Surface Characterization Study of the Thermal Decomposition of Ag2O

Weaver, Jason F.; Hoflund, Gar B.

doi:10.1021/cm00046a022

Cited by 165 publications

(135 citation statements)

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“…The two strong peaks at 373.95 and 367.95 eV correspond to Ag 3d 5/2 and Ag 3d 3/2 , respectively ( Fig. 4a) [20]. The main peak V 2p is located at 516.38 eV (Fig.…”

Section: Xps Analysismentioning

confidence: 91%

Fabrication and characterization of visible-light-induced photocatalyst Gd2O3/Ag3VO4

Sun

et al. 2010

Reac Kinet Mech Cat

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Gd 2 O 3 /Ag 3 VO 4 photocatalysts are synthesized through the impregnation method and characterized by powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and UV-vis diffuse reflectance spectra (DRS). It is shown that Gd 3? is dispersed on the surface of Ag 3 VO 4 in the form of Gd 2 O 3 . The DRS analysis indicates that the ability of visible-light absorption of Gd 2 O 3 /Ag 3 VO 4 catalysts is enhanced greatly. The photocatalytic activities of the samples are evaluated by degradation of Rhodamine B dye under UV and visible-light irradiation, respectively. The experimental results show that the role of Gd 2 O 3 content has a significant impact on the photocatalytic activities of the samples. The mechanism of enhanced photocatalytic activity after the Gd introduction is discussed.

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“…The two strong peaks at 373.95 and 367.95 eV correspond to Ag 3d 5/2 and Ag 3d 3/2 , respectively ( Fig. 4a) [20]. The main peak V 2p is located at 516.38 eV (Fig.…”

Section: Xps Analysismentioning

confidence: 91%

Fabrication and characterization of visible-light-induced photocatalyst Gd2O3/Ag3VO4

Sun

et al. 2010

Reac Kinet Mech Cat

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“…In particular, the C1s photopeak ͓Fig. 6͑a͔͒ was characterized by two components: the main one ͑BE= 284.8 eV͒, assigned to the presence of adventitious carbon, and a second one ͑BE = 287.8 eV͒, ascribed to carbonates or bicarbonates 42,44 arising from atmospheric exposure. Similar attributions were corroborated by the analysis of the O1s signal ͓Fig.…”

Section: Figmentioning

confidence: 99%

“…6͑b͔͒, characterized by a component at BEϷ 533.0 eV due to the silica substrate and a lower BE peak at Ϸ531.1 eV mainly ascribable to Ag 2 CO 3 / AgHCO 3 . 42,44 However, other species could also be responsible for the latter band, including hydroxyl groups and adsorbed H 2 O/O 2 . 41,42 As a general rule, both the O1s and the C1s signals showed a higher CO 3 2− /HCO 3 − contribution for samples characterized by a lower silver content.…”

Section: Figmentioning

confidence: 99%

Silica-supported silver nanoparticles: Tailoring of structure-property relationships

Barreca

Gasparotto

Maragno

et al. 2005

Journal of Applied Physics

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Silica-supported silver nanoparticles were obtained by rf sputtering from Ar plasmas under soft synthesis conditions, with particular attention to the combined influence of rf power and total pressure on the system composition, nanostructure, morphology, and optical properties. In order to attain a thorough insight into the nucleation and growth phenomena of Ag nanoparticles on the silica substrate, several in situ and ex situ characterization techniques were used. In particular, a laser reflection interferometry system was employed for a real-time monitoring of the deposition process, providing useful and complementary information with respect to the other ex situ techniques ͑x-ray photoelectron spectroscopy and x-ray excited Auger electron spectroscopy, glancing incidence x-ray diffraction, atomic force microscopy, optical-absorption spectroscopy, and transmission electron microscopy͒. The above investigations evidenced the formation of silver-based nanosystems ͑average crystallite size ഛ10 nm͒, whose features ͑metal content, Ag particle size and shape, structure and optical properties͒ could be carefully tailored by moderate and controlled variations of the synthesis parameters.

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“…The features in the XP spectra inside the spot-the O 1s peak at 529.2 eV, the Ag 3d peak at 367.9 eV, the narrow d band, the O 2p emission at 2-4 eV, and the absent Fermi edge-are all evidence for Ag 2 O. [4][5][6][7] The features in the XP spectra taken outside the spot-the absent oxidic O 1s peak, the Ag 3d binding energy at the metallic value (368.25 eV), the broad, metallic valence band, and the Fermi edge-are all indicative of a metallic state. [6,7] The small O 1s peak at 528.3 eV stems from O atoms adsorbed on the (4 4)-reconstructed (but metallic) Ag surface.…”

Section: Methodsmentioning

confidence: 93%

“…[8,9] The characteristic shift of the Ag(MNN) transition between the inside and outside areas is fully consistent with the assignment of the spot to Ag 2 O and of the area outside to metallic Ag. [5,6,10] The following mechanism was proposed for the electron-induced oxidation. [1] At 300 K, the temperature at which NO 2 was dosed for the data of Figure 1, NO 2 adsorbs on Ag(111) by dissociation into NO molecules and O atoms.…”

Section: Methodsmentioning

confidence: 99%

Surface Patterning of Silver using an Electron‐ or Photon‐Assisted Oxidation Reaction

Günther¹,

Böcklein²,

Reichelt³

et al. 2010

ChemPhysChem

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We have investigated a recently developed method of patterning Ag surfaces. The method uses an electron beam to irradiate Ag surfaces during NO(2) dosing at 300 K and leads to sharp oxide patterns on otherwise metallic surfaces. Investigations were performed on an Ag(111) single crystal and on an Ag foil with LEEM (low-energy electron microscopy), LEED (low-energy electron diffraction), MEM (mirror electron microscopy), and XPEEM (X-ray photo-emission electron microscopy). The oxidation reaction, which is based on the electron-induced desorption of NO molecules, proceeds in steps, from a layer of O atoms adsorbed on the metallic Ag via an intermediate phase to an amorphous Ag(2)O film. Our measurements evidence a high cross section for electron-induced NO desorption with 30-40 eV electrons, indicating that only a few electrons per adsorbing NO(2) molecule are required to initiate the process. The intermediate phase, which forms a partially ordered quadratic structure, contains oxygen species in an oxide-like environment, coexisting with an adsorbate covered metallic Ag(111) surface. While the intermediate phase dissolves within hours under UHV conditions, fully developed oxide patches, consisting of several layers of thick, amorphous Ag(2)O, are kinetically stable. The oxidation method also works with 40 eV (and 700 eV) photons instead of electrons. In preliminary experiments local patterns could also be created with photons, suggesting that mask techniques can be applied for the process.

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Surface Characterization Study of the Thermal Decomposition of Ag2O

Cited by 165 publications

References 0 publications

Fabrication and characterization of visible-light-induced photocatalyst Gd2O3/Ag3VO4

Fabrication and characterization of visible-light-induced photocatalyst Gd2O3/Ag3VO4

Silica-supported silver nanoparticles: Tailoring of structure-property relationships

Surface Patterning of Silver using an Electron‐ or Photon‐Assisted Oxidation Reaction

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