Direct Observation of Sample Dynamics in the Gaseous Environment: A Perspective on Current Trends and Future Directions of <i>In Situ</i> Gas Cell Transmission Electron Microscopy

De Alwis Goonatilleke, Manisha; Thomas, Melonie P.; Ullah, Ahamed; Pham, Rose H.; Guiton, Beth S.

doi:10.1021/acs.jpcc.3c03759

Cited by 7 publications

(2 citation statements)

References 86 publications

(166 reference statements)

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“…We believe that the types of observation shown here offer exciting opportunities if combined with quantification at a statistical level to explore the dynamics of a large population of supported nanoparticles obtained from combined 2D and 3D imaging. Approaches such as deep learning − would sample a larger range of individual particle behaviors and yield more quantitative statistical conclusions. Future studies could calculate in advance the optimal area to image in STEM to balance dose, image quality and number of particles acquired, and minimize dose and acquisition time with advanced scan techniques yielding quantitative results beyond the more qualitative outcomes reported here.…”

Section: Discussionmentioning

confidence: 99%

Simultaneous 2D Projection and 3D Topographic Imaging of Gas-Dependent Dynamics of Catalytic Nanoparticles

Lee,

Gadelrab,

Cheng

et al. 2024

ACS Nano

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Catalyst deactivation through pathways such as sintering of nanoparticles and degradation of the support is a critical factor when designing high-performance catalysts. Here, structural changes of supported nanoparticle catalysts are investigated in controlled gas environments (O 2 , H 2 O, and H 2 ) at different temperatures by imaging simultaneously the nanoparticle structures in 2D projection and the 3D surface-sensitive topography. Platinum nanoparticles on carbon support as a model system are imaged in an environmental transmission electron microscope (ETEM), with concurrent acquisition of high-angle annular dark field scanning TEM (HAADF-STEM) and secondary electron (SE) images. Particle migration and coalescence occurs and shows gas-dependent kinetics, with nanoparticles moving across and through the support during and after coalescence. The temperature required for motion is lower in O 2 than in H 2 O and H 2 , explained through the nature of the gas/nanoparticle interactions. In O 2 and H 2 , the carbon support degrades by trench formation along migration pathways, and the particles move continuously, indicating a chemical reaction between gas and support. In H 2 O gas, motion is more discontinuous and oriented particle attachment occurs, as expected from theoretical predictions. These results suggest that multimodal imaging in ETEM that combines HAADF-STEM and SE data provides comprehensive information regarding catalyst dynamics and degradation mechanisms.

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Section: Discussionmentioning

confidence: 99%

Simultaneous 2D Projection and 3D Topographic Imaging of Gas-Dependent Dynamics of Catalytic Nanoparticles

Lee,

Gadelrab,

Cheng

et al. 2024

ACS Nano

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show abstract

“…Hariharan and co-workers describe the design of the crystallization structure for organic semiconductors, which can be tuned for charge transport through π-conjugated molecules . Guiton and co-workers describe the use of environmental transmission electron microscopy to study the dynamic restructuring of nanostructures at the solid–gas interface . Nanomechanical resonators for photothermal microscopy and spectroscopy have promise for single particle, and even single molecule detection, as described by West et al, but require a slight vacuum since it works by measuring the release of heat .…”

mentioning

confidence: 99%

Perspective, Review, and Featured Articles of 2023

Price,

Hartland

2024

J. Phys. Chem. C

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In situ Tracking the Constrained Reconstruction of Cu₃Pd@SiO₂ Nanoparticles Driven by Redox Atmospheres

Xu,

Zhao,

Han

et al. 2024

ChemCatChem

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Endowed with flexible surface coordination and synergetic electronic status, bimetallic particles serve as promising heterogeneous catalysts as their microstructures evolved sensitively to the treatment atmospheres, whereas knowledge of dynamic manners is less. Herein, utilizing environmental transmission electron microscopy (ETEM), the reconstructions of Cu3Pd particles in oxidation/reduction atmospheres were explored at atomic scale. Specifically, bare Cu3Pd particles went through a phase separation of CuO and PdO during in situ oxidation, and subsequent agglomeration after H2 reduction. While protected in a silica shell, the confined Cu3Pd particles were oxidized into Cu1.5Pd0.5O2 phase after air calcination and subsequently restructured into versatile configurations during reduction. Specifically, hollow Cu3Pd alloy architecture with Pd enriched layer near surface as reduced at 200 oC. Further rising 400 to 600 oC, it yielded disordered Cu3Pd alloys with slightly Pd atoms enrichment at outmost surface. The dynamical behaviors of single Cu1.5Pd0.5O2 particle during in situ reduction have been visualized in ETEM, wherein a series of deformation, elongation and rotation is involved during the hollow architecture firstly formation, and then vanished into a Cu3Pd solid solution nanoparticle. The tunable microstructures of Cu3Pd@SiO2 driven by redox atmospheres demonstrate efficient approach for precisely regulating the chemical environments of constrained bimetallic nanocatalysts.

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Direct Observation of Sample Dynamics in the Gaseous Environment: A Perspective on Current Trends and Future Directions of In Situ Gas Cell Transmission Electron Microscopy

Cited by 7 publications

References 86 publications

Simultaneous 2D Projection and 3D Topographic Imaging of Gas-Dependent Dynamics of Catalytic Nanoparticles

Simultaneous 2D Projection and 3D Topographic Imaging of Gas-Dependent Dynamics of Catalytic Nanoparticles

Perspective, Review, and Featured Articles of 2023

In situ Tracking the Constrained Reconstruction of Cu₃Pd@SiO₂ Nanoparticles Driven by Redox Atmospheres

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Direct Observation of Sample Dynamics in the Gaseous Environment: A Perspective on Current Trends and Future Directions of In Situ Gas Cell Transmission Electron Microscopy

Cited by 7 publications

References 86 publications

Simultaneous 2D Projection and 3D Topographic Imaging of Gas-Dependent Dynamics of Catalytic Nanoparticles

Simultaneous 2D Projection and 3D Topographic Imaging of Gas-Dependent Dynamics of Catalytic Nanoparticles

Perspective, Review, and Featured Articles of 2023

In situ Tracking the Constrained Reconstruction of Cu3Pd@SiO2 Nanoparticles Driven by Redox Atmospheres

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In situ Tracking the Constrained Reconstruction of Cu₃Pd@SiO₂ Nanoparticles Driven by Redox Atmospheres