<i>In situ</i> probing of helium desorption from individual nanobubbles under electron irradiation

David, Marie‐Laure; Pailloux, F.; Mauchamp, Vincent; Pizzagalli, Laurent

doi:10.1063/1.3582612

Cited by 36 publications

(63 citation statements)

References 22 publications

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“…Although there have been many studies dedicated on NG atoms behavior in metals [4] or in silicon [5][6][7], the literature is much more scarce for SiC. The pioneering works of Hojou and co-workers [8,9] and of Jung and co-workers [10][11][12] revealed the formation of He-filled bubbles and platelets in SiC depending on the conditions.…”

Section: Introductionmentioning

confidence: 99%

First principles calculation of noble gas atoms properties in 3C–SiC

Eddin

Pizzagalli

2012

Journal of Nuclear Materials

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First-principles calculations were performed to investigate the properties of single noble gas atoms (He, Ne, Ar, Kr, Xe) in 3C-SiC. Three cases were considered: (i) a noble gas atom in a perfect crystal, (ii) in the neighborhood of a monovacancy, (iii) and of a divacancy. For each case the stable configurations were determined, as well as their formation energies. The mobility of He, Ne and Ar interstitials was studied, and the associated migration energies were calculated. Our results were discussed and compared to available experimental or theoretical works.

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Section: Introductionmentioning

confidence: 99%

First principles calculation of noble gas atoms properties in 3C–SiC

Eddin

Pizzagalli

2012

Journal of Nuclear Materials

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“…Adsorption materials, which are another option for storage and transportation of He gas, share a similar problem: the polarizability of He is so low that there is little He adsorption at all. On the one hand, this weakness of interaction of He with various metals/materials is exploited because of its inertness and low solubility in various materials, reference states can be marked [20][21][22][23][24][25] . On the other hand, He adsorption materials would therefore enable new technologies and are hence in high demand.…”

mentioning

confidence: 99%

On the Possibility of Helium Adsorption in Nitrogen Doped Graphitic Materials

Sahoo

Heske

Azadi

et al. 2020

Sci Rep

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the potassium salt of polyheptazine imide (K-pHi) is a promising photocatalyst for various chemical reactions. From powder X-ray diffraction data an idealized structural model of K-PHI has been derived. Using atomic coordinates of this model we defined an energetically optimized K-PHI structure, in which the K ions are present in the pore and between the pHi-planes. the distance between the anion framework and K + resembles a frustrated Lewis pair-like structure, which we denote as frustrated coulomb pair that results in an interesting adsorption environment for otherwise non-adsorbing, nonpolar gas molecules. We demonstrate that even helium (He) gas molecules, which are known to have the lowest boiling point and the lowest intermolecular interactions, can be adsorbed in this polarized environment with an adsorption energy of − 4.6 kJ mol −1 per He atom. the interaction between He atoms and K-pHi is partially originating from charge transfer, as disclosed by our energy decomposition analysis based on absolutely localized molecular orbitals. Due to very small charge transfer interactions, He gas adsorption saturates at 8 at%, which however can be subject to further improvement by cation variation.

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“…The parameter ℎ is the local pore (or cavity) thickness crossed by the electron beam, which was determined as the complement to the local thickness measurements of the matrix. 15,26,28 For that purpose, the absolute specimen thickness ‫ݐ‬ was computed by combining the calculations of the relative specimen thickness ‫ߣ/ݐ‬ with the inelastic mean free path ߣ. ‫ߣ/ݐ‬ was determined by the Log-ratio method.…”

Section: Quantification Of Molecular Nitrogen Inside the Poresmentioning

confidence: 99%

“…of nanobubbles or nanopores filled with helium for which quantification has already been achieved in various studies, 15,18,[26][27][28][29] only a few works attempted to evaluate the N 2 density and pressure inside closed cavities. [30][31][32] Most of them were done in a semi-quantitative way based on the variation of the N-K edge intensity over the nitride matrix and over the pore.…”

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confidence: 99%

Nitrogen Nanobubbles in a-SiO_xN_y Coatings: Evaluation of Its Physical Properties and Chemical Bonding State by Spatially Resolved Electron Energy-Loss Spectroscopy

2016

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Nanoporous silicon based materials with closed porosity filled with the sputtering gas have been recently developed by magnetron sputtering. In this work the physical properties (density and pressure) of molecular nitrogen inside closed pores in a SiO x N y coating are investigated for the first time using spatially resolved electron energy-loss spectroscopy (EELS) in a scanning transmission electron microscope. The paper offers a detailed methodology to record and process multiple EELS spectrum images (SIs) acquired at different energy ranges and with different dwell times. It is demonstrated an adequate extraction and quantification of the N-K edge contribution due to the molecular nitrogen inside nanopores. Core-loss intensity and N chemical bond state were evaluated to retrieve 2D maps revealing stable high density of molecular nitrogen (from 40 to 70 at./nm 3 ) in nanopores of different size (20 to 11 nm). This work provides new insights on the quantification of molecular N 2 trapped in porous nitride matrices that could be also applied to other systems.

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In situ probing of helium desorption from individual nanobubbles under electron irradiation

Cited by 36 publications

References 22 publications

First principles calculation of noble gas atoms properties in 3C–SiC

First principles calculation of noble gas atoms properties in 3C–SiC

On the Possibility of Helium Adsorption in Nitrogen Doped Graphitic Materials

Nitrogen Nanobubbles in a-SiO_xN_y Coatings: Evaluation of Its Physical Properties and Chemical Bonding State by Spatially Resolved Electron Energy-Loss Spectroscopy

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In situ probing of helium desorption from individual nanobubbles under electron irradiation

Cited by 36 publications

References 22 publications

First principles calculation of noble gas atoms properties in 3C–SiC

First principles calculation of noble gas atoms properties in 3C–SiC

On the Possibility of Helium Adsorption in Nitrogen Doped Graphitic Materials

Nitrogen Nanobubbles in a-SiOxNy Coatings: Evaluation of Its Physical Properties and Chemical Bonding State by Spatially Resolved Electron Energy-Loss Spectroscopy

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Nitrogen Nanobubbles in a-SiO_xN_y Coatings: Evaluation of Its Physical Properties and Chemical Bonding State by Spatially Resolved Electron Energy-Loss Spectroscopy