Fabrication and in situ X-ray photoelectron spectroscopy of granular metal thin films

Shah, S. İsmat; Doele, B.A.; Weerasekera, I.; Unruh, Karl

doi:10.1016/0040-6090(91)90433-x

Cited by 9 publications

(11 citation statements)

References 12 publications

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“…Nevertheless, the same fitted thickness of 1.5± 0.3 nm was obtained for layer 2 for all samples, so the thickness of layer 2 ͑NiO͒ was not affected by annealing. [19][20][21] and as a product in electrochemical reactions of nickel and oxygen. 22 No measurable net magnetic moment was observed for layer 3 in sample A.…”

Section: Discussionmentioning

confidence: 99%

Surface oxidation of Permalloy thin films

2006

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The chemical and magnetic structures of oxides on the surface of Permalloy Ni 81 Fe 19 films were investigated as functions of annealing time with x-ray and polarized neutron reflectometry. For annealing times of less than one hour, the oxide consisted of a 1.5-nm-thick layer of NiO on an Fe oxide layer that was in contact with Permalloy. The Fe oxide thickness increases with annealing time with a parabolic rate constant of 10 −18 cm 2 s −1 ͑for an annealing temperature of 373 K͒. The growth of the oxide layer is limited by the rate at which oxygen appears below the NiO layer. No portion of the oxide region was found to be ferromagnetically ordered for films annealed less than one hour. The growth of the Fe oxide region is well correlated with the measured increase of the second-order magnetic susceptibility for similarly prepared samples.

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Section: Discussionmentioning

confidence: 99%

Surface oxidation of Permalloy thin films

2006

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“…The second explanation was that the compliance variation may be due to sample size effects in a manner similar to anomalous elastic behavior observed in artificially multilayered films. It has previously been reported [7] that in granular Fe-Si02 several oxide phases form at the boundaries between the iron and silica. In contrast to this, no oxide phases are expected to exist between silver and alumina interfaces.…”

Section: Resultsmentioning

confidence: 98%

Nanoidentation Study of the Mechanical Properties of Granular Metal Thin Films

1993

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Nanoindenter techniques have been used to investigate the mechanical properties of Ag-A1 2 0 3 and Fe-SiO 2 granular metal films. A discontinuity in the rate of change of hardness as a function of metal volume fraction p was observed. The discontinuity occurs at the percolation threshold Pc of the metal, and appears to result from a change in the deformation mechanism at pc. A large peak in compliance (inverse modulus) as measured during indentation unloading was observed in the Ag-A120 3 films near Pc, but was not observed for the Fe-SiO2 films. The compliance peak displayed by Ag-A1 2 0 3 is believed to result from debonding at the metal-ceramic interface and subsequent interfacial sliding, and is not an intrinsic materials property.

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“…The peak at higher binding energy was broken down into two Gaussian peaks at 798.6 and 804.5 eV and were attributed to 2p 1/2 and its shake-up satellite for cobalt hydroxide respectively. Although Co 2p 3/2 peak of Co 3 O 4 also occurs in the same region (~779 eV), its presence in the sample was ruled out because of the fact that Co 3 O 4 does not show any satellite peak 89 .…”

Section: Resultsmentioning

confidence: 99%

One-pot synthesis of graphene- cobalt hydroxide composite nanosheets (Co/G NSs) for electrocatalytic water oxidation

Mehmood

Tariq

Zaheer

et al. 2018

Sci Rep

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We report a one-pot method for the preparation of graphene-cobalt hydroxide nanosheets (Co/G NSs) and their use as an effective elelctrocatalyst for water oxidation. Mechanical exfoliation of graphite via sonication produced graphene sheets, which were stabilized by the surface adsorption of a cationic surfactant (CTAB). In a subsequent step, varying amount of a cobalt complex [sodium hexanitrocobaltate(III)] was added which selectively bound with the positively charged head of surfactant. In the last step, cobalt complex was reduced with sodium borohydride to obtain Co/G NSs catalyst. The catalyst showed lower overpotential (280 mV) as compared to benchmark catalysts and decent stability and turnover frequency (TOF: 0.089 s−1) for oxygen evolution reaction (OER).

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Fabrication and in situ X-ray photoelectron spectroscopy of granular metal thin films

Cited by 9 publications

References 12 publications

Surface oxidation of Permalloy thin films

Surface oxidation of Permalloy thin films

Nanoidentation Study of the Mechanical Properties of Granular Metal Thin Films

One-pot synthesis of graphene- cobalt hydroxide composite nanosheets (Co/G NSs) for electrocatalytic water oxidation

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