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Articles de revues sur le sujet « Overlayer »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

SINGH, RANBER. "MAGNETIC COUPLING IN PSEUDOMORPHIC 2ML OVERLAYERS AND SANDWICH SUPERLATTICE STRUCTURES OF Cr, Mn, Fe, Co AND Ni ON FCC Cu(001)." International Journal of Modern Physics B 24, no. 04 (2010): 405–12. http://dx.doi.org/10.1142/s0217979210055007.

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The magnetic coupling in pseudomorphic overlayer and sandwich structures of 2ML magnetic ultrathin films on Cu (001) substrate is investigated by using spin-polarized density functional theory. The 2ML magnetic overlayers have significant magnetic moment except CrNi overlayer for which magnetic moment is very small (0.004 μB/ atom ). The overlayers having one layer of Cr turn out to be antiferromagnetically coupled except CrNi/Cu overlayer which has ferromagnetic coupling. All other overlayers have ferromagnetic coupling. In contrast to ferromagnetic MnMn/Cu overlayer, the Cu/MnMn/Cu sandwich

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2

Pick, Štěpán. "Tailoring the Surface Reactivity: Comparison of Pd/Nb(110) and Rh/Nb(110)." Collection of Czechoslovak Chemical Communications 73, no. 6-7 (2008): 745–54. http://dx.doi.org/10.1135/cccc20080745.

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Ni, Pd and Pt overlayers deposited on many metallic surfaces show properties resembling those of noble metals. We pose the question whether a similar trend might occur also for other transition-metal overlayers. To this goal, we perform first-principles density-functional theory calculations for Pd(111), Rh(111) surfaces, Pd and Rh epitaxial monolayers deposited on Nb(110), and for CO chemisorption on these systems. Density functional calculations indicate that the behavior of the two overlayers is quite different. Whereas the Rh overlayer on Nb(110) resembles the Rh(111) surface, for the Pd o

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3

WANG, Y. R., J. A. KUBBY, and W. J. GREENE. "THIN FILM ELECTRON INTERFEROMETRY." Modern Physics Letters B 05, no. 21 (1991): 1387–405. http://dx.doi.org/10.1142/s0217984991001696.

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Electron transport through thin overlayers of tin grown on a silicon substrate, and stacking-fault contrast in topographic and conductivity images of Si (111) – 7 × 7 are investigated. Resonances that depend on structural integrity of the overlayer are observed in the conductivity images, and are interpreted as consequences of electron standing-wave formation within the overlayer. The experimental spectra are analyzed using a one-dimensional model which has scattering potentials located at the sample surface and at the overlayer-substrate interface. The agreement between experiment and theory

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4

Jeong, Davin, Gieun Jang, and Soonwook Hong. "Thermally Stable Silver Cathode Covered by Samaria-Doped Ceria for Low-Temperature Solid Oxide Fuel Cells." Nanomaterials 14, no. 7 (2024): 561. http://dx.doi.org/10.3390/nano14070561.

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Samaria-doped ceria (SDC) overlayers were deposited on Ag cathodes by sputtering. The SDC sputtering time was varied to investigate the properties of the Ag–SDC overlayer cathode-coated fuel cells depending on the thickness of the SDC overlayers. Among the fabricated fuel cells, Ag with a 10-nm-thick SDC overlayer (Ag-SDC10) cathode-coated fuel cell exhibited the highest peak power density of 6.587 mW/cm2 at 450 °C, showing higher performance than a pristine Pt-coated fuel cell. Moreover, electrochemical impedance spectroscopy revealed that the Ag-SDC10 cathode-coated fuel cell significantly m

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5

Cordill, M. J., N. R. Moody, and D. F. Bahr. "Quantifying improvements in adhesion of platinum films on brittle substrates." Journal of Materials Research 19, no. 6 (2004): 1818–25. http://dx.doi.org/10.1557/jmr.2004.0232.

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This study used nanoindentation coupled with stressed overlayers to evaluate the effect of titanium interlayers on the interfacial fracture energy of platinum films on SiO2 substrates. Interfacial fracture energy was calculated three ways: from platinum buckles that formed spontaneously upon deposition of the film, from buckles that formed upon deposition of a stressed tungsten overlayer, and from blisters triggered by indentation of a platinum film with a tungsten stressed overlayer. The calculated values for the interfacial fracture energy of the Pt-SiO2 interface were 0.2 and 0.5 J/m2 for i

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Song, Jaewon, Hye Ryeong Kim, Jaehoo Park, Seehwa Jeong, and Cheol Seong Hwang. "Oxidation Behavior of TiAlN Barrier Layers with and without Thin Metal Overlayers for Memory Capacitor Applications." Journal of Materials Research 17, no. 7 (2002): 1789–94. http://dx.doi.org/10.1557/jmr.2002.0265.

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The oxidation behavior of sputtered TiAlN thin-film barrier layers was studied by cross-section transmission electron microscopy. Bare 100-nm-thick TiAlN films on SiO2/Si began to oxidize from the surface after annealing in air for 10 min from about 550 °C. Annealing at 700 °C oxidized half of the layer thickness. A 100-nm-thick Pt overlayer on the barrier layer retarded macroscopic oxidation at 650 °C. However, a 10-nm-thick Pt overlayer accelerated oxidation as a result of the catalytic dissociation of O2 molecules to form O atoms, which oxidized the barrier layer at 550 °C to the same exten

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Lindgren, S. Å., and L. Walldén. "Overlayer states." Surface Science 211-212 (April 1989): 394–403. http://dx.doi.org/10.1016/0039-6028(89)90795-4.

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Lindgren, S. Å., and L. Walldén. "Overlayer states." Surface Science Letters 211-212 (April 1989): A124. http://dx.doi.org/10.1016/0167-2584(89)90343-5.

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Kerdja, T., F. Dahmani, and D. Ghobrini. "Simple evidence of radiation transport in coated plastic targets." Laser and Particle Beams 9, no. 2 (1991): 563–68. http://dx.doi.org/10.1017/s0263034600003578.

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Planar coated targets of Aluminum and Gold overlayers were irradiated with 1.06-μm laser light at intensities 1011–5 × 1013 W/cm2. The energy penetration depth, the ablated plasma, and the X-ray emission were characterized. Results show significant energy transport through the overlayer.

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10

DE COSS, R. "ELECTRONIC STRUCTURE OF STRAINED VANADIUM OVERLAYERS ON W(100) AND Ta(100)." Surface Review and Letters 03, no. 04 (1996): 1505–9. http://dx.doi.org/10.1142/s0218625x96002503.

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We study the role of hybridization and overlayer–substrate lattice mismatch in determining the surface electronic structure of strained V monolayers and bilayers on W(100) and Ta(100). The local density of states is calculated in the tight-binding approximation within the surface-Green-function-matching formalism. For one monolayer of V on W(100) and Ta(100), the strong monolayer–substrate 3d–5d hybridization determines the features of the surface local density of states, with essentially no differences between 1V/W(100) and 1V/Ta(100). For the bilayer we find that the electronic structure of

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11

Li, Haobo, Jianping Xiao, Qiang Fu, and Xinhe Bao. "Confined catalysis under two-dimensional materials." Proceedings of the National Academy of Sciences 114, no. 23 (2017): 5930–34. http://dx.doi.org/10.1073/pnas.1701280114.

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Confined microenvironments formed in heterogeneous catalysts have recently been recognized as equally important as catalytically active sites. Understanding the fundamentals of confined catalysis has become an important topic in heterogeneous catalysis. Well-defined 2D space between a catalyst surface and a 2D material overlayer provides an ideal microenvironment to explore the confined catalysis experimentally and theoretically. Using density functional theory calculations, we reveal that adsorption of atoms and molecules on a Pt(111) surface always has been weakened under monolayer graphene,

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12

Davidson, Alisha L., Paul B. Webb, Stewart F. Parker, and David Lennon. "An Inelastic Neutron Scattering Investigation of the Temporal Behaviour of the Hydrocarbonaceous Overlayer of a Prototype Fischer-Tropsch to Olefins Catalyst." Topics in Catalysis 64, no. 9-12 (2021): 631–37. http://dx.doi.org/10.1007/s11244-021-01419-y.

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AbstractA dual sodium and sulfur promoted haematite, representative of a candidate Fischer-Tropsch to olefins (FTO) catalyst, is prepared and contrasted with the performance of an unpromoted hematite sample in the ambient pressure CO hydrogenation reaction at 623 K as a function of time-on-stream (0–24 h). In-situ post-reaction temperature-programmed oxidation measurements show the carbon evolutionary phase of the catalyst conditioning process to be retarded for the FTO catalyst. Ex-situ inelastic neutron scattering measurements show the promoters perturb the formation of a previously describe

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13

Chai, Herzl, and Brian Lawn. "Role of Adhesive Interlayer in Transverse Fracture of Brittle Layer Structures." Journal of Materials Research 15, no. 4 (2000): 1017–24. http://dx.doi.org/10.1557/jmr.2000.0145.

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The role of a soft adhesive interlayer in determining critical conditions for fracture in brittle layer structures from indentation with hard spheres is investigated. A model transparent trilayer system consisting of a glass plate overlayer (thickness range 80 μm to 2 mm) joined to a glass plate underlayer (thickness 5.6 mm) by an epoxy adhesive (thickness range 5 μm to 8 mm), loaded at its top surface with a hard tungsten carbide sphere (radius 3.96 mm), facilitatesin situobservations of the crack initiation and propagation. Whereas in bulk glass fracture occurs by inner Hertzian cone crackin

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Dias, Luís P., Filipe C. Correia, Joana M. Ribeiro, and Carlos J. Tavares. "Photocatalytic Bi2O3/TiO2:N Thin Films with Enhanced Surface Area and Visible Light Activity." Coatings 10, no. 5 (2020): 445. http://dx.doi.org/10.3390/coatings10050445.

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Bi2O3 nanocone films functionalized with an overlayer of TiO2 were deposited by d.c. reactive magnetron sputtering. The aforementioned nanocone structures were formed via a vapour-liquid-solid (VLS) growth, starting from a catalytic bismuth seed layer. The resultant nanocones exhibit an improved surface area, measured by atomic force microscopy, when compared to non-VLS deposition of the same metal oxide. X-ray diffraction texture analysis enabled the determination of the crystallographic β-phase of Bi2O3. A very thin TiO2 overlayer (6 nm thick), undoped and doped with nitrogen, was deposited

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15

McKenzie, M. T., and J. L. Koenig. "Further Developments in the Methodology of Surface Analysis by FT-IR: Quantitative Aspects of Diffuse Reflectance Methods." Applied Spectroscopy 39, no. 3 (1985): 408–12. http://dx.doi.org/10.1366/0003702854248755.

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The quantitative aspects of diffuse reflectance FT-IR are explored for standard E-glass/AAPS ( N-2-aminoethyl-3-aminopropyltrimethoxysilane) treated samples. Nondestructive sample preparation procedures are used. One generates calibration curves by plotting the normalized integrated intensity of the coupling agent bands in the 2990–2800 and 1700–1500 cm−1 regions vs. the concentration of the treatment solution. The data are derived by DRIFT spectroscopy, and the above results are plotted for the overlayer technique as well as for no overlayer. The scatter in the quantitative data due to fiber

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16

MANNSFELD, STEFAN C. B., and TORSTEN FRITZ. "ADVANCED MODELLING OF EPITAXIAL ORDERING OF ORGANIC LAYERS ON CRYSTALLINE SURFACES." Modern Physics Letters B 20, no. 11 (2006): 585–605. http://dx.doi.org/10.1142/s0217984906011189.

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A fine balance between weak molecule-molecule interactions and usually only weakly laterally varying molecule-substrate interactions governs the physical structure of organic-inorganic and organic-organic heteroepitaxial thin films. Therefore, it is important to investigate the energetics of realistically large overlayer domains. So far, Potential calculations for large domains of organic overlayers on crystalline substrates were computationally demanding due to the vast number of atoms to be considered. Here, we present a technique which for the first time enables the calculation of both the

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17

Okuhara, T., and J. M. White. "Selective electron-induced decomposition of CVD SiO2 overlayers on oxides." Journal of Materials Research 2, no. 5 (1987): 610–13. http://dx.doi.org/10.1557/jmr.1987.0610.

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The electron-induced decomposition (EID) of SiO2 overlayers on various high surface area oxide substrates was studied using Auger electron analysis (AES). Bulk SiO2 was stable upon electron bombardment, but bulk Al2O3 decomposed readily to elemental Al when the primary electron beam energy was 2 keV and the beam current was 6–16 μA. On the other hand, SiO2 overlayers having an average thickness of about 10 Å on Al2O3 decomposed selectively under the same conditions. In contrast to Al2O3 substrates, SiO2 overlayers on TiO2, ZrO2, and MgO were quite stable to the same electron bombardment. There

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18

ANDERSEN, JESPER N. "HIGH-RESOLUTION CORE-LEVEL PHOTOEMISSION INVESTIGATIONS OF ALKALI ON ALUMINUM ADSORPTION SYSTEMS." Surface Review and Letters 02, no. 03 (1995): 345–57. http://dx.doi.org/10.1142/s0218625x95000340.

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The use of high-resolution core-level photoemission spectroscopy for investigating the geometrical aspects of alkali adsorption on aluminum surfaces is reviewed. Examples are given of the use of the technique for studies of the submonolayer growth modes of alkali overlayers, of the geometry of the strongly reconstructed ordered overlayer structures, and of temperature-induced phase transformations between metastable and stable alkali-induced structures.

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19

Lee, Hak Hyeon, Dong Su Kim, Ji Hoon Choi, et al. "Optimal n-Type Al-Doped ZnO Overlayers for Charge Transport Enhancement in p-Type Cu2O Photocathodes." Micromachines 12, no. 3 (2021): 338. http://dx.doi.org/10.3390/mi12030338.

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An effective strategy for improving the charge transport efficiency of p-type Cu2O photocathodes is the use of counter n-type semiconductors with a proper band alignment, preferably using Al-doped ZnO (AZO). Atomic layer deposition (ALD)-prepared AZO films show an increase in the built-in potential at the Cu2O/AZO interface as well as an excellent conformal coating with a thin thickness on irregular Cu2O. Considering the thin thickness of the AZO overlayers, it is expected that the composition of the Al and the layer stacking sequence in the ALD process will significantly influence the charge

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20

Wang, Zumin, Lars P. H. Jeurgens, Jiang Y. Wang, Fritz Phillipp, and E. J. Mittemeijer. "High-resolution transmission-electron-microscopy study of ultrathin Al-induced crystallization of amorphous Si." Journal of Materials Research 24, no. 11 (2009): 3294–99. http://dx.doi.org/10.1557/jmr.2009.0404.

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The process of ultrathin Al-induced crystallization of amorphous Si (a-Si) has been investigated by using high-resolution transmission electron microscopy and Auger electron spectroscopic depth profiling. Ultrathin Al overlayers, with thicknesses of 2.0 and 4.5 nm, have been shown to be capable of inducing full crystallization of an a-Si bottom layer as thick as 40 nm at temperatures as low as 320 °C. After full crystallization of a-Si, the Al of the original 2.0-nm Al overlayer completely moved through the Si layer, leaving a high-purity, large-grained crystalline Si layer above it. Such move

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21

Capdevila-Cortada, Marçal. "The overlayer trade-off." Nature Catalysis 4, no. 4 (2021): 261. http://dx.doi.org/10.1038/s41929-021-00614-0.

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22

Zalm, P. C. "Overlayer corrections in XPS." Surface and Interface Analysis 26, no. 5 (1998): 352–58. http://dx.doi.org/10.1002/(sici)1096-9918(19980501)26:5<352::aid-sia378>3.0.co;2-l.

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23

Martinez, Miranda, and Anil R. Chourasia. "Characterization of Ti/SnO2 Interface by X-ray Photoelectron Spectroscopy." Nanomaterials 12, no. 2 (2022): 202. http://dx.doi.org/10.3390/nano12020202.

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The Ti/SnO2 interface has been investigated in situ via the technique of x-ray photoelectron spectroscopy. Thin films (in the range from 0.3 to 1.1 nm) of titanium were deposited on SnO2 substrates via the e-beam technique. The deposition was carried out at two different substrate temperatures, namely room temperature and 200 °C. The photoelectron spectra of tin and titanium in the samples were found to exhibit significant differences upon comparison with the corresponding elemental and the oxide spectra. These changes result from chemical interaction between SnO2 and the titanium overlayer at

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Griffiths, Lee, and Les Bradley. "Calculation of Carbonaceous Overlayer Thickness in XPS to Yield Substrate Stoichiometries." Applied Spectroscopy 46, no. 9 (1992): 1426–30. http://dx.doi.org/10.1366/0003702924123809.

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A method has been developed which calculates the thickness of the hydrocarbon overlayer from x-ray photoemission spectroscopy (XPS) spectra. The method is specific to each sample and utilizes the relative intensity of the C 1 s peak and all other peaks. Attenuations calculated with this overlayer thickness yield more accurate substrate stoichiometries. A rough-sample model is also developed which not only explains previous anomalies in the thickness of hydrocarbon overlayer calculated but is capable of yielding further accuracy in substrate stoichiometries.

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Aytug, T., A. Goyal, N. Rutter та ін. "High critical current density YBa2Cu3O7–δ coatings on LaMnO3-buffered biaxially textured Cu tapes for coated conductor applications". Journal of Materials Research 18, № 4 (2003): 872–77. http://dx.doi.org/10.1557/jmr.2003.0120.

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High critical current density (high-Jc) YBa2Cu3O7–δ (YBCO) films were obtained by pulsed laser ablation on biaxially textured Cu substrates. To achieve epitaxy of LaMnO3 (LMO) on Cu, thin epitaxial Ni overlayers were deposited on Cu tapes. The structure comprises the layer sequence of YBCO/LMO/Ni/Cu. For 200-nm-thick YBCO, self-field Jc values exceeding 1 × 106 A/cm2 at 77 K were achieved. Characterization of these short prototype conductors revealed good structural and morphological properties. Magnetic analysis suggested that hysteretic loss due to the ferromagnetic Ni overlayer is minimal.

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Davis, G. D. "Overlayer interactions with (HgCd)Te." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 6, no. 3 (1988): 1939–45. http://dx.doi.org/10.1116/1.575210.

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Lu, Wen-Chang, Tao Zhang, and Kai-Ming Zhang. "Impurity Effects on Overlayer Structures." Communications in Theoretical Physics 18, no. 4 (1992): 395–98. http://dx.doi.org/10.1088/0253-6102/18/4/395.

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Sudagar, Alcina Johnson, Neha Venkatesh Rangam, Artur Ruszczak, et al. "Valorization of Brewery Wastes for the Synthesis of Silver Nanocomposites Containing Orthophosphate." Nanomaterials 11, no. 10 (2021): 2659. http://dx.doi.org/10.3390/nano11102659.

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Brewery wastes from stage 5 (Wort precipitate: BW5) and stage 7 (Brewer’s spent yeast: BW7) were valorized for the synthesis of silver phosphate nanocomposites. Nanoparticles were synthesized by converting silver salt in the presence of brewery wastes at different temperatures (25, 50, and 80 °C) and times (10, 30, and 120 min). Unexpectedly, BW7 yielded Ag3PO4 nanoparticles with minor contents of AgCl and Ag metal (Agmet). Contrastingly, BW5 produced AgCl nanoparticles with minor amounts of Ag3PO4 and Agmet. Nanocomposites with different component ratios were obtained by simply varying the sy

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Secchi, Valeria, Stefano Franchi, Monica Dettin, et al. "Hydroxyapatite Surfaces Functionalized with a Self-Assembling Peptide: XPS, RAIRS and NEXAFS Study." Nanomaterials 10, no. 6 (2020): 1151. http://dx.doi.org/10.3390/nano10061151.

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Hydroxyapatite (HAP) coatings can improve the biocompatibility and bioactivity of titanium alloys, such as Ti6Al4V, commonly used as material for orthopedic prostheses. In this framework, we have studied the surface of HAP coatings enriched with Mg and either Si or Ti deposited by RF magnetron sputtering on Ti6Al4V. HAP coatings have been furtherly functionalized by adsorption of a self-assembling peptide (SAP) on the HAP surface, with the aim of increasing the material bioactivity. The selected SAP (peptide sequence AbuEAbuEAbuKAbuKAbuEAbuEAbuKAbuK) is a self-complementary oligopeptide able t

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Chen, Yaofei, Xin Xiong, Yu Chen, et al. "MoS2-Nanoflower and Nanodiamond Co-Engineered Surface Plasmon Resonance for Biosensing." Biosensors 13, no. 5 (2023): 506. http://dx.doi.org/10.3390/bios13050506.

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Surface plasmon resonance (SPR) based sensors play an important role in the biological and medical fields, and improving the sensitivity is a goal that has always been pursued. In this paper, a sensitivity enhancement scheme jointly employing MoS2 nanoflower (MNF) and nanodiamond (ND) to co-engineer the plasmonic surface was proposed and demonstrated. The scheme could be easily implemented via physically depositing MNF and ND overlayers on the gold surface of an SPR chip, and the overlayer could be flexibly adjusted by controlling the deposition times, thus approaching the optimal performance.

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Jenkins, S. J., and G. P. Srivastava. "Atomic Structure of a Monolayer of Ge on Si(001)(2 × 1)." Surface Review and Letters 05, no. 01 (1998): 97–100. http://dx.doi.org/10.1142/s0218625x98000207.

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We present results of first-principles pseudopotential calculations for an ordered monolayer growth of Ge on Si(001)(2 × 1). Our results strongly support the asymmetric Ge–Ge dimer model. We also provide a detailed discussion on the nature of the bonding within the overlayer and between the overlayer and the substrate.

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Koin, P. J., A. Kilislioglu, M. Zhou, J. L. Drummond, and L. Hanley. "Analysis of the Degradation of a Model Dental Composite." Journal of Dental Research 87, no. 7 (2008): 661–65. http://dx.doi.org/10.1177/154405910808700712.

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Dental composites undergo material property changes during exposure to the oral environment and may release compounds of potential toxicity, such as bisphenol A. Degradation of dental composites was studied in a simplified overlayer model in which bisphenol A diglycidyl methacrylate (BisGMA) was covalently bound to a porous silicon oxide surface. It was hypothesized that the chemical structure of this overlayer would allow release of bisphenol A, BisGMA, and the decomposition products thereof, upon exposure to water for an extended period. Liquid chromatography mass spectrometry found leaching

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Whitman, L. J., Joseph A. Stroscio, R. A. Dragoset, and R. J. Celotta. "Insulating Cs overlayer on InSb(110)." Physical Review B 44, no. 11 (1991): 5951–54. http://dx.doi.org/10.1103/physrevb.44.5951.

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Richter, Roy, J. G. Gay, and John R. Smith. "Spin Separation in a Metal Overlayer." Physical Review Letters 54, no. 25 (1985): 2704–7. http://dx.doi.org/10.1103/physrevlett.54.2704.

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Pimbley, J. M., T. ‐M Lu, and G. ‐C Wang. "Island coalescence in a chemisorbed overlayer." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 4, no. 3 (1986): 1357–61. http://dx.doi.org/10.1116/1.573570.

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Kwei, C. M., S. Y. Chiou, and Y. C. Li. "Electron inelastic interactions with overlayer systems." Journal of Applied Physics 85, no. 12 (1999): 8247–54. http://dx.doi.org/10.1063/1.370666.

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Mueller, D., T. N. Rhodin, and P. A. Dowben. "Halogen Overlayer Structures on Fe(110)." Berichte der Bunsengesellschaft für physikalische Chemie 90, no. 3 (1986): 281–84. http://dx.doi.org/10.1002/bbpc.19860900325.

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Alibabaei, Leila, Benjamin D. Sherman, Michael R. Norris, M. Kyle Brennaman, and Thomas J. Meyer. "Visible photoelectrochemical water splitting into H2 and O2 in a dye-sensitized photoelectrosynthesis cell." Proceedings of the National Academy of Sciences 112, no. 19 (2015): 5899–902. http://dx.doi.org/10.1073/pnas.1506111112.

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A hybrid strategy for solar water splitting is exploited here based on a dye-sensitized photoelectrosynthesis cell (DSPEC) with a mesoporous SnO2/TiO2 core/shell nanostructured electrode derivatized with a surface-bound Ru(II) polypyridyl-based chromophore–catalyst assembly. The assembly, [(4,4’-(PO3H2)2bpy)2Ru(4-Mebpy-4’-bimpy)Ru(tpy)(OH2)]4+ ([RuaII-RubII-OH2]4+, combines both a light absorber and a water oxidation catalyst in a single molecule. It was attached to the TiO2 shell by phosphonate-surface oxide binding. The oxide-bound assembly was further stabilized on the surface by atomic lay

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Yao, M. H., David J. Smith, and I. E. Wachs. "TEM study of supported catalyst clusters." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 1030–31. http://dx.doi.org/10.1017/s0424820100089469.

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In the present work we have studied two-dimensional metal oxide overlayers (Re2O7, WO3, etc) deposited on a second high-surface-area metal oxide substrate (TiO2, Al2O3, etc). The molecular structure of these surface metal oxide species has been extensively studied in the past decade by Raman spectroscopy and EXAFS because of their importance in catalytic applications. However, direct observations of these overlayers are still needed in order to better understand the basic properties of the overlayer species. High resolution electron microscopy(HREM) is one of the most commonly used methods for

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Service, Erin, Thomas Moehl, Pardis Adams, and S. David Tilley. "Electrochemical Impedance Spectroscopy of Amorphous TiO₂ Protected Photocathodes Under Hydrogen Evolution Conditions." ECS Meeting Abstracts MA2023-01, no. 37 (2023): 2129. http://dx.doi.org/10.1149/ma2023-01372129mtgabs.

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Despite widespread use of electrochemical impedance spectroscopy (EIS) to study multi-layer photoelectrochemical (PEC) cells, the appropriate equivalent circuits describing these devices under hydrogen evolution conditions are not commonly investigated.1 This creates ambiguity with respect to the pathways of charge recombination and ionic movement within layers of the device during operation, therefore limiting rational development of future PEC devices. In this study, amorphous TiO2 (a-TiO2) protected silicon photocathodes have been investigated using EIS to show that these devices behave acc

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Chourasia, A. R., J. L. Hickman, R. L. Miller, G. A. Nixon, and M. A. Seabolt. "X-Ray Photoemission Study of the Oxidation of Hafnium." International Journal of Spectroscopy 2009 (December 25, 2009): 1–6. http://dx.doi.org/10.1155/2009/439065.

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About 20 Å of hafnium were deposited on silicon substrates using the electron beam evaporation technique. Two types of samples were investigated. In one type, the substrate was kept at the ambient temperature. After the deposition, the substrate temperature was increased to 100, 200, and 300∘C. In the other type, the substrate temperature was held fixed at some value during the deposition. For this type, the substrate temperatures used were 100, 200, 300, 400, 500, 550, and 600∘C. The samples were characterized in situ by the technique of X-ray photoelectron spectroscopy. No trace of elemental

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Jang, Ji-Hyun. "(Invited) Morphology-Engineered Hematite for Addressing Short Hole-Diffusion Lengths." ECS Meeting Abstracts MA2024-02, no. 59 (2024): 3936. https://doi.org/10.1149/ma2024-02593936mtgabs.

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This study addresses challenges in photoelectrochemical (PEC) water oxidation on hematite photoanodes, with a focus on overcoming the limited hole diffusion length (~4 nm) and poor electrical properties. To achieve this, an efficient overlayer is integrated onto the branched structure, generating a highly porous architecture by leveraging additional reaction interfaces exploiting the Kirkendall effect. This phenomenon occurs during high-temperature annealing, particularly at the interface of the overlayer and Ti-FeOOH (hematite precursor), utilizing distinct diffusion rates of metal atoms. By

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GÖTHELID, M., B. AUFRAY, H. GIORDANO, et al. "Sb/Cu(111): GROWTH, DISSOLUTION AND SEGREGATION STUDIED BY AES, LEED and PES." Surface Review and Letters 04, no. 06 (1997): 1203–7. http://dx.doi.org/10.1142/s0218625x97001541.

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The room temperature deposition of Sb on to Cu (111) gives rise to two different Sb states as seen from the Sb 4d shallow core level: an adstate similar to the [Formula: see text] structure formed after annealing at 400°C, and an overlayer of unreacted Sb . The unreacted Sb overlayer is rapidly dissolved into a subsurface position in the crystal during annealing, where it forms a quasistable structure which is dissolved very slowly.

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Stinson, William D. H., Robert S. Stinson, Jingjing Jin, et al. "Probing the Active Sites of Oxide Encapsulated Electrocatalysts with Controllable Oxygen Evolution Selectivity." EES Catalysis, 2024. http://dx.doi.org/10.1039/d4ey00074a.

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Wei, Wei, Jiaqi Pan, Haiping Lin, et al. "Growth, coalescence, and etching of two-dimensional overlayers on metals modulated by near-surface Ar nanobubbles." Nano Research, July 29, 2021. http://dx.doi.org/10.1007/s12274-021-3731-2.

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AbstractThe synthesis of high-quality ultrathin overlayers is critically dependent on the surface structure of substrates, especially involving the overlayer-substrate interaction. By using in situ surface measurements, we demonstrate that the overlayer-substrate interaction can be tuned by doping near-surface Ar nanobubbles. The interfacial coupling strength significantly decreases with near-surface Ar nanobubbles, accompanying by an “anisotropic to isotropic” growth transformation. On the substrate containing near-surface Ar, the growth front crosses entire surface atomic steps in both uphil

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Farrens, S. N., J. H. Perepezko, B. L. Doyle, and S. R. Lee. "Thermal Stability of Amorphous Ni-Nb Thin Films for Use as Diffusion Barriers." MRS Proceedings 108 (1987). http://dx.doi.org/10.1557/proc-108-47.

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ABSTRACTThe interdiffusion and crystallization reactions between amorphous Ni-Nb alloy films and Si substrates and several overlayer metals have been monitored by x-ray diffraction and high resolution Rutherford backscattering spectroscopy. Free standing amorphous thin films of Ni-Nb alloys crystallize in one hour at temperatures between 600–625 °C and show little dependence of the crystallization temperature, Tx, on composition over the range from 30–80 at.% Ni. However, in films that are sputter deposited onto Si substrates Tx tends to increase with increasing Nb composition. Ni60Nb40 sample

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Walker, T. G., and H. Hopster. "Magnetic Ordering of Mn Overlayers on Fe (100)." MRS Proceedings 313 (1993). http://dx.doi.org/10.1557/proc-313-381.

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ABSTRACTSpin polarized electron energy loss spectroscopy (SPEELS) was used to probe the magnetic state of mn over layers on Fe (100). Nonzero exchange asymmetries are measured and found to oscillate with a two monolayer period as the mn overlayer thickness is varied, proving that the surface layer of the mn overlayers has a net magnetic moment and that these (100) Magnetic layers are aligned antiferromagnetically. The average exchange splitting of the mn surface layer is found to be 2.9 eV, indicating that the mn surface has a magnetic moment of the order 3 μg. In addition, oxidized mn overlay

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Chang, S. L., T. Guo, W. K. Ford, A. Bowler, and E. S. Hood. "Bismuth Overlayer Formation on GaAs(110)." MRS Proceedings 159 (1989). http://dx.doi.org/10.1557/proc-159-45.

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ABSTRACTThe temperature and coverage dependent ordering of bismuth overlayers on GaAs(110) is examined using low energy electron diffraction (LEED). Sixth order electron diffraction profiles associated with overlayer ordering are observed at coverages of 0.7, 1.0, and 1.5 monolayers (ML) and for temperatures ranging from -110 C to 200 C. The full-width at half-maxima (FWHM) of the sixth-order spots are examined. Profile analysis reveals narrowing widths with increasing annealing temperature, indicating an improvement of the long-range ordering of the overlayers. Differences in inter- and intra

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Johnson, Peter D., N. B. Brookes, and Y. Chang. "Spin Polarized Photoemission Studies of Surfaces and Thin Films." MRS Proceedings 231 (1991). http://dx.doi.org/10.1557/proc-231-49.

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AbstractSpin polarized photoemission is used to study the magnetic states associated with the clean iron (001) surface. These studies reveal evidence for a minority spin surface state in agreement with a first principles calculation. Studies of the same surface with silver and chromium epitaxial overlayers reveal evidence for interface states derived from this state found on the clean surface. In the case of the silver overlayer the binding energy of the new state is found to be dependent on the layer by layer thickness of the overlayer. With chromium overlayers the binding energy for the same

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"Surface reactivity as revealed by photoelectron spectroscopy." Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences 318, no. 1541 (1986): 61–79. http://dx.doi.org/10.1098/rsta.1986.0061.

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The chemical specificity induced by chemisorbed oxygen at atomically clean surfaces is shown to have diverse implications for the fundamental mechanisms of surface processes. Photoelectron spectroscopy, used in a dynamic mode, has enabled the synergistic chemistry associated with the chemistry of coadsorbed molecules (nitric oxide with water and ammonia) at Zn(0001) and Mg(0001) surfaces to be attributed to the activation of the O-H and N -H bonds. The step-wise reduction of chemisorbed nitrogen to NH (a) and NH 2 (a) has been established; with Mg(0001) dehydrogenation of the surface amide rat

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