On the reduction of nickel oxide

Ostyn, K.M.; Carter, C.B.

doi:10.1016/0039-6028(82)90248-5

Cited by 54 publications

(21 citation statements)

References 15 publications

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“…There is no evidence that Au plays a catalytic role in the redox reaction occurring during switching . Modifications in the density of oxygen vacancies under applied voltage have also been studied in NiO films, where growth of a metallic Ni phase has been proposed as the switching mechanism, although with no direct evidence in working devices . The exact oxide reduction mechanisms are therefore still unclear.…”

Section: Resultsmentioning

confidence: 99%

“…[42] Modifications in the density of oxygen vacancies under applied voltage have also been studied in NiO films, where growth of a metallic Ni phase has been proposed as the switching mechanism, [15] although with no direct evidence in working devices. [43,44] The exact oxide reduction mechanisms are therefore still unclear. Studying these in typical resistive switching devices based on planar metal/oxide/metal junctions is problematic as they prevent in situ access for optical or electron microscopies.…”

Section: Introductionmentioning

confidence: 99%

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Electrically Controlled Nano and Micro Actuation in Memristive Switching Devices with On‐Chip Gas Encapsulation

Kos

Astier

Martino

et al. 2018

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Nanoactuators are a key component for developing nanomachinery. Here, an electrically driven device yielding actuation stresses exceeding 1 MPa withintegrated optical readout is demonstrated. 10 nm thick Al O electrolyte films are sandwiched between graphene and Au electrodes. These allow reversible room-temperature solid-state redox reactions, producing Al metal and O gas in a memristive-type switching device. The resulting high-pressure oxygen micro-fuel reservoirs are encapsulated under the graphene, swelling to heights of up to 1 µm, which can be dynamically tracked by plasmonic rulers. Unlike standard memristors where the memristive redox reaction occurs in single or few conductive filaments, the mechanical deformation forces the creation of new filaments over the whole area of the inflated film. The resulting on-off resistance ratios reach 10 in some cycles. The synchronization of nanoactuation and memristive switching in these devices is compatible with large-scale fabrication and has potential for precise and electrically monitored actuation technology.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrically Controlled Nano and Micro Actuation in Memristive Switching Devices with On‐Chip Gas Encapsulation

Kos

Astier

Martino

et al. 2018

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“…Moiré patterns are generally observedif two lattices are stacked on top of each other, while having either a different lattice constant or a different rotational orientation or both at the same time. The problem has been known in epitaxy and surface science for a long time [1][2][3][4], but the topic regained interest after transition metal (TM) catalyzed chemical vapor deposition was identified as a promising growth protocol for graphene (g) [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Indexing moiré patterns of metal-supported graphene and related systems: strategies and pitfalls

Zeller

Günther

2017

New J. Phys.

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Recent citationsImaging the confined surface oxidation of Ni3Al (111) AbstractWe report on strategies forcharacterizing hexagonal coincidence phases by analyzing the involved spatial moiré beating frequencies of the pattern. We derive general properties of the moiré regarding its symmetry and construct the spatial beating frequency é K moir  as the difference between two reciprocal lattice vectors k i  of the two coinciding lattices. Considering reciprocal lattice vectors k i  , with lengths of up to ntimes the respective (1, 0) beams of the two lattices, readily increases the numberof beating frequencies of the nth-order moiré pattern. We predict how many beating frequencies occur in nth-order moirés and show that for one hexagonal lattice rotating above another the involved beating frequencies follow circular trajectories in reciprocal-space. The radius and lateral displacement of such circles are defined by the order n and the ratio x of the two lattice constants. The question ofwhether the moiré pattern is commensurate or not is addressed by using our derived concept of commensurability plots. When searching potential commensurate phases we introduce a method, which we call cell augmentation, and which avoids the need toconsider high-order beating frequencies as discussed using the reported´ ( )R 6 3 6 3 30 moiré of graphene on SiC(0001). We also show how to apply our model for the characterization of hexagonal moiré phases, found for transition metal-supported graphene and related systems. We explicitly treat surface x-ray diffraction-, scanning tunneling microscopy-and low-energy electron diffraction data to extract the unit cell of commensurate phases or to find evidence for incommensurability. For each data type, analysis strategies are outlined and avoidable pitfalls are discussed. We also point out the close relation of spatial beating frequencies in a moiré and multiple scattering in electron diffraction data and show how this fact can be explicitly used to extract high-precision data.

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“…The reduction of metal oxide always proceeds through the formation of metallic nuclei on the particle surface [4,28,40]. We explained earlier that the dissociation of H 2 to produce H on the surface, which is an intermediate required for the reduction of NiO, is more favorable on two neighboring Ni atoms rather than on the adjacent Ni and O atoms [41].…”

Section: Further Discussion Of the Mechanisms Of Nio Reduction With Hmentioning

confidence: 99%

Effects of crystallite size on the kinetics and mechanism of NiO reduction with H₂

Syed‐Hassan

2011

Int J of Chemical Kinetics

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A kinetic investigation on the reduction of nanometer‐sized nickel oxide particles (supported and unsupported) with hydrogen was carried out. The reduction behavior was found to be related to the average size of NiO crystallites. When the NiO crystallite size was less than about 20 nm, the dissociation of H2 was the key rate‐limiting factor and remained unchanged almost throughout the reduction process. However, when the NiO crystallite size was >20 nm, its reduction kinetics changed with conversion, showing two kinetic compensation effects at lower and higher NiO conversion levels. It is believed that the movement and rearrangement of H atoms inside such bulk Ni/NiO solid could be an important aspect of the reduction kinetics, especially at higher (50%–90%) NiO conversion levels. © 2011 Wiley Periodicals, Inc. Int J Chem Kinet 43: 667–676, 2011

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On the reduction of nickel oxide

Cited by 54 publications

References 15 publications

Electrically Controlled Nano and Micro Actuation in Memristive Switching Devices with On‐Chip Gas Encapsulation

Electrically Controlled Nano and Micro Actuation in Memristive Switching Devices with On‐Chip Gas Encapsulation

Indexing moiré patterns of metal-supported graphene and related systems: strategies and pitfalls

Effects of crystallite size on the kinetics and mechanism of NiO reduction with H₂

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On the reduction of nickel oxide

Cited by 54 publications

References 15 publications

Electrically Controlled Nano and Micro Actuation in Memristive Switching Devices with On‐Chip Gas Encapsulation

Electrically Controlled Nano and Micro Actuation in Memristive Switching Devices with On‐Chip Gas Encapsulation

Indexing moiré patterns of metal-supported graphene and related systems: strategies and pitfalls

Effects of crystallite size on the kinetics and mechanism of NiO reduction with H2

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Effects of crystallite size on the kinetics and mechanism of NiO reduction with H₂