonstrating the ability to prepare complex materials such as nanoparticulate blends of a lithium cathode material (LiCoO2), the multiferroic compound (BiMnO3+δ), and the superconducting YBa2Cu3O7-γ. This article not subject to U.S. Copyright. Published 2014 by the American Chemical Society.
A surfactant free synthesis and formation mechanism of hollow Cu2O nanocubes using Cl- ions as the morphology regulator
Wang, Qiuxiang,Kuang, Qin,Wang, Kunshui,Wang, Xue,Xie, Zhaoxiong
, p. 61421 - 61425 (2015)
Hollow nanomaterials have attracted intense attention due to their special structures and potential applications in many fields. In this paper, we report a surfactant free synthesis of hollow Cu2O nanocubes by reducing Cu2+ precursors using Cl- ions as the morphology regulator at room temperature. It is found that in the presence of Cl- ions, hollow Cu2O nanocubes can be easily synthesized by directly reducing Cu2+ precursors with ascorbic acid. Through well-designed experiments, we propose that, in this surfactant free synthetic route, the formation of hollow Cu2O nanocubes results from a reaction activated Kirkendall diffusion process of cubic CuCl intermediates, which are formed in the reaction process and act as self-sacrificial templates. The amounts of Cl- ions and NaOH are two key factors to determine whether hollow Cu2O nanocubes are formed or not.
Non-enzymatic electrochemical glucose sensing by Cu2O octahedrons: elucidating the protein adsorption signature
Rakshit, Soumyadipta,Ghosh, Srabanti,Roy, Rimi,Bhattacharya, Subhash Chandra
, p. 628 - 637 (2021)
A facile solution based chemical route has been developed for the synthesis of cuprous oxide (Cu2O) octahedrons employing polyvinylpyrrolidone (PVP ～ 10k) at a relatively low temperature (50 °C) in aqueous medium and their response towards electrochemical non-enzymatic glucose sensing has been precisely investigated. The amperometric analysis reveals two calibration ranges (0.1 μM-1 mM and 1-7 mM) for the modified electrodes, with an excellent glucose specific selectivity over other interfering materials like sucrose, fructose, ascorbic acid (AA) and dopamine (DA). Careful analysis of the amperometric outcomes unveils a low limit of detection (LOD) of 0.96 μM (S/N = 3) along with exceptionally good stability and repeatability. Furthermore, the octahedral Cu2O modified electrodes exhibit a fast response time (～1.5 s) with acceptable sensitivity and are found to be exceedingly reliable for the real time analysis of human serum samples (relative error 3.2%) compared to commercial glucose biosensors. Detailed survey of the adsorption of four most common blood proteins onto the negatively charged surface of Cu2O octahedrons using steady state fluorescence, dynamic light scattering (DLS), zeta potential (ζ) and circular dichroism (CD) in aqueous dispersions delineates the electrostatic interaction driven low protein adsorption that strongly indicates their further potential applicability in medical devices for targeted monitoring of glucose. This journal is
CuO nanomaterials for p-type dye-sensitized solar cells
Jiang, Tengfei,Bujoli-Doeuff, Martine,Farré, Yoann,Pellegrin, Yann,Gautron, Eric,Boujtita, Mohammed,Cario, Laurent,Jobic, Stéphane,Odobel, Fabrice
, p. 112765 - 112770 (2016)
In p-type dye-sensitized solar cells (p-DSSCs), NiO is the most commonly used p-type semiconductor. Nevertheless, because of the drawbacks of NiO, much effort has been made to search for suitable substitutes. Herein, three different morphologies of CuO nanomaterials were used to prepare photocathodes for p-DSSCs, which have a deeper valence band and a higher dielectric constant compared to that of NiO. We observe that CuO is unstable in the presence of iodide/triiodide electrolyte, while cobalt complexes with bipyridine ligands are more suitable redox shuttles. We also note that the average transport time in CuO is shorter than that in NiO. Finally, the deep absorbance of CuO in the visible range indicates that suitable sensitizers for the CuO p-DSSC must exhibit high extinction coefficient and absorption bands located in the lower energy part of the solar spectrum (>600 nm) to be exploitable. In this case such CuO based photocathodes represent valuable systems to exploit the near-infrared (NIR) region.
Nonenzymatic hydrogen peroxide biosensor based on four different morphologies of cuprous oxide nanocrystals
Zhong, Yanmei,Li, Yancai,Li, Shunxing,Feng, Shuqing,Zhang, Yayun
, p. 40638 - 40642 (2014)
In this work, we synthesized four different morphologies of cuprous oxide (Cu2O) nanocrystals (cube, rhombic dodecahedra, octahedra, and extended hexapod) by a hydrothermal method. Then, the four different morphologies of Cu2O were immobilized separately on a glassy carbon electrode (GCE) to construct a non-enzymatic hydrogen peroxide (H2O2) biosensor. We systematically explored the electrocatalytic activities of the four different Cu2O nanocrystals towards H2O2, which are strongly dependent on the shape of the Cu2O nanocrystals. It is shown that the modified electrodes exhibited excellent electrocatalysis for H2O2reduction by electrochemical experiments. Moreover, the {111}-bounded extended hexapod Cu2O, {111}-bounded octahedral Cu2O and the {110}-bounded rhombic dodecahedral Cu2O nanocrystals are significantly more active than the {100}-bounded cubic Cu2O nanocrystals, as the {111} and {110} face contain copper atoms on the surface with dangling bonds, and are expected to interact more strongly with negatively charged ions or molecules. This journal is
Sebacato-bridged Cu(II) phen complexes: Syntheses and crystal structures of 2∞[Cu2(phen)2L4/2] (H2O)6 and [(phen)2Cu(μ-L)Cu(phen)2](HL)2 (H2L)(H2O)4 (H2L = sebacic acid; phen = 1,10-phenanthroline)
Wei, Dan-Yi,Kong, Zu-Ping,Zheng, Yue-Qing
, p. 1621 - 1628 (2002)
Reactions of freshly-prepared Cu(OH)2 with sebacic acid (H2L) and 1,10-phenanthroline (phen) in EtOH/H2O (1:1 v/v) and CH3OH/H2O (1:1 v/v) and at pH 6.4 afforded two novel sebacato-bridged Cu(II) phen complexes 2∞[Cu2(phen)2L4/2] (H2O)6 (1) and [(phen)2Cu(μ-L)Cu(phen)2](HL)2 (H2L)(H2O)4 (2), respectively, Complex 1 consists of 2D 2∞[Cu2(phen)2L4/2] layers and lattice H2O molecules. The Cu atoms are each square-pyramidally coordinated by two N atoms of one phen ligand and three O atoms of different sebacato ligands. Two adjacent square pyramids are edge-shared to form [Cu2N4O4] dimers, which are interlinked by sebacato ligands to 2D 2∞[Cu2(phen)2L4/2] layers with rhombus-like 52-membered rings. The resulting layers are assembled by interlayer π-π stacking interactions and hydrogen bonding interactions. Complex 2 comprises divalent [(phen)2Cu(μ-L)Cu(phen)2] complex cations, hydrogensebacate anions, sebacic acid molecules and lattice H2O molecules. In the divalent complex cations, the Cu atoms are each octahedrally coordinated by four N atoms of two phen ligands and two O atoms of one bis-chelating sebacato ligand. The complex cations are assembled via π-π stacking interactions into positively charged 2D network. The hydrogensebacate anions, sebacic acid molecules and H2O molecules build negatively charged 2D hydrogen-bonded networks. Both positively and negatively charged 2D networks are interwoven with each other to generate a novel supramolecular architecture.
Copper-Catalysed Oxidation of Cyanide by Peroxide in Alkaline Aqueous Solution
Beattie, James K.,Polyblank, Gregory A.
, p. 861 - 868 (1995)
The oxidation of cyanide by peroxide in alkaline aqueous solution is catalysed by copper complexes.In the presence of excess cyanide, copper(II) is reduced to form the tricyanocuprate(I) complex.The cyanogen oxidation product is hydrolysed with disproportionation to cyanate and cyanide: 2CuII + 2CN(-) --> 2CuI + (CN)2; (CN)2 + 2OH(-) --> OCN(-) + CN(-) + H2O; CuI + 3CN(-) Cu(CN)3(2-).The stoichiometry and kinetics of the catalysed oxidation have been investigated.Hydrogen peroxide oxidizes coordinated cyanide with a rate that is first order in peroxide and first order in copper but independent of cyanide concentration in the presence of excess cyanide.Cu(CN)3(2-) + H2O2 --> Cu(CN)2(-) + OCN(-) + H2O; Cu(CN)2(-) + CN(-) Cu(CN)3(2-).When the excess cyanide is consumed and Cu(CN)2(-) becomes the dominant species, the reaction becomes more complex and less efficient.Under certain conditions the stoichiometry revealed a peroxide-to-Cu(CN)2(-) ratio of about 6:1, instead of the minimum of 2.5:1 required for the oxidation of the coordinated cyanide to cyanate and the CuI to Cu(OH)2.This suggests that peroxide is consumed by a copper-catalysed disproportionation, in competition with oxidation of the coordinated cyanide.An intermediate yellow complex forms while peroxide is present, before Cu(OH)2 finally precipitates.The consequence of this mechanism is that the most efficient process for the destructive oxidation of cyanide has a high cyanide-to-copper ratio, to minimize the final concentration of Cu(CN)2(-) which consumes peroxide inefficiently.The rate of the reaction depends on the concentration of copper, however, which must be large enough for a satisfactory turnover.
One-step template-free solution route for Cu(OH)2 nanowires
Sun, Jinhe,Jia, Yongzhong,Jing, Yan,Yao, Ying,Li, Wu
, p. 36 - 39 (2008)
Cu(OH)2 nanowires with a diameter of 8-10 nm and lengths of tens of micrometers were fabricated in the basic solution by dropping simply NaOH solution into CuCl2 solution at ambient temperature. The formation mechanism of nanowires was discussed. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) were used to characterize the samples.
