Synthesis of Cu xO(x = 1,2)/amorphous compounds by dealloying and spontaneous oxidation method

Wang, Zhifeng; Qin, Chunling; Liu, Li; Lijuan, Wang; Ding, Jian; Zhao, Weimin

doi:10.1590/s1516-14392013005000155

Cited by 8 publications

(8 citation statements)

References 15 publications

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“…This means that the ability to image and observe dissolution at the atomic scale also allows new insights that will increase our understanding of the dealloying process. Dealloying has been creatively harnessed in the fabrication of porous metals and recently extended to production of nanoporous32 or nanostructured metal oxides333435. For aluminum alloys, a number of studies rightly observed that the second phase materials in aluminum alloys dissolve selectively, with the active components dissolving preferentially to leave a Cu-rich remnant.…”

Section: Resultsmentioning

confidence: 99%

Direct observation of atomic-scale origins of local dissolution in Al-Cu-Mg alloys

Zhang

Wang

et al. 2016

Sci Rep

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Atomistic chemical inhomogeneities are anticipated to induce dissimilarities in surface potentials, which control corrosion initiation of alloys at the atomic scale. Precise understanding of corrosion is therefore hampered by lack of definite information describing how atomistic heterogeneities regulate the process. Here, using high-angle annular dark-field (HAADF) scanning transmission electron microscope (STEM) and electron energy loss spectroscopy (EELS) techniques, we systematically analyzed the Al20Cu2Mn3 second phase of 2024Al and successfully observed that atomic-scale segregation of Cu at defect sites induced preferential dissolution of the adjacent zones. We define an “atomic-scale galvanic cell”, composed of zones rich in Cu and its surrounding matrix. Our findings provide vital information linking atomic-scale microstructure and pitting mechanism, particularly for Al-Cu-Mg alloys. The resolution achieved also enables understanding of dealloying mechanisms and further streamlines our comprehension of the concept of general corrosion.

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Section: Resultsmentioning

confidence: 99%

Direct observation of atomic-scale origins of local dissolution in Al-Cu-Mg alloys

Zhang

Wang

et al. 2016

Sci Rep

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“…Cu 2+ is more stable than Cu + in an aqueous medium. Wang et al reported that Cu 2+ cations react with metallic Cu to form Cu + through a disproportionation reaction, with these unstable Cu + cations subsequently rapidly reacting with O-O(adsorb) to form Cu2O [18]. The sample surface shows the formation of a discontinuous oxide layer [6].…”

Section: Resultsmentioning

confidence: 99%

A Study on the Characteristics of Cu–Mn–Dy Alloy Resistive Thin Films

Lee

et al. 2019

Coatings

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Cu–Mn–Dy resistive thin films were prepared on glass and Al2O3 substrates, which wasachieved by co-sputtering the Cu–Mn alloy and dysprosium targets. The effects of the addition ofdysprosium on the electrical properties and microstructures of annealed Cu–Mn alloy films wereinvestigated. The composition, microstructural and phase evolution of Cu–Mn–Dy films werecharacterized using field emission scanning electron microscopy, transmission electronmicroscopy and X-ray diffraction. All Cu–Mn–Dy films showed an amorphous structure when theannealing temperature was set at 300 °C. After the annealing temperature was increased to 350 °C,the MnO and Cu phases had a significant presence in the Cu–Mn films. However, no MnO phaseswere observed in Cu–Mn–Dy films at 350 °C. Even Cu–Mn–Dy films annealed at 450 °C showedno MnO phases. This is because Dy addition can suppress MnO formation. Cu–Mn alloy filmswith 40% dysprosium addition that were annealed at 300 °C exhibited a higher resistivity of ∼2100 μΩ·cm with a temperature coefficient of resistance of –85 ppm/°C.

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“…In order to improve the volume fraction of Cu 2 O particles on glassy surfaces, Cu-based MG ribbons dealloying in HCl solutions with enhanced concentration were studied [ 34 ]. After Cu 52.5 Hf 40 Al 7.5 glassy ribbons were dealloyed in 0.1 M, 0.2 M and 0.4 M HCl solution for 8 h, Cu 2 O particles formed on MG surfaces exhibited a flower-like shape.…”

Section: Synthesis Of Cu 2 O Particles On Surfamentioning

confidence: 99%

“…As we know, the cost must be taken into account for practical commercial application of the dealloyed products. Recently, a new series of dealloyed products including nanoporous Cu (NPC) and nano/micro-Cu oxides with low cost and unique properties have been developed in our group [ 30 , 31 , 32 , 33 , 34 ]. This paper presents an overview of our recent advancement of dealloyed products via free-dealloying Cu-based metallic glasses (MGs) in hydrofluoric acid (HF) and hydrochloric acid (HCl) solutions, as well as a brief review of others’ results related to dealloying.…”

Section: Introductionmentioning

confidence: 99%

Dealloying of Cu-Based Metallic Glasses in Acidic Solutions: Products and Energy Storage Applications

et al. 2015

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Dealloying, a famous ancient etching technique, was used to produce nanoporous metals decades ago. With the development of dealloying techniques and theories, various interesting dealloying products including nanoporous metals/alloys, metal oxides and composites, which exhibit excellent catalytic, optical and sensing performance, have been developed in recent years. As a result, the research on dealloying products is of great importance for developing new materials with superior physical and chemical properties. In this paper, typical dealloying products from Cu-based metallic glasses after dealloying in hydrofluoric acid and hydrochloric acid solutions are summarized. Several potential application fields of these dealloying products are discussed. A promising application of nanoporous Cu (NPC) and NPC-contained composites related to the energy storage field is introduced. It is expected that more promising dealloying products could be developed for practical energy storage applications.

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Synthesis of Cu xO(x = 1,2)/amorphous compounds by dealloying and spontaneous oxidation method

Cited by 8 publications

References 15 publications

Direct observation of atomic-scale origins of local dissolution in Al-Cu-Mg alloys

Direct observation of atomic-scale origins of local dissolution in Al-Cu-Mg alloys

A Study on the Characteristics of Cu–Mn–Dy Alloy Resistive Thin Films

Dealloying of Cu-Based Metallic Glasses in Acidic Solutions: Products and Energy Storage Applications

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