Screening of ferroelectric domains on BaTiO<sub>3</sub>(001) surface by ultraviolet photo-induced charge and dissociative water adsorption

Wang, J. L.; Vilquin, Bertrand; Barrett, N.

doi:10.1063/1.4748330

Cited by 49 publications

(61 citation statements)

References 15 publications

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“…However, it is worth noting that a difference of ~100 mV between domains is of the same order of magnitude as observed in BiFeO 3 5, Pb(Zr,Ti)O 3 24 and BaTiO 3 25.…”

Section: Resultssupporting

confidence: 51%

“…At higher energy, electrons penetrate the sample surface and are elastically backscattered. The transition between reflection and backscattering provides a direct measure of the surface potential, which can be related to the surface polarization charge of ferroelectric domains52425 and to particular domain walls26. Attempts to determine the surface polarization charge from a single image have also been made272829.…”

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confidence: 99%

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Low energy electron imaging of domains and domain walls in magnesium-doped lithium niobate

Nataf

Grysan

Guennou

et al. 2016

Sci Rep

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The understanding of domain structures, specifically domain walls, currently attracts a significant attention in the field of (multi)-ferroic materials. In this article, we analyze contrast formation in full field electron microscopy applied to domains and domain walls in the uniaxial ferroelectric lithium niobate, which presents a large 3.8 eV band gap and for which conductive domain walls have been reported. We show that the transition from Mirror Electron Microscopy (MEM – electrons reflected) to Low Energy Electron Microscopy (LEEM – electrons backscattered) gives rise to a robust contrast between domains with upwards (Pup) and downwards (Pdown) polarization, and provides a measure of the difference in surface potential between the domains. We demonstrate that out-of-focus conditions of imaging produce contrast inversion, due to image distortion induced by charged surfaces, and also carry information on the polarization direction in the domains. Finally, we show that the intensity profile at domain walls provides experimental evidence for a local stray, lateral electric field.

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“…However, it is worth noting that a difference of ~100 mV between domains is of the same order of magnitude as observed in BiFeO 3 5, Pb(Zr,Ti)O 3 24 and BaTiO 3 25.…”

Section: Resultssupporting

confidence: 51%

mentioning

confidence: 99%

Low energy electron imaging of domains and domain walls in magnesium-doped lithium niobate

Nataf

Grysan

Guennou

et al. 2016

Sci Rep

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“…[23,24] Theobserved exponential increase in this signal with time can be assigned to the spatial redistribution and re-trapping of photocarriers. [26,27] Interestingly, the nature of the product obtained from TiO 2 -AuN Ps as catalysts can be further manipulated by switching the UV exposure on and off as shown in Figure 4. Forinstance,after the formation of PNTP from TiO 2 -AuNPs under SPR excitation and UV exposure (bottom and middle traces), the reduction of PNTP to DMAB was detected when the UV exposure was turned off (top trace) within 5s .T his process was reversible up to three times.F igure S4 shows the SERS spectra of Au NPs that had been functionalized with PNTP as af unction of the laser power, confirming that DMAB can be formed from PNTP upon SPR excitation, [24,25] in agreement with the results obtained from TiO 2 -Auafter the UV exposure was turned off.T he increase in the product formation as af unction of the laser power is in agreement with aS PR-mediated mechanism.…”

Section: Methodsmentioning

confidence: 98%

Controlling the Selectivity of the Surface Plasmon Resonance Mediated Oxidation of p‐Aminothiophenol on Au Nanoparticles by Charge Transfer from UV‐excited TiO₂

2015

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Although catalytic processes mediated by surface plasmon resonance (SPR) excitation have emerged as an ew frontier in catalysis,t he selectivity of these processes remains poorly understood. Here,t he selectivity of the SPR-mediated oxidation of p-aminothiophenol (PATP) employing Au NPs as catalysts was controlled by the choice of catalysts (Au or TiO 2 -Au NPs) and by the modulation of the charge transfer from UV-excited TiO 2 to Au.W hen Au NPs were employed as catalyst, the SPR-mediated oxidation of PATP yielded p,pdimercaptobenzene (DMAB). When TiO 2 -Au NPs were employed as catalysts under both UV illumination and SPR excitation, p-nitrophenol (PNTP) was formed from PATP in as ingle step.I nterestingly,P NTP molecules were further reduced to DMAB after the UV illumination was removed. Our data showthat control over charge-transfer processes may play an important role to tune activity,product formation, and selectivity in SPR-mediated catalytic processes.

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“…However, these materials have a great potential interest not only for microelectronics but also for the photocatalytic production of hydrogen from water splitting . Hence, the water‐adsorption properties of oxides such as BaTiO 3 , SrTiO 3 , PbTiO 3 , and LiNbO 3 , have been investigated in relation to their ferroelectric properties . Apart from water, the interaction of various molecules (CO, NO, alcohols, etc.)…”

Section: Introductionmentioning

confidence: 99%

Application of a sensitive catalytic reactor to the study of CO oxidation over SrTiO₃(100) and BaTiO₃/SrTiO₃(100) ferroelectric surfaces

Nassreddine

Morfin

Niu

et al. 2014

Surface & Interface Analysis

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The use of ferroelectric materials as adsorbents or catalysts could be a promising way to control surface chemical reactions by tuning the ferroelectric polarization. In this context, the oxidation of carbon monoxide over well‐defined SrTiO3(100) and BaTiO3/SrTiO3(100) perovskite surfaces was investigated under stoichiometric gas‐phase conditions at a total pressure of 3 Torr, in the 100–300 °C temperature range. To this aim, an ultrahigh vacuum‐compatible reactor equipped with external laser heating, and specially designed to detect small yields of gaseous products by mass spectrometry, was used. Prior to the catalytic tests, with the help of Auger electron spectroscopy, a sample cleaning procedure under low oxygen pressure was established in order to remove carbon impurities. The as‐prepared surfaces appear poorly active in CO oxidation, but their activity increases if a high‐temperature pre‐annealing treatment under ultrahigh vacuum is applied in order to produce oxygen vacancies, which act as adsorption and/or reaction sites. The activity of the bare SrTiO3 substrates, whether doped with Nb or not, is similar to that of the supported BaTiO3 films, but the latter lose less activity upon evacuation/reaction cycles. Isotopic labeling experiments using 18O2 show that the reaction involves CO (and O2) dissociation, and that lattice oxygen participates to the reaction via the so‐called Mars–van Krevelen mechanism. Copyright © 2014 John Wiley & Sons, Ltd.

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Screening of ferroelectric domains on BaTiO₃(001) surface by ultraviolet photo-induced charge and dissociative water adsorption

Cited by 49 publications

References 15 publications

Low energy electron imaging of domains and domain walls in magnesium-doped lithium niobate

Low energy electron imaging of domains and domain walls in magnesium-doped lithium niobate

Controlling the Selectivity of the Surface Plasmon Resonance Mediated Oxidation of p‐Aminothiophenol on Au Nanoparticles by Charge Transfer from UV‐excited TiO₂

Application of a sensitive catalytic reactor to the study of CO oxidation over SrTiO₃(100) and BaTiO₃/SrTiO₃(100) ferroelectric surfaces

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Screening of ferroelectric domains on BaTiO3(001) surface by ultraviolet photo-induced charge and dissociative water adsorption

Cited by 49 publications

References 15 publications

Low energy electron imaging of domains and domain walls in magnesium-doped lithium niobate

Low energy electron imaging of domains and domain walls in magnesium-doped lithium niobate

Controlling the Selectivity of the Surface Plasmon Resonance Mediated Oxidation of p‐Aminothiophenol on Au Nanoparticles by Charge Transfer from UV‐excited TiO2

Application of a sensitive catalytic reactor to the study of CO oxidation over SrTiO3(100) and BaTiO3/SrTiO3(100) ferroelectric surfaces

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Product

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Screening of ferroelectric domains on BaTiO₃(001) surface by ultraviolet photo-induced charge and dissociative water adsorption

Controlling the Selectivity of the Surface Plasmon Resonance Mediated Oxidation of p‐Aminothiophenol on Au Nanoparticles by Charge Transfer from UV‐excited TiO₂

Application of a sensitive catalytic reactor to the study of CO oxidation over SrTiO₃(100) and BaTiO₃/SrTiO₃(100) ferroelectric surfaces