Step-Edge-Induced Oxide Growth During the Oxidation of Cu Surfaces

Zhou, Guangwen; Luo, Langli; Li, Liang; Ciston, Jim; Stach, Eric A.; Yang, Judith C.

doi:10.1103/physrevlett.109.235502

Cited by 121 publications

(107 citation statements)

References 37 publications

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“…At the faceted interface, there are atomic ledges and the oxidation happens through the sweeping of atomic ledges along the interface. Similar oxidation mechanism has been also observed for the case of oxidation of Cu22. The oxidation was initiated by multi-site nucleation of oxides on the metal nanoparticle surface (Figure 3(c)).…”

Section: Resultssupporting

confidence: 76%

In-Situ TEM visualization of vacancy injection and chemical partition during oxidation of Ni-Cr nanoparticles

Wang

Genç²,

Cheng³

et al. 2014

Sci Rep

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Oxidation of alloy often involves chemical partition and injection of vacancies. Chemical partition is the consequence of selective oxidation, while injection of vacancies is associated with the differences of diffusivity of cations and anions. It is far from clear as how the injected vacancies behave during oxidation of metal. Using in-situ transmission electron microscopy, we captured unprecedented details on the collective behavior of injected vacancies during oxidation of metal, featuring an initial multi-site oxide nucleation, vacancy supersaturation, nucleation of a single cavity, sinking of vacancies into the cavity and accelerated oxidation of the particle. High sensitive energy dispersive x-ray spectroscopy mapping reveals that Cr is preferentially oxidized even at the initial oxidation, leading to a structure that Cr oxide is sandwiched near the inner wall of the hollow particle. The work provides a general guidance on tailoring of nanostructured materials involving multi-ion exchange such as core-shell structured composite nanoparticles.

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Section: Resultssupporting

confidence: 76%

In-Situ TEM visualization of vacancy injection and chemical partition during oxidation of Ni-Cr nanoparticles

Wang

Genç²,

Cheng³

et al. 2014

Sci Rep

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“…The minimum energy path for oxygen atoms hopping between fcc hollow sites is along the h110i directions with an energy barrier of $0.71-0.75 eV. 32,33 Due to the low Pt concentration in the Cu-5 at. %Pt(100) thin film, the favorable diffusion path of oxygen atoms is along the h110i directions, which therefore facilitates the elongation of the oxide islands along these directions.…”

Section: Resultsmentioning

confidence: 99%

Nucleation and growth of oxide islands during the initial-stage oxidation of (100)Cu-Pt alloys

Luo

Kang

Yang

et al. 2015

Journal of Applied Physics

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Effect of gold composition on the orientations of oxide nuclei during the early stage oxidation of Cu-Au alloysThe initial-stage oxidation of (100) Cu-Pt alloys has been examined by in situ environmental transmission electron microscopy and ex situ atomic force microscopy (AFM). It is shown that the oxidation proceeds via the nucleation and growth of Cu 2 O islands that show dependence on the alloy composition and oxidation temperature. The kinetic measurements on the oxide nucleation reveal that both the nucleation density and surface coverage of Cu 2 O islands can be promoted by alloying more Pt in the Cu-Pt alloys. Increasing the oxidation temperature above 700 C results in the growth of large Cu 2 O islands that transits to a dendritic growth morphology. The ex situ AFM studies reveal that the nucleation of oxide islands can occur on surface terraces and the subsequent oxide growth depletes local terrace Cu atoms that results in the formation of surface pits. V C 2015 AIP Publishing LLC. [http://dx.

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“…Figs. 1-3 show that there is no (or very little) oxide formation on the planar surfaces (i.e., having their normal parallel to the electron beam), as inferred by the absence of moire-fringe contrast in the TEM images [11]. One can also note that the TEM electron-beam irradiation has a negligible effect on the observed oscillatory oxide growth as evidenced by the lack of oscillatory growth on flattened surface under the same e-beam irradiation condition.…”

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confidence: 99%

“…However, because the (430) facet is composed of an alternate stacking of a three-atomic-spacing-wide (110) terrace and a monoatomic-height (100) step, we have chosen to model a stepped surface consisting of two (110) terraces separated by a single-atomic-wide (100) step, which forms a single unit of the (430) [11,32].…”

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confidence: 99%