Atomically resolved mapping of EELS fine structures

Gloter, Alexandre; Badjeck, Vincent; Bocher, Laura; Brun, Nathalie; March, Katia; Marinova, Maya; Tencé, Marcel; Walls, Michael; Zobelli, Alberto; Stéphan, Odile; Colliex, C.

doi:10.1016/j.mssp.2016.07.006

Cited by 39 publications

(24 citation statements)

References 67 publications

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“…As the energy-loss near-edge fine structures (ELNES) are sensitive to the oxidation state and to the bonding and local environment, it is not only possible to determine the chemical composition of the doped TiO 2 samples, but also to sort out spectral signatures of the copper oxidation state and to locally identify the TiO 2 crystalline phase (anatase vs rutile) in the studied samples. Chemical analyses were performed by EELS in the spectrum-imaging mode, in which the focused beam is scanned over a region of interest and a whole spectrum is acquired at each position of the scan [44,45]. Such a spectrum-image contains typically 10000 spectra.…”

Section: Nanoscale Analysismentioning

confidence: 99%

Radiocatalytic Cu-incorporated TiO2 nano-particles for the degradation of organic species under gamma irradiation

Samet

March

Stéphan

et al. 2018

Journal of Alloys and Compounds

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We report on an experimental study aimed at optimizing the radiocatalytic properties of pure and copper-incorporated TiO 2 powders. This has been achieved by conducting crosschecked structural, optical and radiocatalytic studies. Structural and nanoscale analyses show evidence of internal doping by Cu 2+ in the TiO 2 lattice that leads to the reduction of the optical band gap down to 1.5 eV. The effect of gamma radiation on the radiocatalytic activity of these catalysts was studied by degradation of methylene blue as a model pollutant. It was found that the addition of Cu-doped TiO 2 (anatase) powders improves significantly the pollutant degradation, as compared to photocatalysis. The doping and the annealing temperature's impact on the structural, optical and radiocatalytic efficiencies are highlighted and correlated.

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Section: Nanoscale Analysismentioning

confidence: 99%

Radiocatalytic Cu-incorporated TiO2 nano-particles for the degradation of organic species under gamma irradiation

Samet

March

Stéphan

et al. 2018

Journal of Alloys and Compounds

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“…The dopant solubility and charge compensation have therefore been investigated for both B(Ca 0.0 Y 0.5 )IG and B(Ca 0.3 Y 0.2 )IG by advanced spectromicroscopy techniques. Aberration‐corrected (Cs) STEM/EELS, can probe core‐loss absorption edges down to the atomic scale and is thus well suited to mapping the dopant distribution in the garnet lattice . At higher energy resolution, the local charge variations can be derived through the analysis of the spectral fine structures.…”

Section: Resultsmentioning

confidence: 99%

Atmosphere‐Induced Reversible Resistivity Changes in Ca/Y‐Doped Bismuth Iron Garnet Thin Films

Teurtrie

Popova

Koita

et al. 2019

Adv Funct Materials

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Bismuth iron garnet Bi3Fe5O12 (BIG) is a multifunctional insulating oxide exhibiting remarkably the largest known Faraday rotation and linear magnetoelectric coupling. Enhancing the electrical conductivity in BIG while preserving its magnetic properties would further widen its range of potential applications in oxitronic devices. Here, a site‐selective codoping strategy in which Ca2+ and Y3+ substitute for Bi3+ is applied. The resulting p‐ and n‐type doped BIG films combine state‐of‐the‐art magneto‐optical properties and semiconducting behaviors above room temperature with rather low resistivity: 40 Ω cm at 450 K is achieved in an n‐type Y‐doped BIG; this is ten orders of magnitude lower than that of Y3Fe5O12. High‐resolution electron spectromicroscopy unveils the complete dopant solubility and the charge compensation mechanisms at the local scale in p‐ and n‐type systems. Oxygen vacancies as intrinsic donors play a key role in the conduction mechanisms of these doped BIG films. On the other hand, a self‐compensation of Ca2+ with oxygen vacancies tends to limit the conduction in p‐type Ca/Y‐doped BIG. These results highlight the possibility of integrating n‐type and p‐type doped BIG films in spintronic structures as well as their potential use in gas sensing applications.

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“…Conversely, the resolution offered by the DD sensor remains close to the value of ∆E 0 for a much broader range of energy FOV. Overlaid on the data are various EELS applications positioned along the y -axis according to their required energy resolution 41 . The shaded areas between the ID and DD curves represent values of combined energy resolution and FOV available with DD but not accessible with the ID sensor.…”

Section: Resultsmentioning

confidence: 99%

Direct Detection Electron Energy-Loss Spectroscopy: A Method to Push the Limits of Resolution and Sensitivity

Hart

Lang

Leff

et al. 2017

Sci Rep

125

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In many cases, electron counting with direct detection sensors offers improved resolution, lower noise, and higher pixel density compared to conventional, indirect detection sensors for electron microscopy applications. Direct detection technology has previously been utilized, with great success, for imaging and diffraction, but potential advantages for spectroscopy remain unexplored. Here we compare the performance of a direct detection sensor operated in counting mode and an indirect detection sensor (scintillator/fiber-optic/CCD) for electron energy-loss spectroscopy. Clear improvements in measured detective quantum efficiency and combined energy resolution/energy field-of-view are offered by counting mode direct detection, showing promise for efficient spectrum imaging, low-dose mapping of beam-sensitive specimens, trace element analysis, and time-resolved spectroscopy. Despite the limited counting rate imposed by the readout electronics, we show that both core-loss and low-loss spectral acquisition are practical. These developments will benefit biologists, chemists, physicists, and materials scientists alike.

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Atomically resolved mapping of EELS fine structures

Cited by 39 publications

References 67 publications

Radiocatalytic Cu-incorporated TiO2 nano-particles for the degradation of organic species under gamma irradiation

Radiocatalytic Cu-incorporated TiO2 nano-particles for the degradation of organic species under gamma irradiation

Atmosphere‐Induced Reversible Resistivity Changes in Ca/Y‐Doped Bismuth Iron Garnet Thin Films

Direct Detection Electron Energy-Loss Spectroscopy: A Method to Push the Limits of Resolution and Sensitivity

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