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Modulating conductivity type of cuprous oxide（Cu2O） films on copper foil in aqueous solution by comproportionation

Journal of Materials Science & Technology 2019年第8期35卷 1570-1577页

作者： Changwei Tang Xiaohui Ning Jian Li Hui-Lin Guo Ying Yang Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of EducationCollege of Chemistry & Materials ScienceNorthwest UniversityXi'an 710127 China National Demonstration Center for Experimental Chemistry Education Northwest UniversityXi'an 710127 China International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'an 710049 China

cuprous oxide(Cu2O)is an attractive material for photoelectrochemical(PEC)hydrogen production or photovoltaic application,because of its appropriate band gap,low material cost and *** this paper,Cu2O films were obtained by comproportionation in acid cupric sulfate solutions with varying concentrations of potassium *** and electrochemical experiments,such as zero-bias photocurrent responses,voltammograms,and Mott-Schottky measurements,show that the Cu2O films grown in low(≤0.75 mol dm^–3)and high(≥1.00 mol dm^–3)nitrate ion concentrations presented n-type and p-type conductivity,*** circuit potential and polarization behavior were monitored to investigate the mechanism of modulating conductivity *** ions consume protons in the plating solution during comproportionation with different concentrations of nitrate ions creating different pH at the Cu2O/solution *** gradient leads to the transformation of Cu2Ofilms conductivity changing from n-type to p-type with increasing the concentration of nitrate ions in the plating *** method could be used to fabricate homojunction electrode on metal substrate for PEC hydrogen production or photoelectric application.

关键词： cuprous oxide(Cu2O) Comproportionation Semiconductor films Tuning conductivity Photoelectrochemical cell

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Separation of methyl linolenate and its analogues by functional mixture of imidazolium based ionic liquid-organic solvent-cuprous salt

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Chinese Journal of Chemical Engineering 2019年第4期27卷 811-817页

作者： Xianghong Lu Jiajian Zhu Xing Qian Jianbing Ji Zhejiang Provincial Key Laboratory of Biofuel College of Chemical EngineeringZhejiang University of Technology

Methyl linolenate was separated from its analogues by a new extraction system constructed by solvent,imidazolium based ionic liquids and cuprous salt. Firstly, the effect of ionic liquid on the dissolution of CuCl in acetonitrile, N,N-dimethylformamide(DMF), methanol and water was evaluated by visual observation.[C4Mim][Cl]can improve the dissolution of CuCl in acetonitrile. Then, for the new system as acetonitrile-ILs-CuCl, extraction equilibrium, distribution ratio and selectivity of methyl linolenate and its analogues were determined by gas chromatography analysis and the mass balance. The extraction time, IL structures and CuCl concentrations were investigated. Distribution ratio decreased slightly, but selectivity increased significantly with the addition of CuCl,[C4Mim][Cl] or [C4Vim][NTF2] into acetonitrile.[C4Vim][NTF2] had higher selectivity than [C4Mim][Cl].But the selectivity of the system combining CuCl with [C4Vim][NTF2] was much lower than with [C4 Mim][Cl].For the CuCl-[C4Mim][Cl]-acetonitrile, the extraction efficiency was better than CuCl-acetonitrile, increasing Cu^+ concentration effectively improved the separation selectivity when ratio of CuCl/[C4Mim][Cl] was less than 1. Compared with previous aqueous AgNO3 extractions, the method of using CuCl is a much cheaper and practical way to enrich unsaturated fatty acid.

关键词： Methyl linolenate cuprous salt Ionic liquid Cosolvent Extraction

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Investigations of the interaction between cuprous oxide nanoparticles and Staphylococcus aureus

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Science China Chemistry 2009年第7期52卷 1028-1032页

作者： SHEN ChengLing LI YuanFang QI WenJing HUANG ChengZhi Key Laboratory on Luminescence and Real-Time Analysis of Ministry of Education College of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China College of Life Science Southwest UniversityChongqing 400715China College of Pharmaceutical Science Southwest UniversityChongqing 400715China

In this study, cuprous oxide nanoparticles of 30–50 nm in size were prepared in the presence of cetyltrimethylammonium bromide (CTAB). By taking Staphylococcus aureus (S.a), which always causes a variety of suppurative infections and toxinoses in humans, as a model bioparticle, the negative bioeffect of nano-Cu2O on S.a cells was evaluated, and minimal inhibitory concentration (MIC) was determined by imitating the MIC of antibiotics. Cellularity and bactericidal effect were measured by flow cytometry (FCM), dark field light scattering imaging and SEM photography. The results showed that nano-Cu2O particles may, by absorbing on the cell surface, impair the cell wall, damage the cell membrane, and finally increase permeability of the cell membrane, thus leading to a decrease in the viability of bacteria in the nano-Cu2O solution.

关键词： cuprous oxide nanoparticles Staphylococcus aureus minimal inhibitory concentration (MIC) flow cytometry (FCM)

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In Situ Synthesis of cuprous Oxide/Cellulose Nanofibers Gel and Antibacterial Properties

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Computers, Materials & Continua 2018年第9期56卷 517-527页

作者： Ying Hu Qinfei Ke Zhe Li Wanli Han Zhiyong Yan Engineering Research Center of Technical Textiles Donghua UniversityShanghai201620China Key Laboratory of Yarn Material Manufacturing and Processing of Zhejiang Province Jiaxing UniversityJiaxing314001China School of Materials Science and Engineering Georgia Institute of TechnologyAtlanta30318USA

Cellulose nanofibers were synthesized by acetobacter xylinum(xylinum 1.1812).The cellulose nanofibers with 30-90 nm width constructed three-dimension network gel,which could be used as a wound dressing since it can provide moist environment to a ***,cellulose nanofibers have no antimicrobial activity to prevent wound *** achieve antimicrobial activity,the cellulose nanofibers can load cuprous oxide(Cu2O)particles on the *** cuprous oxide is a kind of safe antibacterial *** copper ions can be reduced into cuprous oxides by reducing agents such as glucose,N2H4 and sodium *** cellulose nanofibers network gel was soaked in CuSO4 solution and filled with copper *** cuprous oxide nanoparticles were in situ synthesized by glucose and embedded in cellulose nanofibers *** morphologies and structure of the composite gel were analyzed by FESEM,FTIR,WAXRD and inductively coupled plasma(ICP).The sizes of Cu2O embedded in cellulose nanofibers network are 200-500 nm *** peak at 605 cm−1 attributed to Cu(I)-O vibration of Cu2O shits to 611 cm−1 in the Cu2O/cellulose *** Cu2O/cellulose nanofibers composite reveals the obvious characteristic XRD pattern of Cu2O and the results of ICP show that the content of Cu2O in the composite is 13.1%.The antibacterial tests prove that the Cu2O/cellulose nanofibers composite has the high antibacterial activities which is higher against *** than against ***.

关键词： Cellulose nanofiber cuprous oxide in situ synthesis antibacterial

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Tunable morphologies of polymer capsules templated from cuprous oxide particles for control over cell association

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Chinese Chemical Letters 2020年第2期31卷 505-508页

作者： Hongyan Pei Yanyan Bai Jianman Guo Zhiliang Gao Qiong Dai Qun Yu Jiwei Cui Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education School of Chemistry and Chemical EngineeringShandong UniversityJi'nan 250100China

Over the past two decades,layer-by-layer(LbL) assembly of micro/nanocapsules has been of interest for the investigation of bio-nano interactions to explore bio-applications,such as drug *** choice of an appropriate template that can be easily dissolved under mild conditions is one of the challenges for the assembly of LbL ***,we report the engineering of LbL capsules with tunable morphologies using cuprous oxide(Cu_2O) particles as ***_2O particles with cubic,tetradecahedral or spherical morphologies were synthesized via hydrothermal processes,which can be dissolved under mild condition(e.g.,sodium thiosulfate solution).The influence of capsule morphologies on cell association was investigated,which indicates that LbL capsules with cubic geometry promoted cell association up to 4 and 9-fold than tetradecahedral and spherical capsules,*** reported method provides a new avenue for the assembly of LbL capsules with different morphologies,which has the potential for better understanding of biological interactions of LbL capsules.

关键词： Layer-by-layer cuprous oxide Polymer capsules Cell association Polyphenol

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In situ Ionothermal Synthesisand Characterization of a Novel cuprous Halide Complex

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结构化学 2017年第4期 689-695页

作者： RONG Cheng LIN Jian-Di FANG Wei-Hui Department of Applied Chemistry，Fujian Agriculture and Forestry University，Fuzhou 350002，China State Key Laboratory of Structural Chemistry，Fujian Institute of Research on the Structure of Matter，Chinese Academy of Sciences，Fuzhou 350002，China

A new compound [mpba][Cu2Br3] (1,mpba =4-(N-methylpyridin-4-yl)benzoic acid) has been ionothermally synthesized and characterized by single-crystal X-ray diffraction analysis,infrared spectrum,elemental analyses,fluorescence spectrum,and thermogravimetric *** compound 1,the [upba]+ cation is a new organic template,which is obtained firstly in this work by in situ alkylation reaction of N-heterocycles 4-(pyridin-4-yl)benzoic acid with [Emim]Br (Emim =1-ethyl-3-methyl imidazolium).Hirshfeld surface analysis shows that weak interactions between the [mpba]+ cations and 1D inorganic [Cu2Br3]-are mainly C-H…Br hydrogen *** addition,a pairwise O-H…O interaction is observed between the adjacent [mpba]+ *** different types of weak interactions make compound 1 stable up to 300 ℃.Fluorescence spectrum investigation shows 1 has a strong yellow emission at 555 *** calculation not only demonstrates compound 1 is a wild band semiconductor with a 3.3 eV band gap but also elucidates the fluorescence emission derives from the π-π* transition of electrons from [Cu2Br3]-to [mpba].

关键词： alkylation cuprous halide ionothermal synthesis fluorescence

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Preparation of nanostructured Cu/Zr metal mixed oxides via self-sustained oxidation of a CuZr binary amorphous alloy

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Journal of Materials Science & Technology 2019年第8期35卷 1601-1606页

作者： Xingzhou Li Jili Wu Ye Pan School of Materials Science and Engineering Jiangsu Key Laboratory for Advance Metallic MaterialsSoutheast University

We propose and demonstrate for the first time an approach to synthesize nanostructured photocatalysts through combustion of metal alloys in amorphous state. This approach takes advantage of metastable state and composition homogeneity of amorphous alloys and produce photocatalysts with uniformly dispersed oxides at nanoscale by self-propagating reactions. Using CuZr amorphous ribbons as an example,we demonstrate a photocatalyst containing copper oxides and ZrO2 in the form of 10 nm-thick nanosheet with 2 nm nanopores. The new catalyst substantially outperforms those previously reported copper oxide catalysts in experiments of photocatalytic degradation of methylene blue and direct methanol fuel *** study opens up an avenue to fabricate nanostructured functional oxides in an environment friendly approach not only for photocatalyst but also for oxide based nanoelectronic and nanoionic applications.

关键词： Amorphous alloys cuprous oxide Degradation Oxidation

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Electrical conductivity of molten LiF–DyF3–Dy2O3–Cu2O system for Dy–Cu intermediate alloy production

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International Journal of Minerals,Metallurgy and Materials 2019年第6期26卷 701-709页

作者： Shu-mei Chen Chun-fa Liao Jue-yuan Lin Bo-qing Cai Xu Wang Yun-fen Jiao Institute of Metallurgy and Chemical Engineering Jiangxi University of Science and Technology

Dy–Cu intermediate alloys have shown substantial potential in the field of magnetostrictive and magnetic refrigerant ***,this study focused on investigating the electrical conductivity of molten-salt systems for the preparation of Dy–Cu alloys and on optimizing the corresponding operating *** electrical conductivity of molten LiF–DyF3–Dy2O3–Cu2O systems was measured from 910 to 1030°C using the continuously varying cell constant *** dependencies of the LiF–DyF3–Dy2O3–Cu2O system conductivity on the melt composition and temperature were examined *** optimal operating conditions for Dy–Cu alloy production were determined via analyses of the electrical conductivity and activation energies for conductance,which were calculated using the Arrhenius *** conductivity of the molten system regularly increases with increasing temperature and decreases with increasing concentration of Dy2O3 or Cu2O or *** activation energy Eκof the LiF–DyF3–Dy2O3 and LiF–DyF3–Cu2O molten-salt systems increases with increasing Dy2O3 or Cu2O *** regression functions of conductance as a function of temperature(t)and the addition of Dy2O3(W(Dy2O3))and Cu2O(W(Cu2O))can be expressed asκ=-2.08435+0.0068t-0.18929W(Dy2O3)-0.07918W(Cu2O).The optimal electrolysis conditions for preparing the Dy–Cu alloy in LiF–DyF3–Dy2O3–Cu2O molten salt are determined to be 2.0wt%≤W(Dy2O3)+W(Cu2O)≤3.0wt%and W(Dy2O3):W(Cu2O)=1:2 at 970 to 1000°C.

关键词： electrical conductivity molten salt Dy–Cu alloy dysprosium oxide cuprous oxide

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Emissive Mononuclear Cu（Ⅰ） Triphenylphosphine Complexes with Functionalized 6-tert-Butoxycarbonyl-2,2 ＇-bipyridine

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Chemical Research in Chinese Universities 2018年第1期34卷 19-23页

作者： LUO Yansheng ZENG Xuehua WANG Wanman CHEN Jinglin HE Lihua ZHANG Mengli LIU Suijun WEN Herui School of Metallurgy and Chemical Engineering Jiangxi University of Science and Technology Ganzhou 341000 P. R. China

Two new emissive mononuclear copper（Ⅰ） triphenylphosphine complexes with functionalized 6-tert- butoxycarbonyl-2,2＇-bipyridiue chelating ligands were prepared and characterized. Each Cu（Ⅰ） cation has a markedly distorted P2N2 tetrahedral array with two different Cu--N bond distances, due to the addition of the bulky tert-butoxycarbonyl group at the 6-position of the 2,2＇-bipyridyl ring. A weak low-energy broad absorption band appears at 330-500 nm in their CH2Cl2 solutions, which is influenced by the methylation of the 2,2＇-bipyridyl ring. At room temperature, the photoluminescence can be clearly observed both in degassed CH2Cl2 solution and in the solid state, because of the introduction of the bulky tert-butoxycarbonyl substituent, and the emission properties are remarkably affected by both the methylation and the alkoxycarbonyl variation of the 2,2＇-bipyridyl ring. It is shown that the introduction of the bulky tert-butoxyearbonyl group is favorable for improving the emission properties of the 6-alkoxycarbonyl-2,2＇-bipyridine-based cuprous complexes.

关键词： cuprous Methylation Alkoxyearbonyl Phosphine Lnminescence

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Cloride-derived copper electrode for efficient electrochemical reduction of CO_2 to ethylene

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Chinese Chemical Letters 2019年第2期30卷 314-318页

作者： Tian Qin Yao Qian Fan Zhang Bo-Lin Lin Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences School of Physical Science and Technology (SPST) ShanghaiTech University University of Chinese Academy of Sciences

The electrochemical reduction of carbon dioxide can convert the greenhouse gas into value-added chemical products or fuels, which provides a promising strategy to address current energy and environmental issues. Increasing the selectivity for C2&C2+ products, particularly ethylene, remains an important goal in this field. We chose cuprous chloride as the catalyst precursor for electrochemical reduction of CO_2, which efficiently converted carbon dioxide to ethylene. CuCl powder exhibited a maximum ethylene faradaic efficiency (FE) of 37%,ethylene partial current density of 14.8 mA/cm^2, and selectivity of 57.5% for C2&C2+ products at-1.06 V (vs. reversible hydrogen electrode, RHE). Electron microcopy (TEM, SEM) and time-resolved ex situ X-ray diffraction (XRD) demonstrated that the catalyst was transformed gradually into a mixed phase of copper and cuprous oxide, with the morphological change into a cubic structure during reduction process. The presence of Cu^(1+) and the unique electrode morphology may simultaneously lead to the enhanced electrochemical activity.

关键词： cuprous chloride Ethylene Electrochemistry Carbon dioxide reduction Morphology

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