Instrumentation

Bauer, E.

doi:10.1007/978-1-4939-0935-3_3

Cited by 3 publications

(3 citation statements)

References 254 publications

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“…LEEM and LEED, as well as X-ray photo-emission electron microscopy (XPEEM) experiments, were carried out using the spectroscopic photoemission and low-energy electron microscope (SPELEEM). This instrument combines the structural information from LEEM and LEED with the chemical/magnetic sensitivity of XPEEM. , The lateral resolution was around 10 nm in LEEM mode and 30 nm in XPEEM. , The energy resolution in photoemission experiments was about 0.15 eV.…”

Section: Methodsmentioning

confidence: 99%

Thermally Induced Chemical and Structural Transformations in Thin Cobalt Films

Jugovac,

Cojocariu,

Genuzio

et al. 2024

ACS Appl. Electron. Mater.

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The effect of annealing and cooling on the structural properties of thin cobalt films possessing either hcp(0001) or fcc(100) crystalline arrangement is studied on clean and carbonreconstructed W(110), respectively. The films grown on a clean W(110) crystal present a surface with hexagonal symmetry and undergo the well-known hcp−fcc structural transition upon annealing to temperatures higher than 700 K, while after cooling down to room temperature, the film is characterized by a laterally heterogeneous morphology featuring different stacking configurations. On carbide-covered W(110), Co grows, instead, in an fcc(100) arrangement with a high level of disorder, for which annealing leads to an improved crystalline order. Further annealing to above 900 K induces an irreversible transition from fcc(100) to hcp(0001) stacking via domain nucleation and growth on a micrometer scale. This recrystallization process is accompanied by a change in the film's chemical composition and magnetic structure. The excess carbon resulting from recrystallization leads to the growth of micrometer-sized graphene islands on top of the hcp regions.

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Section: Methodsmentioning

confidence: 99%

Thermally Induced Chemical and Structural Transformations in Thin Cobalt Films

Jugovac,

Cojocariu,

Genuzio

et al. 2024

ACS Appl. Electron. Mater.

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“…The experiments have been performed using a spin-polarized electron microscope (SPLEEM 28 ) of the National Center for Electron Microscopy, part of the Molecular Foundry in the Lawrence Berkeley National Laboratory. This instrument 29 allows acquisition of low-energy electron images with magnetic contrast using a spin-polarized electron beam for illumination, whose spin orientation can be selected along any desired direction.…”

Section: Experimental Methodsmentioning

confidence: 99%

Stacking influence on the in-plane magnetic anisotropy in a 2D magnetic system

Ruiz-Gómez¹,

Pérez

Mascaraque

et al. 2023

Nanoscale

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“…We employed XPEEM to probe the surface chemistry and electronic structure of the samples at the nanoscale. XPEEM is strongly surface-selective.…”

Section: Methodsmentioning

confidence: 99%

Enhancement of the Solar Water Splitting Efficiency Mediated by Surface Segregation in Ti-Doped Hematite Nanorods

Stanescu

Alun

Dappe

et al. 2023

ACS Appl. Mater. Interfaces

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Band engineering is employed thoroughly and targets technologically scalable photoanodes for solar water splitting applications. Complex and costly recipes are necessary, often for average performances. Here, we report simple photoanode growth and thermal annealing with effective band engineering results. By comparing Ti-doped hematite photoanodes annealed under nitrogen to photoanodes annealed in air, we found a strongly enhanced photocurrent of more than 200% in the first case. Using electrochemical impedance spectroscopy and synchrotron X-ray spectromicroscopy, we demonstrate that oxidized surface states and increased density of charge carriers are responsible for the enhanced photoelectrochemical (PEC) activity. Surface states are found to be related to the formation of pseudo-brookite clusters by surface Ti segregation. Spectro-ptychography is used for the first time at the Ti L3 absorption edge to isolate Ti chemical coordination arising from pseudo-brookite cluster contribution. Correlated with electron microscopy investigation and density functional theory calculations, the synchrotron spectromicroscopy data unambiguously prove the origin of enhanced PEC activity of N2-annealed Ti-doped hematite nanorods. Finally, we present here a handy and cheap surface engineering method beyond the known oxygen vacancy doping, allowing a net gain in the PEC activity for the hematite-based photoanodes.

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Instrumentation

Cited by 3 publications

References 254 publications

Thermally Induced Chemical and Structural Transformations in Thin Cobalt Films

Thermally Induced Chemical and Structural Transformations in Thin Cobalt Films

Stacking influence on the in-plane magnetic anisotropy in a 2D magnetic system

Enhancement of the Solar Water Splitting Efficiency Mediated by Surface Segregation in Ti-Doped Hematite Nanorods

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