Oxidation of silver films by atomic oxygen

Moore, William M.; Codella, P. J.

doi:10.1021/j100326a035

Cited by 71 publications

(71 citation statements)

References 2 publications

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“…It is known that thin silver films readily oxidize forming AgO and Ag 2 O. 37 In some noble nanoparticle cases, indications are that it alters metal-metal bond lengths. 38 It is unclear what the effects of a surface oxide layer would be on these particular nanoparticles of silver.…”

Section: A Elastic Constantsmentioning

confidence: 99%

Structural distortions in 5–10 nm silver nanoparticles under high pressure

et al. 2008

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We present experimental evidence that silver nanoparticles in the size range of 5 -10 nm undergo a reversible structural transformation under hydrostatic pressures up to 10 GPa. We have used xray diffraction with a synchrotron light source to investigate pressure-dependent and size-dependent trends in the crystal structure of silver nanoparticles in a hydrostatic medium compressed in a diamond-anvil cell. Results suggest a reversible linear pressure-dependent rhombohedral distortion which has not been previously observed in bulk silver. We propose a mechanism for this transition that considers the bond-length distribution in idealized multiply twinned icosahedral particles. To further support this hypothesis, we also show that similar measurements of single-crystal platinum nanoparticles reveal no such distortions.

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Section: A Elastic Constantsmentioning

confidence: 99%

Structural distortions in 5–10 nm silver nanoparticles under high pressure

et al. 2008

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“…The silver oxide was believed to have been formed by aerial oxidation of elemental silver during the time between its formation and the analysis. This is an unexpected result since, while silver is oxidized by atomic oxygen [9], molecular oxygen may be adsorbed as a surface layer but does not oxidize it at ambient temperature [10]. Elemental sulphur or silver sulphide should be distinguishable from pyrite in the sulphur photoelectron spectrum.…”

Section: Introductionmentioning

confidence: 96%

The interaction of pyrite with solutions containing silver ions

1989

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Linear potential sweep voltammetry and X-ray photoelectron spectroscopy have been used to determine the products of the interaction of pyrite with sulphuric acid solutions containing silver ions. Silver sulphide was found to be the principal product for all reaction times. Initially, some sulphur excess (metal deficiency) in the sulphide lattice was associated with the formation of silver sulphide. The presence of elemental silver in addition to silver sulphide after extended reaction times was evident from the characteristics of voltammograms. This elemental silver was not detected by electron spectroscopy because it was formed as crystallites occupying only a very small area of the surface of the silver sulphide-covered pyrite. Silver sulphide was the only surface silver species present on a pyrite surface during acid iron(III) leaching; elemental sulphur was also identified on such surfaces.

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“…86 In some noble nanoparticle cases, indications are that it alters metal-metal bond lengths. 87 It is unclear what the effects of a surface oxide layer would be on these particular nanoparticles of silver.…”

Section: Surface Oxidationmentioning

confidence: 99%

Size-dependent structure of silver nanoparticles under high pressure

Koski

2008

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Professor A Paul Alivisatos, ChairSilver noble metal nanoparticles, that have a diameter less than 10 nm, often possess multiply twinned grains allowing them to adopt shapes and atomic structures not observed in bulk materials. The properties exhibited by particles with multiply-twinned polycrystalline structures are often far different from those of single-crystalline particles and from the bulk. I will present experimental evidence that silver nanoparticles < 10 nm undergo a reversible structural transformation under hydrostatic pressures up to 10 GPa.Results for nanoparticles in the intermediate size range of 5 to 10 nm suggest a reversible linear pressure-dependent rhombohedral distortion which has not been previously observed in bulk silver. I propose a mechanism for this transition that considers the bond-length distribution in idealized multiply twinned icosahedral particles. At smaller sizes, results for 3.9 nm silver nanoparticles suggest a reversible linear orthorhombic distortion that continuously varies with hydrostatic pressure to 8GPa. This distortion is interpreted in the 2 context of idealized decahedral particles.In addition, given these size-dependent measurements of silver nanoparticle compression with pressure, we have constructed a pressure calibration curve. Encapsulating these silver nanoparticles in hollow metal oxide nanospheres then allows us to measure the pressure inside a nanoshell using x-ray diffraction. We demonstrate the measurement of pressure gradients across nanoshells and show that these nanoshells have maximum resolved shear strengths on the order of 500 MPa to 1GPa.Professor A Paul Alivisatos Dissertation Committee Chair i

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Oxidation of silver films by atomic oxygen

Cited by 71 publications

References 2 publications

Structural distortions in 5–10 nm silver nanoparticles under high pressure

Structural distortions in 5–10 nm silver nanoparticles under high pressure

The interaction of pyrite with solutions containing silver ions

Size-dependent structure of silver nanoparticles under high pressure

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