Confocal Microscope Alignment of Nanocrystals for Coherent Diffraction Imaging

Beitra, Loren; Watari, Moyu; Mizutani, Takashi; Shimamoto, Norio; Harder, Ross; Robinson, Ian; Garrett, R. F.; Gentle, Ian R.; Nugent, K. A.; Wilkins, S. W.

doi:10.1063/1.3463273

Cited by 12 publications

(11 citation statements)

References 3 publications

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“…The irradiation behavior was reproducible and observed repeatedly on fresh wires [20]. It could be prevented by maintaining the sample in an inert He atmosphere, hence it was attributed to beam-induced oxidation of the substrate [20].…”

Section: Methodsmentioning

confidence: 76%

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Mechanical breakdown of bent silicon nanowires imaged by coherent x-ray diffraction

et al. 2013

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We have developed a method of coherent x-ray diffractive imaging to surmount its inability to image the structure of strongly strained crystals. We used calculated models from finite-element analysis to guide an iterative algorithm to fit experimental data from a series of increasingly bent wires cut into silicon-on-insulator films. Just before mechanical fracture, the wires were found to contain new phase structures, which are identified as dislocations associated with crossing the elastic limit.

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Section: Methodsmentioning

confidence: 76%

“…A confocal microscope [20] was used to pinpoint the specific nanowire structures to be measured. Off-specular (111) reflections of Si nanowires were chosen for CDI measurements and the incidence angle on the substrate was fixed to be 1 • .…”

Section: Methodsmentioning

confidence: 99%

Mechanical breakdown of bent silicon nanowires imaged by coherent x-ray diffraction

et al. 2013

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“…The missing Bragg electron density in the reconstructed strain fields can occur in several ways. If a portion of the crystal rotates out of the Bragg condition, becomes amorphous, or undergoes restructuring to a different unit cell symmetry, this appears as missing Bragg electron density 31 35 54 . The most plausible explanation is that the β phase region nucleates at the corner of the cube and propagates inward, which is consistent with the location of the β phase region observed in the phase-field model ( Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Avalanching strain dynamics during the hydriding phase transformation in individual palladium nanoparticles

et al. 2015

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Phase transitions in reactive environments are crucially important in energy and information storage, catalysis and sensors. Nanostructuring active particles can yield faster charging/discharging kinetics, increased lifespan and record catalytic activities. However, establishing the causal link between structure and function is challenging for nanoparticles, as ensemble measurements convolve intrinsic single-particle properties with sample diversity. Here we study the hydriding phase transformation in individual palladium nanocubes in situ using coherent X-ray diffractive imaging. The phase transformation dynamics, which involve the nucleation and propagation of a hydrogen-rich region, are dependent on absolute time (aging) and involve intermittent dynamics (avalanching). A hydrogen-rich surface layer dominates the crystal strain in the hydrogen-poor phase, while strain inversion occurs at the cube corners in the hydrogen-rich phase. A three-dimensional phase-field model is used to interpret the experimental results. Our experimental and theoretical approach provides a general framework for designing and optimizing phase transformations for single nanocrystals in reactive environments.

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“…The 34-ID-C beamline at Argonne has an integral confocal optical microscope used for 3D alignment of the sample in the beam [23]. This microscope was used to capture the confocal image in figure 3 immediately after the dosing series.…”

Section: Results Of Experimental Measurementsmentioning

confidence: 99%

Radiation-induced bending of silicon-on-insulator nanowires probed by coherent x-ray diffractive imaging

et al. 2012

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Confocal Microscope Alignment of Nanocrystals for Coherent Diffraction Imaging

Cited by 12 publications

References 3 publications

Mechanical breakdown of bent silicon nanowires imaged by coherent x-ray diffraction

Mechanical breakdown of bent silicon nanowires imaged by coherent x-ray diffraction

Avalanching strain dynamics during the hydriding phase transformation in individual palladium nanoparticles

Radiation-induced bending of silicon-on-insulator nanowires probed by coherent x-ray diffractive imaging

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