The oxidation of Mo(100) studied by XPS and surface Raman spectroscopy: the onset of MoO2 formation and the formation of surface polymolybdate

Smudde, George H.; Stair, Peter C.

doi:10.1016/0039-6028(94)90253-4

Cited by 61 publications

(33 citation statements)

References 27 publications

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“…The lower curve shows the same Mo 3d core level peaks for Mo in a MoO 2 environment. In several works 19,20 the peak shape of the Mo 3d core levels in MoO 2 was believed to be due to multiple oxidation states being present. However, others 21,22 have suggested the extended shape on the higher binding energy side is due to the interaction between the produced core level hole and the conduction electrons.…”

Section: Resultsmentioning

confidence: 99%

Growth of the Cr oxides via activated oxygen reactive molecular beam epitaxy: Comparison of the Mo and W oxides

Ingle¹,

Hammond²,

Beasley³

2001

Journal of Applied Physics

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Ballistic performance comparison of monolayer transition metal dichalcogenide MX2 (M = Mo, W; X = S, Se, Te) metal-oxide-semiconductor field effect transistors J. Appl. Phys. 115, 084506 (2014); 10.1063/1.4866872 Physical properties and band structure of reactive molecular beam epitaxy grown oxygen engineered HfO 2 ± x Disparate product distributions observed in Mo ( 3 − x ) W x O y − ( x = 0 -3 ; y = 3 -9 ) reactions with D 2 O and CO 2 Structures of Mo x W ( 3 − x ) O 6 ( x = 0 -3 ) anion and neutral clusters determined by anion photoelectron spectroscopy and density functional theory calculationsThe realization of spin polarized tunnel devices made with CrO 2 , a theorized half-metallic ferromagnet, requires stringent control of surface and interface quality ideally obtainable via molecular beam epitaxy ͑MBE͒ growth. We have studied the MBE growth of all the di-and tri-oxides of the group VIB transition metals ͑Cr, Mo, and W͒, with the aid of a high flux atomic oxygen source and detection scheme, to help understand which oxidation states are reachable. We find that even though we can reach the ϩ6 oxidation state of Cr (CrO 3 ) we are unable to obtain single phase CrO 2 , the ϩ4 oxidation state. One interpretation of our results is that the physical effect of pressure, not solely the oxidation potential, is important to the growth of single phase CrO 2 .

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Section: Resultsmentioning

confidence: 99%

Growth of the Cr oxides via activated oxygen reactive molecular beam epitaxy: Comparison of the Mo and W oxides

Ingle¹,

Hammond²,

Beasley³

2001

Journal of Applied Physics

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“…In those studies Mo 6+ , Mo 0 and two forms of Mo 4+ appeared as the most usual oxidation states of molybdenum. Molybdenum trioxide can exist in two phases: the thermodynamically stable orthorhombic α-MoO 3 and the metastable monoclinic β-MoO 3 phase [7,8]. For numerous applications of MoO 3 , the material is prepared in thin film form [6].…”

Section: Introductionmentioning

confidence: 99%

Electrical transport properties of MoO₃ thin films prepared by laser assisted evaporation

López‐Carreño

Pardo

Zuluaga

et al. 2007

Phys. Status Solidi (c)

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. Qp, 68.55.Jk, 73.25.+i, 73.61.Ng, 81.15.Fg In the present paper the growth of MoO3 thin films on common glass substrates are described. The films were prepared by evaporation of a MoO3 target with a CO2 laser (10.6 µm), operating in the continuous wave mode. The effect of substrate temperature on the crystallographic structure and electrical properties of MoO3 thin films was studied. The chemical composition of the different species formed on the films surface was obtained by X-ray photoelectron spectroscopy (XPS) and the crystalline structure was studied with X-ray diffraction (XRD). The electrical conductivity of the films was determined using the standard four-points method. Conductivity of the films varied from de 10 −9 to 10 −5 (Ωcm) −1 in the 300-600 K temperature range. Arrhenius-type plots for the electrical conductivity indicate the presence of at least two different conduction mechanisms. The I-V characteristic curve shows an ohmic behavior only in the 4.5-60 V range. Outside this interval the I-V curve has a behavior described by a power law.

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“…Hydrated molybdate coatings are known to exhibit features in the range of 940-960 cm -1 and 965 cm -1 is close to assume that a shift of 5cm -1 had occurred and based on the position of the other peaks and reported literature values this appears to be the case (9)(10)(11)(12)(13)(14)(15)(16). The molybdenum oxygen double bond range is 815-835cm -1 and agrees with the observed peak at 820 cm -1 and the proposed 5cm -1 shift (14)(15)(16). The peak that is displayed at 650 cm -1 has been observed on alumina supported molybdenum catalysts and is attributed to their interaction (17).…”

Section: Fourier Transform-infrared Spectroscopymentioning

confidence: 83%

Molybdate-Based Conversion Coatings for Aluminum Alloys Part II: Coating Chemistry

Rodriguez

Chidambaram

2013

ECS Trans.

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In order to prevent the corrosion of aluminum alloys, a chromate conversion coating (CCC) is applied to the surface. However, chromate is a carcinogen and substitutes are being studied for its replacement. In part I of this study, the authors described the development of an environmentally friendly and corrosion protective molybdate conversion coating (MoCC) for aluminum alloy AA2024-T6. In this part, MoCC is characterized and a structure is proposed. Multiple techniques were used to characterize the coating chemistry. Raman and Fourier Transform-Infrared spectroscopies showed the formation of a molybdate based conversion coating on the aluminum alloy surface. X-ray photoelectron spectroscopy (XPS) showed the coating to be composed of multiple molybdenum based species: MoO2, Mo2O5, MoO4 2- and MoO3. Further, MoCC was determined to consist of two layers; the surface layer was composed predominantly of oxidized Mo(VI) whereas the inner layer mostly consisted of reduced Mo(IV) and Mo(V) species.

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The oxidation of Mo(100) studied by XPS and surface Raman spectroscopy: the onset of MoO2 formation and the formation of surface polymolybdate

Cited by 61 publications

References 27 publications

Growth of the Cr oxides via activated oxygen reactive molecular beam epitaxy: Comparison of the Mo and W oxides

Growth of the Cr oxides via activated oxygen reactive molecular beam epitaxy: Comparison of the Mo and W oxides

Electrical transport properties of MoO₃ thin films prepared by laser assisted evaporation

Molybdate-Based Conversion Coatings for Aluminum Alloys Part II: Coating Chemistry

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The oxidation of Mo(100) studied by XPS and surface Raman spectroscopy: the onset of MoO2 formation and the formation of surface polymolybdate

Cited by 61 publications

References 27 publications

Growth of the Cr oxides via activated oxygen reactive molecular beam epitaxy: Comparison of the Mo and W oxides

Growth of the Cr oxides via activated oxygen reactive molecular beam epitaxy: Comparison of the Mo and W oxides

Electrical transport properties of MoO3 thin films prepared by laser assisted evaporation

Molybdate-Based Conversion Coatings for Aluminum Alloys Part II: Coating Chemistry

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Electrical transport properties of MoO₃ thin films prepared by laser assisted evaporation