Achieve atomic resolution in in situ S/TEM experiments to examine complex interface structures in nanomaterials

Jinschek, Joerg R.

doi:10.1016/j.cossms.2016.05.010

Cited by 17 publications

(12 citation statements)

References 176 publications

(259 reference statements)

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“…Lately, environmental transmission electron microscopy (E-TEM) has become a decisive tool for understanding the chemical activity of catalysts. − Recent developments made it possible to achieve atomic resolution in environmental conditions, , both in a dedicated E-TEM , and in an environmental cell . Environmental electron microscopy has been combined with electron tomography (ET), − enabling the 3D study of materials under specific conditions through the development of fast ET. , This last technique allows the reconstruction of the sample volume using tilt images recorded in 2–4 min with fast step-by-step tilting electron tomography (SBSET) or in several seconds with continuous rotation and recording electron tomography. , …”

Section: Introductionmentioning

confidence: 99%

Migration and Growth of Silver Nanoparticles in Zeolite Socony Mobil 5 (ZSM-5) Observed by Environmental Electron Microscopy: Implications for Heterogeneous Catalysis

Monpezat

Topin

Thomas

et al. 2019

ACS Appl. Nano Mater.

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Silver metal nanoparticles are among the most widely studied nanoparticles. They are widely used heterogeneous catalysts used for many purposes such as antisepsis, hydrogenation, and carboxylation but also for the trapping of xenon in nuclear test and detection facilities. The catalytic activity and adsorption capacity of silver nanoparticles, which depend on their size distribution and dispersion on the support, generally decrease with time because of agglomeration of the metal into larger particles. In this study, we quantified the sintering process of silver nanoparticles supported in Zeolite Socony Mobil 5 (ZSM-5) zeolite. It was found that 85% of the sintering process of the silver nanoparticles was driven by Ostwald ripening. We found that silver nanoparticles are trapped in porous cavities that are meso- or macroporous defects in the zeolite. Although this phenomenon limits the amount of silver that diffuses to the zeolite external surface, it does not prevent the formation of large particles by atom migration. The presence of chloride reactants facilitates the sintering phenomenon by lowering the energy barrier. This finding provides a rational basis for the design of silver-containing zeolite-based heterogeneous catalysts.

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Section: Introductionmentioning

confidence: 99%

Migration and Growth of Silver Nanoparticles in Zeolite Socony Mobil 5 (ZSM-5) Observed by Environmental Electron Microscopy: Implications for Heterogeneous Catalysis

Monpezat

Topin

Thomas

et al. 2019

ACS Appl. Nano Mater.

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“…In this context, it is of great importance to revisit the local molecular-level surface structures of such small sized materials in comparison to those of the macroscopic ones. A series of characterization techniques, including attenuated total reflection infrared spectroscopy (ATR-IR), surface enhanced Raman scattering (SERS), X-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), etc. − have been used to characterize such mesoscopic materials to obtain structural information like surface species, surface compositions, and surface morphologies, etc. Each characterization technique has its own advantage(s) over others.…”

Section: Introductionmentioning

confidence: 99%

Sum Frequency Generation Vibrational Spectroscopy Using Evanescent Waves—Toward Probing Irregular and Complex Surfaces of Mesoscopic-Scale Materials

Chen

et al. 2018

Anal. Chem.

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With the rapid development of materials science, on-demand techniques are highly needed with the capability to characterize materials in the micrometer and nanometer scales. In this work, we show that, by employing a prism geometry, total internal reflection sum frequency generation (SFG) vibrational spectroscopy allows for characterizing mesoscopic materials with irregular or complex surfaces. Four representative examples were presented. First, we reveal that mechanical grinding can subtly alter the surface molecular structures of original materials. Second, spin coating can substantially change the surface molecular structures of particle samples. Third, surface restructuring of carboxylated multiwalled carbon nanotubes can happen in response to the surrounding environment. Fourth, surface adsorption and desorption dynamics of toluene on activated charcoal can be traced. Such experiments demonstrate that there are still a broad range of research fields ahead SFG can be directed to, where materials in mesoscopic scales with irregular or complex surfaces can be studied.

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“…While a strong development toward environmental TEM has occurred since the 70s, , detection capabilities did not allow routine atomic resolution under controlled atmosphere. With the advent of aberration-correction and high speed cameras in the past decade, HRTEM imaging has become a key technique to allow atomic-scale analysis in real time in environmental conditions. − …”

mentioning

confidence: 99%

Direct Visualization and Control of Atomic Mobility at {100} Surfaces of Ceria in the Environmental Transmission Electron Microscope

Bugnet

Overbury

et al. 2017

Nano Lett.

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Ceria is one of the world's most prominent material for applications in heterogeneous catalysis, as catalyst support or catalyst itself. Despite an exhaustive literature on the structure of reactive facets of CeO in line with its catalytic mechanisms, the temporal evolution of the atomic surface structure exposed to realistic redox conditions remains elusive. Here, we provide a direct visualization of the atomic mobility of cerium atoms on {100} surfaces of CeO nanocubes at room temperature in high vacuum, O, and CO atmospheres in an environmental transmission electron microscope. Through quantification of the cationic mobility, we demonstrate the control of the surface dynamics under exposure to O and CO atmospheres, providing opportunities for a better understanding of the intimate catalytic mechanisms.

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Achieve atomic resolution in in situ S/TEM experiments to examine complex interface structures in nanomaterials

Cited by 17 publications

References 176 publications

Migration and Growth of Silver Nanoparticles in Zeolite Socony Mobil 5 (ZSM-5) Observed by Environmental Electron Microscopy: Implications for Heterogeneous Catalysis

Migration and Growth of Silver Nanoparticles in Zeolite Socony Mobil 5 (ZSM-5) Observed by Environmental Electron Microscopy: Implications for Heterogeneous Catalysis

Sum Frequency Generation Vibrational Spectroscopy Using Evanescent Waves—Toward Probing Irregular and Complex Surfaces of Mesoscopic-Scale Materials

Direct Visualization and Control of Atomic Mobility at {100} Surfaces of Ceria in the Environmental Transmission Electron Microscope

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