The interaction of Pt with TiO2(110) surfaces: a comparative XPS, UPS, ISS, and ESD study

Schierbaum, K.D.; Fischer, Stefan; Torquemada, M. C.; Segovia, J.L. de; Román, E.; Martín‐Gago, José A.

doi:10.1016/0039-6028(95)00887-x

Cited by 210 publications

(152 citation statements)

References 31 publications

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“…[2,[8][9][10]. Nevertheless, the present EXAFS results reject the hypothesis of the five-fold Ti adsorption site for Ni.…”

Section: Methodssupporting

confidence: 46%

“…Most of those studies have indicated that the metal interacts mainly with oxygen, especially bridging oxygen atoms [3][4][5][6]. On the other hand, experiments on metal clusters and TiO2(110) such as XPS and STM have suggested that the metal preferably interacted with the five-fold Ti sites [7][8][9][10]. This contradiction might arise from the lack of direct information related to the bond between the single metal atom and the TiO2 surface.…”

Section: Introductionmentioning

confidence: 99%

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Structure of low coverage Ni atoms on the TiO2(110) surface – Polarization dependent total-reflection fluorescence EXAFS study

Koike

Ijima

Chun

et al. 2006

Chemical Physics Letters

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The structure of low coverage Ni atoms on the TiO2(110) surface was studied using polarization dependent EXAFS. We found that Ni atoms interacted with oxygen atoms at the n 1 1 step edges, where atomically dispersed Ni species were found with Ni-O distances at 0.199 ± 0.002 nm and 0.204 ± 0.003 nm in parallel and perpendicular directions to the Koike et. al. 2 TiO2(110) surface, respectively. The location corresponded to the virtual Ti site if the next TiO2 layer was created on the topmost TiO2 surface. The Ni location is mainly determined by the dangling bond directions of the surface oxygen atoms.

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“…[2,[8][9][10]. Nevertheless, the present EXAFS results reject the hypothesis of the five-fold Ti adsorption site for Ni.…”

Section: Methodssupporting

confidence: 46%

Section: Introductionmentioning

confidence: 99%

Structure of low coverage Ni atoms on the TiO2(110) surface – Polarization dependent total-reflection fluorescence EXAFS study

Koike

Ijima

Chun

et al. 2006

Chemical Physics Letters

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“…41 Because the cutoff photon energy of a mercury lamp is 4.9 eV, the Au surface can photoemit, while the TiO 2 substrate cannot, leading to Near-field imaging of surface plasmon resonance Q Sun et al 2 the image contrast in Figure 1c that results from the difference in the work function. For the femtosecond laser pulses, a one-photon energy is insufficient to overcome the work function and emit electrons.…”

Section: Resultsmentioning

confidence: 99%

Direct imaging of the near field and dynamics of surface plasmon resonance on gold nanostructures using photoemission electron microscopy

et al. 2013

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Localized surface plasmon resonance (LSPR) can be supported by metallic nanoparticles and engineered nanostructures. An understanding of the spatially resolved near-field properties and dynamics of LSPR is important, but remains experimentally challenging. We report experimental studies toward this aim using photoemission electron microscopy (PEEM) with high spatial resolution of sub-10 nm. Various engineered gold nanostructure arrays (such as rods, nanodisk-like particles and dimers) are investigated via PEEM using near-infrared (NIR) femtosecond laser pulses as the excitation source. When the LSPR wavelengths overlap the spectrum of the femtosecond pulses, the LSPR is efficiently excited and promotes multiphoton photoemission, which is correlated with the local intensity of the metallic nanoparticles in the near field. Thus, the local field distribution of the LSPR on different Au nanostructures can be directly explored and discussed using the PEEM images. In addition, the dynamics of the LSPR is studied by combining interferometric time-resolved pump-probe technique and PEEM. Detailed information on the oscillation and dephasing of the LSPR field can be obtained. The results identify PEEM as a powerful tool for accessing the near-field mapping and dynamic properties of plasmonic nanostructures. Keywords: femtosecond laser; local field enhancement; near-field imaging; photoemission electron microscopy; surface plasmon resonance INTRODUCTION Because of the rapid development of nanofabrication techniques, metallic nanostructures that can exhibit localized surface plasmon resonance (LSPR) can be fabricated using several methods. The resonance frequency and amplitude of LSPR on metallic nanostructures are known to depend on the metal materials, shapes, and surrounding media. [1][2][3][4] In addition, the LSPR can confine optical fields in nanoscale space, leading to the so-called local field enhancement effect. These unique properties promote the application of LSPR in many fields, such as surface-enhanced Raman scattering, 5-8 sensing, 1,9,10 plasmonassisted photochemical reactions 4,11,12 and photocurrent generation. [13][14][15] To further understand the LSPR mechanism and to optimize the design of the plasmonic nanostructures for most applications, the near-field properties of the LSPR fields (especially the near-field distribution of the plasmonic nanostructures) must be determined. To date, investigations of the optical properties of LSPR have largely relied on far-field spectroscopic techniques or numerical simulations. Several experimental approaches have been utilized to visualize the near field, including scanning photoionization microscopy, 16,17 scanning near-field optical microscopy, 18-21 nonlinear luminescence or fluorescent microscopy, 22,23 nonlinear photopolymerization 24,25 and near-field ablation of a substrate. [26][27][28][29] However, these approaches have

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“…These include atomic force microscopy, 11,12 high-resolution electron microscopy, 11,13 x-ray photoelectron spectroscopy, 12,[14][15][16] ultraviolet photoemission spectroscopy, 15,17 transmission electron microscopy, 18 and scanning tunneling microscopy. 3,19,20 While Pt/ TiO 2 has been the prototype system for strong-metal-support interaction where the reactivity of the metal particle is strongly modified by the presence of the support either by an electronic interaction between the metal and the support or by a chemical exchange that leads to the encapsulation of Pt clusters by reduced oxides, 16,20,21 Au/ TiO 2 does not undergo significant encapsulation under equivalent annealing conditions.…”

Section: Introductionmentioning

confidence: 99%

Modeling the noble metal/TiO2 (110) interface with hybrid DFT functionals: A periodic electrostatic embedded cluster model study

Ammal

Heyden

2010

The Journal of Chemical Physics

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Articles you may be interested inEmbedded cluster density functional and second-order Møller-Plesset perturbation theory study on the adsorption of N2 on the rutile (110) This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation. The interaction of Au n and Pt n ͑n=2,3͒ clusters with the stoichiometric and partially reduced rutile TiO 2 ͑110͒ surfaces has been investigated using periodic slab and periodic electrostatic embedded cluster models. Compared to Au clusters, Pt clusters interact strongly with both stoichiometric and reduced TiO 2 ͑110͒ surfaces and are able to enhance the reducibility of the TiO 2 ͑110͒ surface, i.e., reduce the oxygen vacancy formation energy. The focus of this study is the effect of Hartree-Fock exchange on the description of the strength of chemical bonds at the interface of Au/Pt clusters and the TiO 2 ͑110͒ surface. Hartree-Fock exchange helps describing the changes in the electronic structures due to metal cluster adsorption as well as their effect on the reducibility of the TiO 2 surface. Finally, the performance of periodic embedded cluster models has been assessed by calculating the Pt adsorption and oxygen vacancy formation energies. Cluster models, together with hybrid PBE0 functional, are able to efficiently compute reasonable electronic structures of the reduced TiO 2 surface and predict charge localization at surface oxygen vacancies, in agreement with the experimental data, that significantly affect computed adsorption and reaction energies.

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The interaction of Pt with TiO2(110) surfaces: a comparative XPS, UPS, ISS, and ESD study

Cited by 210 publications

References 31 publications

Structure of low coverage Ni atoms on the TiO2(110) surface – Polarization dependent total-reflection fluorescence EXAFS study

Structure of low coverage Ni atoms on the TiO2(110) surface – Polarization dependent total-reflection fluorescence EXAFS study

Direct imaging of the near field and dynamics of surface plasmon resonance on gold nanostructures using photoemission electron microscopy

Modeling the noble metal/TiO2 (110) interface with hybrid DFT functionals: A periodic electrostatic embedded cluster model study

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