Molybdenum thin-film growth on rutile titanium dioxide ()

Blondeau-Pâtissier, Virginie; Lian, Guoda; Domenichini, B.; Steinbrunn, A.; Bourgeois, S.; Dickey, Elizabeth C.

doi:10.1016/s0039-6028(02)01383-3

Cited by 10 publications

(8 citation statements)

References 45 publications

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“…The electronic structure of the metal films can be characterized by the φ M of the metal surfaces . Al (100), Cr (100), and Fe (100) were epitaxially grown on STO (100) and TiO 2 (110); , Mo (110) was epitaxially grown on STO (100) and TiO 2 (110) ).…”

Section: Resultsmentioning

confidence: 99%

Metal/Oxide Interfacial Reactions: Oxidation of Metals on SrTiO₃ (100) and TiO₂ (110)

Wagner

2005

J. Phys. Chem. B

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We studied chemical reactions between ultrathin metal films (Al, Cr, Fe, Mo) and single-crystal oxides (SrTiO3 (100), TiO2 (110)) with X-ray photoelectron spectroscopy (XPS). The work function of the metal and the electron density in the oxide strongly influence the reaction onset temperature (T(RO)), where metal oxidation is first observed, and the rate of metal oxidation at the metal/oxide interfaces. The Fermi levels of the two contacting phases affect both the space charges formed at the interfaces and the diffusion of ionic defects across the interfaces. These processes, which determine metal oxidation kinetics at relatively low temperatures, can be understood in the framework of the Cabrera-Mott theory. The results suggest that the interfacial reactivity is tunable by modifying the Fermi level (E(F)) of both contacting phases. This effect is of great technological importance for a variety of devices with heterophase boundaries.

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Section: Resultsmentioning

confidence: 99%

Metal/Oxide Interfacial Reactions: Oxidation of Metals on SrTiO₃ (100) and TiO₂ (110)

Wagner

2005

J. Phys. Chem. B

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“…In many cases the O diffusion and growth of oxidized metals is limited at room temperature. The thickness of the oxidized metal layers ranges from submonolayer coverage (Cr [284], Fe [71,285,286,368], and Mo [351,352]), through ∼2 ML (Nb [29,90], Ti [345,346], and V [29,347,348]), up to ∼3 ML (Hf [28] and Al [335]). Mostéfa-Sba et al studied Fe deposition on TiO 2 (110) by XPS and AES.…”

Section: Metalsmentioning

confidence: 99%

Interaction of nanostructured metal overlayers with oxide surfaces

Wagner

2007

Surface Science Reports

712

651

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“…The crucial issues connected to this topic are the following: (i) the role of the MoO x interface in forming a thicker Mo film, (ii) the structural identification of the Mo−MoO x nanocrystallites, and (iii) the influence of the deposition rate of Mo on the oxidation state of the surface or, in other words, the kinetics of the surface diffusion and the surface reduction−oxidation processes. It is clear from earlier studies that the resistance of Mo nanoclusters to sintering is probably connected with the high activity of Mo toward surface oxygen. ,, This behavior is also revealed in the sensitivity of the growing mode of Mo ultrathin layers (at least in the initial stage) for the stoichiometry of the TiO 2 surfaces. ,, Because of the competitive effects of the kinetics of the surface diffusion of Mo atoms and the reaction with the surface oxygen, the deposition rate and the temperature also determine very sensitively the formation of a MoO x interface. , …”

Section: Introductionmentioning

confidence: 95%

“…Turning our attention to a more specified material system, namely, oxide-supported Mo, MoO x , and Mo x C nanoparticles, it can be established that only a few worksespecially STM studieswere presented in this field. − Most of these works deal with the deposition of Mo on TiO 2 single-crystal surfaces. Mo belongs to the so-called reactive deposits which react easily with the bulk oxygen of the reducible oxides.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Mo Deposited on a TiO₂(110) Surface by Scanning Tunneling Microscopy and Auger Electron Spectroscopy

2005

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The properties of Mo ultrathin films deposited on a TiO2(110) surface were investigated by scanning tunneling microscopy (STM) and spectroscopy (STS), as well as by Auger electron spectroscopy (AES). The substrate exhibited mainly large (1 x 1) terraces decorated by additional [001] rows (missing or added 1D structures) of reduced TiO(x) phases. Only a few percent of the surface exhibited a cross-linked (1 x 2) arrangement. The deposition of Mo layers at room temperature with a rate of approximately 0.4 monolayer/ min resulted in nanoclusters of 1-2 nm with a low-profile shape (2D-like). Preferential decoration of the atomic steps was not found; at the same time, the 1D defect sites of missing or added rows on the (110) terraces were characteristically decorated by larger Mo nanocrystallites. This behavior indicates that the mobility of Mo atoms is higher on the more reduced regions of the substrate. The high dispersion of the Mo adlayer changed only slightly on annealing up to 700 K; in the range of 900-1050 K, however, a significant increase of the particle size accompanied by splitting of the TiO2(110) terraces was observed. This behavior may be explained by the partial oxidation of the supported Mo (accompanied by the reduction of the substrate) into tetragonal crystallites oriented and slightly elongated in the [001] or [110] direction of the TiO2(110) support. STS measurements indicated that the crystallites or the support/crystallite interface formed above 900 K possesses a wide band gap. The annealing above 1050 K resulted in the disappearance of Mo from the TiO2(110) surface, which may be explained by the formation and sublimation of MoO3 species at the perimeter of the nanoparticles. The change of AES signal intensities for O(KLL) and Mo(MNN) as a function of the annealing temperature also supports this mechanism.

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Molybdenum thin-film growth on rutile titanium dioxide ()

Cited by 10 publications

References 45 publications

Metal/Oxide Interfacial Reactions: Oxidation of Metals on SrTiO₃ (100) and TiO₂ (110)

Metal/Oxide Interfacial Reactions: Oxidation of Metals on SrTiO₃ (100) and TiO₂ (110)

Interaction of nanostructured metal overlayers with oxide surfaces

Characterization of Mo Deposited on a TiO₂(110) Surface by Scanning Tunneling Microscopy and Auger Electron Spectroscopy

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Molybdenum thin-film growth on rutile titanium dioxide ()

Cited by 10 publications

References 45 publications

Metal/Oxide Interfacial Reactions: Oxidation of Metals on SrTiO3 (100) and TiO2 (110)

Metal/Oxide Interfacial Reactions: Oxidation of Metals on SrTiO3 (100) and TiO2 (110)

Interaction of nanostructured metal overlayers with oxide surfaces

Characterization of Mo Deposited on a TiO2(110) Surface by Scanning Tunneling Microscopy and Auger Electron Spectroscopy

Contact Info

Product

Resources

About

Metal/Oxide Interfacial Reactions: Oxidation of Metals on SrTiO₃ (100) and TiO₂ (110)

Metal/Oxide Interfacial Reactions: Oxidation of Metals on SrTiO₃ (100) and TiO₂ (110)

Characterization of Mo Deposited on a TiO₂(110) Surface by Scanning Tunneling Microscopy and Auger Electron Spectroscopy