Oxidation of copper nanopowders on heating in air

Korshunov, A. V.; Il’in, A. P.

doi:10.1134/s1070427209070039

Cited by 17 publications

(8 citation statements)

References 6 publications

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“…During the thermal oxidation process, Cu 2 O is first formed, and after a sufficiently long oxidation time, CuO is formed (Musa et al, 1998;Cocke et al, 2005;Korshunov, and Il'in, 2009). Thus, the reactions occurring during the thermal oxidation process can be written as follows:…”

Section: Introductionmentioning

confidence: 99%

Leaching of Malachite Ore in Ammonium Sulfate Solutions and Production of Copper Oxide

Ekmekyapar

Demirkıran

Künkül

et al. 2015

Braz. J. Chem. Eng.

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-Malachite ore is one of the most important of oxidized copper ores. Copper production can be performed by using this ore. In this work, the leaching kinetics of malachite in ammonium sulfate solutions was investigated, and metallic copper was recovered by a cementation method from the resulting actual leach solution. Copper (II) oxide was prepared by an isothermal oxidation method from the cement copper. In the leaching experiments, the effects of reaction temperature, particle size, and stirring speed on copper leaching from malachite ore were studied. In the cementation experiments, metallic zinc was used as the reductant metal to recover the copper from the solution. Thermal oxidation of cement copper was performed under isothermal conditions. It was found that the leaching rate increased with increasing stirring speed and temperature, and decreased with particle size. It was observed that the leaching reaction fit to diffusion through the product layer. The activation energy of the leaching process was determined to be 25.4 kJ/mol. It was determined that the copper content of the metallic product obtained by the cementation method increased up to 96%. It was found that copper oxide prepared from cement copper had a tenorite structure.

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Section: Introductionmentioning

confidence: 99%

Leaching of Malachite Ore in Ammonium Sulfate Solutions and Production of Copper Oxide

Ekmekyapar

Demirkıran

Künkül

et al. 2015

Braz. J. Chem. Eng.

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“…Cu + is a highly active ion that is easily oxidized (Yang et al, 2006). The progression of the Cu 2 O oxidation reaction is preceded by the appearance of CuO on the periphery of the former layer (Gonçalves et al, 2009; Korshunov & Il’in, 2009). The hollow structure of CuO nanospheres is speculated to be originated through the Kirkendall effect (Cho & Huh, 2009).…”

Section: Resultsmentioning

confidence: 99%

Room Temperature Synthesis of Cu₂O Nanospheres: Optical Properties and Thermal Behavior

et al. 2014

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The present work reports a simple and easy wet chemistry synthesis of cuprous oxide (Cu2O) nanospheres at room temperature without surfactants and using different precursors. Structural characterization was carried out by X-ray diffraction, transmission electron microscopy, and scanning electron microscopy coupled with focused ion beam and energy-dispersive X-ray spectroscopy. The optical band gaps were determined from diffuse reflectance spectroscopy. The photoluminescence behavior of the as-synthesized nanospheres showed significant differences depending on the precursors used. The Cu2O nanospheres were constituted by aggregates of nanocrystals, in which an on/off emission behavior of each individual nanocrystal was identified during transmission electron microscopy observations. The thermal behavior of the Cu2O nanospheres was investigated with in situ X-ray diffraction and differential scanning calorimetry experiments. Remarkable structural differences were observed for the nanospheres annealed in air, which turned into hollow spherical structures surrounded by outsized nanocrystals.

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“…Cu → Cu + Cu2O → Cu2O → Cu2O + CuO → CuO. Cu2O oxidation occurs at temperatures as low as 100 °C [372]. In contrary, CuO formation is slow and is considered a product of Cu2O oxidation (CuO starts at 300 ºC [373]).…”

Section: Tungsten Trioxidementioning

confidence: 99%

“…In contrary, CuO formation is slow and is considered a product of Cu2O oxidation (CuO starts at 300 ºC [373]). Its formation is possible above a certain critical thickness of a Cu2O layer on the metal surface, thus Cu2O serves as precursor to CuO [372]. The reactions involved can be summarized as follows [366]:…”

Section: Tungsten Trioxidementioning

confidence: 99%

“…The thermal oxidation of metallic copper into both Cu 2 O and CuO has been largely reported [11,348,[364][365][366][367][368][369][370], as copper displays high oxygen affinity [371]. The oxide phase formation starting from copper by thermal oxidation can be described as follows: Cu→Cu+Cu 2 O→Cu 2 O→ Cu 2 O+CuO→CuO.…”

Section: Copper Oxidesmentioning

confidence: 99%

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Metal oxide nanostructures for sensor applications

Nunes

Pimentel

Gonçalves

et al. 2019

Semicond. Sci. Technol.

245

119

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Human health, environmental protection and safety are just a few examples of current humankind main concerns, that drive the scientific community to develop sensors able to precisely monitor and alert to possible harms in real time. Over the years, semiconductor metal oxide-based materials have been largely employed as sensors dedicated to several applications, being particularly interesting at the nanometer scale, since it is largely known that smaller crystallite size enhances sensor's performance. Moreover, these materials are highly appealing as they can be produced by low-cost wet-chemical synthesis routes and are in general nontoxic, earth abundant and low-cost. This manuscript extensively reviews the recent developments of nanostructured semiconductor metal oxide sensors ranging from gas to humidity sensors, including ultraviolet (UV) sensors and biosensors. Zinc oxide (ZnO), titanium dioxide (TiO2), tungsten trioxide (WO3), copper oxide (CuO and Cu2O), tin oxide (SnO and SnO2), and vanadium oxide (VO2, V2O5)-based sensors either as nanoparticles or as continuous films/layers are described. Their sensing properties are correlated to size, shape, presence of defects, doping elements, amongst other relevant parameters. Different techniques and methods of fabricating these materials are addressed. The review is concluded with novel approaches for functionalization and future perspectives for sensor developments.

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Oxidation of copper nanopowders on heating in air

Cited by 17 publications

References 6 publications

Leaching of Malachite Ore in Ammonium Sulfate Solutions and Production of Copper Oxide

Leaching of Malachite Ore in Ammonium Sulfate Solutions and Production of Copper Oxide

Room Temperature Synthesis of Cu₂O Nanospheres: Optical Properties and Thermal Behavior

Metal oxide nanostructures for sensor applications

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Oxidation of copper nanopowders on heating in air

Cited by 17 publications

References 6 publications

Leaching of Malachite Ore in Ammonium Sulfate Solutions and Production of Copper Oxide

Leaching of Malachite Ore in Ammonium Sulfate Solutions and Production of Copper Oxide

Room Temperature Synthesis of Cu2O Nanospheres: Optical Properties and Thermal Behavior

Metal oxide nanostructures for sensor applications

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Room Temperature Synthesis of Cu₂O Nanospheres: Optical Properties and Thermal Behavior