Copper Oxide Nanocrystals.

Wu, C. S.; Lou, Yongbing; Burda, Clemens; Koberstein, Jeffrey T.; Zhu, Yimei; O’Brien, Stephen

doi:10.1002/chin.200541216

Cited by 77 publications

(107 citation statements)

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“…From a general point of view, it can be said that knowledge of the mechanisms responsible for the formation of Cu-Cu oxide Nps is far from complete and may vary with the different conditions under which they were fabricated. Yin et al 20 developed a copper (I) acetate high temperature thermal decomposition approach to form first Cu colloids that was gradually oxidized to form stable Cu 2 O particles of about 6 nm size, as supported by XRD studies. However, some of their optical absorption results show a resonance at about 610 nm which was tentatively assigned by the authors to possible Cu core-Cu 2 O shell Nps plasmon peak.…”

Section: Introductionmentioning

confidence: 99%

“…In this sense, optical extinction spectroscopy has demonstrated its ability to size core radius and shell thickness of noble metal Nps through the fitting of the full UV-Vis extinction spectra using Mie's theory 14 together with a conveniently modified metal bulk complex dielectric function that includes the size correction of free and bound electrons contributions. [15][16][17][18][19] During the last years, there has been a lot of research about Cu-Cu oxide nanocomposites [20][21][22][23][24][25][26][27][28] covering different aspects such as fabrication methods, optical properties, and structural analyses. From a general point of view, it can be said that knowledge of the mechanisms responsible for the formation of Cu-Cu oxide Nps is far from complete and may vary with the different conditions under which they were fabricated.…”

Section: Introductionmentioning

confidence: 99%

“…We discuss our results based on oxidation mechanisms of Nps during the fabrication process as studied by other authors. [20][21][22][23][24][25][26][27][28] …”

Section: Introductionmentioning

confidence: 99%

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Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Santillán

Videla

Raap

et al. 2013

Journal of Applied Physics

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We report on the analysis of structure, configuration, and sizing of Cu and Cu oxide nanoparticles (Nps) produced by femtosecond (fs) laser ablation of solid copper target in liquids. Laser pulse energy ranged between 500 lJ and 50 lJ. Water and acetone were used to produce the colloidal suspensions. The study was performed through optical extinction spectroscopy using Mie theory to fit the full experimental spectra, considering free and bound electrons size dependent contributions to the metal dielectric function. Raman spectroscopy and AFM technique were also used to characterize the sample. Considering the possible oxidation of copper during the fabrication process, two species (Cu and Cu 2 O) arranged in two structures (bare core or core-shell) and in two configuration types (Cu-Cu 2 O or Cu 2 O-Cu) were considered for the fitting depending on the laser pulse energy and the surrounding media. For water at high energy, it can be observed that a CuCu 2 O configuration fits the experimental spectra of the colloidal suspension, while for decreasing energy and below a certain threshold, a Cu 2 O-Cu configuration needs to be included for the optimum fit. Both species coexist for energies below 170 lJ for water. On the other hand, for acetone at high energy, optimum fit of the full spectrum suggests the presence a bimodal Cu-Cu 2 O core-shell Nps distribution while for decreasing energy and below a 70 lJ threshold energy value, Cu 2 O-Cu core-shell Nps must be included, together with the former configuration, for the fit of the full spectrum. We discuss possible reasons for the changes in the structural configuration of the core-shell Nps. V C 2013 American Institute of Physics. [http://dx

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Santillán

Videla

Raap

et al. 2013

Journal of Applied Physics

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“…2 was only present on the surface of Cu-Mn/OMC, which formed a thin amorphous outer shell (Yin et al, 2005), and Cu 2+ in precursors might also be reduced to Cu 0 and Cu + during the carbonization process . In addition, the diffraction peaks of Cu-Mn/OMC(S) corresponding to Cu and Cu 2 O were weaker than that in other samples, which could be attributed to the better dispersion of Cu phases (Sultana et al, 2012).…”

Section: Xrdmentioning

confidence: 99%

Selective Catalytic Reduction of NO over Cu-Mn/OMC Catalysts: Effect of Preparation Method

Cao

Zhu

et al. 2017

Aerosol Air Qual. Res.

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Ordered mesoporous carbon (OMC) was used as support for CuO x and MnO x , and the effects of preparation method on selective catalytic reduction (SCR) of NO with NH 3 were investigated. The Cu-Mn/OMC prepared by solvent evaporation-induced self-assembly method, named as self-assembly synthesis (S), exhibited higher NO conversion and N 2 selectivity than the catalyst prepared by ultrasound-assisted impregnation (I) or mechanical mixing (M). The structural and surface properties of catalysts were characterized by various techniques. XRD and TEM results showed good dispersion of active phases on Cu-Mn/OMC(S). XPS analysis suggested that the surface of Cu-Mn/OMC(S) had the maximum amount of O-C=O groups and chemisorbed O. The strongest acidity and largest amount of oxidative species were further illustrated by NH 3 -TPD and H 2 -TPR profiles, which were consistent with the XPS results. Accordingly, these favorable properties may be the main reasons for the outstanding performance of Cu-Mn/OMC(S) in NH 3 -SCR reaction. Thus, selfassembly synthesis can be considered an effective method for the preparation of OMC-supported catalysts.

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“…These nanoparticles are also utilized in a wide range of applications such nano devices such as degradation, bactericidal properties, etc. [22][23][24]. Herein, we will report the combination of Ag-clinoptilolite zeolite as host and CuO nanoparticles as guest materials to synthesize CuO NPs/ Ag-clinoptilolite zeolite composite an adsorbent catalyst in which the high surface area of nanoparticles and the absorbent capacity provided by the zeolite cooperation to increase the efficiency of the removal process of radioactive 90 Sr from water sample of Bushehr city.…”

Section: Introductionmentioning

confidence: 99%

Effective removal of radioactive 90Sr by CuO NPs/Ag-clinoptilolite zeolite composite adsorbent from water sample: isotherm, kinetic and thermodynamic reactions study

et al. 2016

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In this research, the natural zeolite named clinoptilolite (NCp) was considered as an applicable base structure for subsequent preparation and modification by pre-selected chemical agents to use for removal/adsorption goals in progress. To make Na-clinoptilolite form, the mentioned zeolite undergoes variations by treating with NaCl salt. Ion exchange procedure was utilized to imprint silver ions (Ag ? ) from silver (I) nitrate solution as silver precursor on the modified clinoptilolite zeolite structure to attain Ag-clinoptilolite zeolite. Tenorite (CuO) NPs have been then dispersed and deposited on the external surface of the pre-prepared Ag-clinoptilolite zeolite through impregnation method to prepare the CuO NPs/Ag-clinoptilolite zeolite as a novel composite adsorbent. A series of analyses techniques including SEM-EDAX, XRD and FT-IR were applied for characterization and identification of crystal structure, morphology and elemental composition of the synthesized samples. The removal and adsorption process of radioactive strontium-90 ( 90 Sr) by CuO NPs/Agclinoptilolite zeolite composite adsorbent was exploited under various experimental conditions including pH, amount of adsorbent and the contact time at room temperature and the final optimized procedure used for removal of probable presence of 90 Sr in water sample of Bushehr city. Adsorption isotherm models including Langmuir, Freundlich, Temkin, D-R, H-J and Hasley have been applied and equilibrium adsorption data was better fitted to the Freundlich, Temkin, H-J and Halsey isotherms. The reaction kinetic information was studied by utilizing pseudo first and second orders, Elovich and Intra particle diffusion kinetic models. The adsorption kinetics is finely described by the pseudo second-order model. The energy of activation E a calculated using the Arrhenius equation was found to be 44.75 kJ/mol. Further, the evaluation of the thermodynamic parameters such as DG 0 , DH 0 and DS 0 , denoted that adsorption process of 90 Sr was spontaneous and illustrates a chemical adsorption properties and exothermic nature of the adsorption. The obtained results revealed that 90 Sr ions were removed by CuO NPs/Agclinoptilolite zeolite composite under optimized conditions after 6 h with a yield more than 97 %.

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Copper Oxide Nanocrystals.

Cited by 77 publications

References 1 publication

Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Selective Catalytic Reduction of NO over Cu-Mn/OMC Catalysts: Effect of Preparation Method

Effective removal of radioactive 90Sr by CuO NPs/Ag-clinoptilolite zeolite composite adsorbent from water sample: isotherm, kinetic and thermodynamic reactions study

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