The development of a 200kV monochromated field emission electron source

Mukai, Masakazu; Kim, Judy; Omoto, Kazuya; Sawada, Hidetaka; Kimura, Atsushi; Ikeda, Akihiro; Zhou, Jun; Kaneyama, T.; Young, Neil P.; Warner, Jamie H.; Nellist, Peter D.; Kirkland, Angus I.

doi:10.1016/j.ultramic.2014.02.004

Cited by 44 publications

(24 citation statements)

References 25 publications

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“…To perform heating experiments, mono-layer graphene was transferred to commercially available chips (DENS-C-SH30), incorporating a platinum heating coil 18 in which slits of 0.2 Â 1 lm had been drilled using a focused ion beam. Selected area diffraction patterns were recorded using a monochromated dual aberration corrected JEOL-2200 MCO TEM, 19 operating at 80 kV with an electron beam energy spread of $380 meV. To perform in-situ heating experiments, a SH30-4M-FS (DENS solutions) TEM sample holder was used.…”

Section: Methodsmentioning

confidence: 99%

Temperature dependence of atomic vibrations in mono-layer graphene

Allen

Liberti

Kim

et al. 2015

Journal of Applied Physics

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We have measured the mean square amplitude of both in-and out-of-plane lattice vibrations for mono-layer graphene at temperatures ranging from $100 K to 1300 K. The amplitude of lattice vibrations was calculated from data extracted from selected area electron diffraction patterns recorded across a known temperature range with over 80 diffraction peaks measured per diffraction pattern. Using an analytical Debye model, we have also determined values for the maximum phonon wavelength that can be supported by a mono-layer graphene crystal and the magnitude of quantum mechanical zero point vibrations. For in-plane phonons, the quantum mechanical zero point contribution dominates the measured atomic displacement at room temperature, whereas for out-of-plane modes, thermally populated phonons must be considered. We find a value for the maximum phonon wavelength sampled that is several orders of magnitudes smaller than the physical crystallite size. V C 2015 AIP Publishing LLC. [http://dx

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Section: Methodsmentioning

confidence: 99%

Temperature dependence of atomic vibrations in mono-layer graphene

Allen

Liberti

Kim

et al. 2015

Journal of Applied Physics

Self Cite

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“…However, recent progress in a chromatic aberration correctors (C c o 10 μm) [30,32] and electron source monochromators (ΔEo30 meV) [33,34] means that the focus spread along the depth can be sufficiently reduced that d c should approach the Ångstrom level. Therefore, in the following, we assume a perfectly monochromated and geometric-aberration-free electron source and study the impact of just the illumination angle α on the depth of field.…”

Section: Chromatic Aberration and The Depth Of Fieldmentioning

confidence: 99%

Large-angle illumination STEM: Toward three-dimensional atom-by-atom imaging

et al. 2015

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To fully understand and control materials and their properties, it is of critical importance to determine their atomic structures in all three dimensions. Recent revolutionary advances in electron optics - the inventions of geometric and chromatic aberration correctors as well as electron source monochromators - have provided fertile ground for performing optical depth sectioning at atomic-scale dimensions. In this study we theoretically demonstrate the imaging of top/sub-surface atomic structures and identify the depth of single dopants, single vacancies and the other point defects within materials by large-angle illumination scanning transmission electron microscopy (LAI-STEM). The proposed method also allows us to measure specimen properties such as thickness or three-dimensional surface morphology using observations from a single crystallographic orientation.

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“…Due to recent advancements in transmission electron microscope (TEM) electron source monochromation [15][16][17], an EEL spectrometer coupled to a TEM column now allows for detailed investigations of π → π * transitions between the SWCNT conduction and valence VHSs [18,19]. Moreover, TEM and scanning (S) TEM allow for the determination of the chiral indices of each investigated tube using either a Fourier transform (FFT) of a high-resolution image [19,20] or an electron diffraction pattern [18,21,22].…”

Section: Introductionmentioning

confidence: 99%

Momentum- and space-resolved high-resolution electron energy loss spectroscopy of individual single-wall carbon nanotubes

et al. 2017

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The ability to probe the electronic structure of individual nano-objects at high energy resolution using momentum-and space-resolved electron energy loss spectroscopy in the scanning transmission electron microscope is demonstrated through the observation of confinement of the π plasmon in individual single-wall carbon nanotubes. While confinement perpendicular to the tube axis was identified for all investigated tubes, a variable degree of confinement parallel to the tube axis was attributed to the concentration of topological defects. Spatially resolved valence loss spectra allowed for the identification of a loss peak attributed to a chirality-dependent radial interband transition. Furthermore, the importance of a careful consideration of loss peak momentum dispersions for the interpretation of spatially resolved valence loss spectra is discussed.

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The development of a 200kV monochromated field emission electron source

Cited by 44 publications

References 25 publications

Temperature dependence of atomic vibrations in mono-layer graphene

Temperature dependence of atomic vibrations in mono-layer graphene

Large-angle illumination STEM: Toward three-dimensional atom-by-atom imaging

Momentum- and space-resolved high-resolution electron energy loss spectroscopy of individual single-wall carbon nanotubes

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