<i>In Situ</i> High-Resolution Transmission Electron Microscopy in the Study of Nanomaterials and Properties

Howe, James M.; Mori, Hirotarô; Wang, Zhong Lin

doi:10.1557/mrs2008.24

Cited by 22 publications

(11 citation statements)

References 30 publications

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“…The requirement that samples be strong electron scatters has meant that most studies have examined dynamic processes in larger (>10 nm) nanoscale particles of inorganic materials. ( 115 ) However, some measurements are approaching the resolution and sensitivity necessary for single-molecule experiments. For instance, tumbling motions of single La atoms confined within La 2 @C 80 −carbon nanotube peapod assemblies have been observed.…”

Section: Electron-based Measurementsmentioning

confidence: 99%

“…Optical trapping has led to a natural overlap between optical and force-based measurements of forces as they relate to motion on the nanoscale in biological systems. Recently, AFM measurements have also been combined with both STM( 338 ) and TEM,( 115 ) opening the possibility of direct, label-free measurement of subnanometer structural changes in response to force. The ability to perform optical and electronic single-molecule measurements simultaneously could help bridge the native length scales of each experiment.…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

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Electrons, Photons, and Force: Quantitative Single-Molecule Measurements from Physics to Biology

2011

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Single-molecule measurement techniques have illuminated unprecedented details of chemical behavior, including observations of the motion of a single molecule on a surface, and even the vibration of a single bond within a molecule. Such measurements are critical to our understanding of entities ranging from single atoms to the most complex protein assemblies. We provide an overview of the strikingly diverse classes of measurements that can be used to quantify single-molecule properties, including those of single macromolecules and single molecular assemblies, and discuss the quantitative insights they provide. Examples are drawn from across the single-molecule literature, ranging from ultrahigh vacuum scanning tunneling microscopy studies of adsorbate diffusion on surfaces to fluorescence studies of protein conformational changes in solution.

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Section: Electron-based Measurementsmentioning

confidence: 99%

Section: Conclusion and Prospectsmentioning

confidence: 99%

Electrons, Photons, and Force: Quantitative Single-Molecule Measurements from Physics to Biology

2011

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“…In situ TEM is a direct approach for simultaneously revealing the structure and the corresponding physical/chemical process as it is occurring. The traditional in situ TEM is about a temperature driven structural changing process, such as phase transformation, crystal growth, mass diffusion [39] and surface reaction [40]. In situ TEM has largely been expanded to the area of physical Fig.…”

Section: Nanoscale In Situ Measurementsmentioning

confidence: 99%

Picoscale science and nanoscale engineering by electron microscopy

Wang

2011

Microscopy

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A future scanning/transmission electron microscope is proposed to be a comprehensive machine that is capable of providing picoseconds time-resolved information at sub-nanometer scale and even at picometer scale, spatial resolution. At the same time, physical and chemical properties can be measured in situ from a region as small as a few nanometers by introducing local electric, mechanical, thermal, magnetic and/or optical stimulations/excitations under vacuum or even in a quasi-ambient environment. It is anticipated that nanoscopy and picoscopy will be key tools for studying picoscale science and developing nanoscale technology related to materials science, biology, physics and chemistry.

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“…[4][5][6] However, conventional TEM-based in situ studies typically offer temporal resolution in the millisecond range, which is insufficient for investigations of RS process dynamics. 5,7,8 The dynamic transmission electron microscope (DTEM), a TEM modified by two complex laser systems, offers nano-scale spatiotemporal resolution, rendering it uniquely suited for studies of irreversible transitions in materials, including those associated with RS transformations. [8][9][10][11][12][13][14][15][16] The DTEM uses intense electron pulses of durations as short as 15 ns for the acquisition of images or diffraction patterns.…”

Section: Introductionmentioning

confidence: 99%

Determination of crystal growth rates during rapid solidification of polycrystalline aluminum by nano-scale spatio-temporal resolution in situ transmission electron microscopy

Zweiacker

McKeown

Liu

et al. 2016

Journal of Applied Physics

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In situ investigations of rapid solidification in polycrystalline Al thin films were conducted using nano-scale spatio-temporal resolution dynamic transmission electron microscopy. Differences in crystal growth rates and asymmetries in melt pool development were observed as the heat extraction geometry was varied by controlling the proximity of the laser-pulse irradiation and the associated induced melt pools to the edge of the transmission electron microscopy support grid, which acts as a large heat sink. Experimental parameters have been established to maximize the reproducibility of the material response to the laser-pulse-related heating and to ensure that observations of the dynamical behavior of the metal are free from artifacts, leading to accurate interpretations and quantifiable measurements with improved precision. Interface migration rate measurements revealed solidification velocities that increased consistently from ∼1.3 m s−1 to ∼2.5 m s−1 during the rapid solidification process of the Al thin films. Under the influence of an additional large heat sink, increased crystal growth rates as high as 3.3 m s−1 have been measured. The in situ experiments also provided evidence for development of a partially melted, two-phase region prior to the onset of rapid solidification facilitated crystal growth. Using the experimental observations and associated measurements as benchmarks, finite-element modeling based calculations of the melt pool evolution after pulsed laser irradiation have been performed to obtain estimates of the temperature evolution in the thin films.

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In Situ High-Resolution Transmission Electron Microscopy in the Study of Nanomaterials and Properties

Cited by 22 publications

References 30 publications

Electrons, Photons, and Force: Quantitative Single-Molecule Measurements from Physics to Biology

Electrons, Photons, and Force: Quantitative Single-Molecule Measurements from Physics to Biology

Picoscale science and nanoscale engineering by electron microscopy

Determination of crystal growth rates during rapid solidification of polycrystalline aluminum by nano-scale spatio-temporal resolution in situ transmission electron microscopy

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