Characterization of solid–solid interactions and physico-chemical properties of copper–cobalt mixed oxides and CuxCo3−xO4 spinels

Shaheen, W.M.; Ali, Amjad

doi:10.1016/s0025-5408(01)00655-9

Cited by 62 publications

(26 citation statements)

References 12 publications

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“…The increase of calcination temperature is typically accompanied by an increase in the degree of crystallinity of phases in copper cobalt oxides [16]. Nonetheless, the opposite result was observed by Shaheen [16], where the degree of crystallinity of detected phase in copper cobalt oxide decreased when synthesized by lower content of copper in Cu/Co ratio. Indeed, this discrepancy can be…”

Section: Introductionmentioning

confidence: 96%

“…To enable improved designs for optimal performance in these applications, their physicochemical, electrochemical, magnetic, conductivity as well as thermal properties have been intensely studied, in conjunction with their structural characteristics [6,8,[13][14][15][16]. From these previous studies, it can be construed that temperature change in the synthesis process or application has substantial influence on their physicochemical properties.…”

Section: Introductionmentioning

confidence: 99%

“…The spinel-type of copper cobalt oxides tends to form a low crystallized single phase of copper cobalt oxide with a partially inverted spinel structure and minor segregations of new cobalt and/or copper oxide phases, which depend on the Cu/Co ratio in the precursor salt as well as the calcination temperature [8,18]. The increase of calcination temperature is typically accompanied by an increase in the degree of crystallinity of phases in copper cobalt oxides [16]. Nonetheless, the opposite result was observed by Shaheen [16], where the degree of crystallinity of detected phase in copper cobalt oxide decreased when synthesized by lower content of copper in Cu/Co ratio.…”

Section: Introductionmentioning

confidence: 99%

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Tailoring the physicochemical and mechanical properties of optical copper–cobalt oxide thin films through annealing treatment

Amri

Jiang

Zhao

et al. 2014

Surface and Coatings Technology

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ÔØ Å ÒÙ× Ö ÔØTailoring the physicochemical and mechanical properties of optical copper cobalt oxide thin films through annealing treatment This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 Abstract Sol-gel dip-coated optical coatings, copper-cobalt oxides on aluminium substrates, were thermally treated at different annealing temperatures in the range 500 -650 °C. The resulting films were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis-NIR spectrophotometry and nanoindentation techniques. The crystallinity of CoCu 2 O 3 enhanced significantly, with increasing annealing temperature from 500 to 650 °C, while the electronic structure and bonding states of the copper-cobalt oxides matrix remained unchanged. UV-Vis-NIR analysis showed that the solar absorptance (α) of the coatings changed with increasing of annealing temperature and an optimum α (84.4%) was achieved at 550 °C, which also coincides to the maximum tensile residual stress of the coating.Nanoindentation tests exhibited an increasing trend in both the hardness (H) and elastic modulus (E) of the coatings with increase in annealing temperature, although a slight decrease in the H/E ratio was also observed. The experimental studies were complemented by Finite Element Modelling (FEM). The results showed that, under mechanical loading, the stress and plastic deformation were concentrated within the coating layers. As such, the likelihood of delamination of the coating layer upon unloading would be reduced.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tailoring the physicochemical and mechanical properties of optical copper–cobalt oxide thin films through annealing treatment

Amri

Jiang

Zhao

et al. 2014

Surface and Coatings Technology

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show abstract

“…Likewise, there have been numerous studies conducted to characterize the physicochemical, magnetic, conductivity, electrochemical and thermal properties of copper-cobalt oxides [1,[17][18][19][20] as well as nickel-cobalt oxides [7,21,22].…”

Section: Introductionmentioning

confidence: 99%

Optical and mechanical characterization of novel cobalt-based metal oxide thin films synthesized using sol–gel dip-coating method

Amri

Jiang

Pryor

et al. 2012

Surface and Coatings Technology

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ÔØ Å ÒÙ× Ö ÔØOptical and mechanical characterization of novel cobalt-based metal oxide thin films synthesized using sol-gel dip-coating method This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 AbstractNew cobalt-based metal oxide thin films (M x Co y O z with M = Mn, Cu, Ni) have been deposited on commercial aluminium and glass substrates using sol-gel dip-coating method.The as-deposited films were characterized by a wide range of complementary techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), Spectrophotometry and Nanoindentation techniques. A light absorption study for coatings on glass substrates within a wavelength range of 300-1100 nm was also conducted. Topographical and morphological investigations showed the presence of nano-sized, grain-like particles in the copper-cobalt oxide coatings, which consequently had the roughest surface among the three coatings. All coatings on glass substrate exhibited higher absorption of ultraviolet (UV) light compared to visible light, while coatings on aluminium substrate generally had low reflectance (< 50 %) of UV light, moderate reflectance (< 80 %) of visible light and high reflectance (up to 100 %) of infrared light. Implications of optical properties as a function of film thickness controlled by dip-heating cycles were discussed. The elastic modulus (E) and hardness (H) of thin film samples compared with standalone commercial aluminium substrate were also measured.

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“…The so-called mixed catalysts are often produced by thermal decomposition of mixed components of transition metals [3][4] . The thermal treatment of mixed solids may also lead to the formation of new compounds as a result of solid-solid interaction between the thermal products [5][6].…”

Section: Introductionmentioning

confidence: 99%

Characterization and catalytic properties of a series of CuO-MoO3 mixed oxides

Shaheen¹,

Selim²

2017

Egypt. J. Chem.

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A SERIES of single and mixed oxides of CuO-MoO 3 system were prepared by thermal treatment of pure and mixed basic copper carbonate and ammonium molybdate tetrahydrate solids. The thermal behavior of the pure and binary salts has been studied using thermal analysis (TG-DTA) technique. The thermal products were characterized using the X-ray diffraction analysis. The results revealed that, pure solids decomposed to CuO, MoO 3 and Cu 2 O phases at 250, 340 and 1000 o C respectively. Solid-solid interaction takes place between single oxides forming different phases of copper molybdate depending on treatment temperature and mixture composition. The degree of cystallinty of detected phases affected by calcination temperature solids and composition. The catalytic activity of single and binary oxides was tested in decomposition of hydrogen peroxide as a model reaction. The catalytic activity of mixed oxides was found to be higher than that of single oxides at different treatment temperature. The mechanism of decomposition reaction over the prepared oxides was discussed.

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Characterization of solid–solid interactions and physico-chemical properties of copper–cobalt mixed oxides and CuxCo3−xO4 spinels

Cited by 62 publications

References 12 publications

Tailoring the physicochemical and mechanical properties of optical copper–cobalt oxide thin films through annealing treatment

Tailoring the physicochemical and mechanical properties of optical copper–cobalt oxide thin films through annealing treatment

Optical and mechanical characterization of novel cobalt-based metal oxide thin films synthesized using sol–gel dip-coating method

Characterization and catalytic properties of a series of CuO-MoO3 mixed oxides

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