High resolution transmission electron microscopy to study very thin crystalline layers buried at an amorphous–crystalline interface

Re, M.; Carlino, Elvio; Sorba, L.; Franciosi, A.; Müller, Bernhard

doi:10.1016/s0968-4328(99)00089-x

Cited by 2 publications

(4 citation statements)

References 21 publications

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“…For instance, if the h-phase is 80 Å thick, then it only consumes an 18 Å thick layer of a-Si. The amorphous part blurs significantly the HRTEM images of the tarnishing crystalline phases [19]. The background intensities in the SAED patterns are clouded by the a-Si as it is shown below in the upper left corner of Fig.…”

Section: Resultsmentioning

confidence: 87%

“…All of our experimental data are combination of signals from the reaction products between the copper grid and the nm thick a-Si layer and the unreacted amorphous silicon layer (a-Si) underneath. We know after Re et al [19] that overlapping an amorphous layer reduces aesthetic quality of both HRTEM images and SAED patterns, however structural data can still be retrieved from these. The thickness measured on SAED patterns (using the formula of Cowley [17]) usually varied in between 60 Å and 80 Å.…”

Section: Resultsmentioning

confidence: 99%

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Low temperature formation of copper rich silicides

2019

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The reactions of copper and amorphous silicon were studied by in-situ transmission electron microscopy up to 500 C. Only the Cu 76 Si 24-h phase and the Cu 82 Si 18-d phase formed at this temperature. The crystal structure of the dominating Cu 76 Si 24 changed, by the elapsed time after heating. The CueSi ordering resulted in different supercells, built up by topologically identical subcells with different site occupancies and arrangement. Two modulated crystal structures were solved based on diffraction data and HRTEM images.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Low temperature formation of copper rich silicides

2019

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“…15,16 If the constrained crystal growth manner could be applied to create 2D flakes of 3D COFs with a thickness of less than 200 nm, aberration-corrected high-resolution transmission electron microscopy (AC-HRTEM) would provide a feasible way to observe the local structures. 17 The flakes are required to be highly crystalline or even single crystalline to allow sufficient stability against irradiation of electron beams and have a certain lateral size to allow enough space for the adjustment of crystal zones without damaging the imaged area despite the difficulty in crystallizing COFs. 18,19 Here, we propose to use layered surfactants to confine the growth of 3D COFs to gain single crystalline flakes with controlled morphology.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In biomineralization in organisms or bioinspired synthesis of inorganic materials, functional biomolecules or surfactants were utilized to passivate specific crystal facets by adsorption to grow single crystalline minerals with controlled morphology in water. , If the constrained crystal growth manner could be applied to create 2D flakes of 3D COFs with a thickness of less than 200 nm, aberration-corrected high-resolution transmission electron microscopy (AC-HRTEM) would provide a feasible way to observe the local structures . The flakes are required to be highly crystalline or even single crystalline to allow sufficient stability against irradiation of electron beams and have a certain lateral size to allow enough space for the adjustment of crystal zones without damaging the imaged area despite the difficulty in crystallizing COFs. , …”

Section: Introductionmentioning

confidence: 99%

Growth and Local Structures of Single Crystalline Flakes of Three-Dimensional Covalent Organic Frameworks in Water

Dong,

Liang,

Zhou

et al. 2023

J. Am. Chem. Soc.

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Due to the enormous chemical and structural diversities and designable properties and functionalities, covalent organic frameworks (COFs) hold great promise as tailored materials for industrial applications in electronics, biology, and energy technologies. They were typically obtained as partially crystalline materials, although a few single-crystal three-dimensional (3D) COFs have been obtained recently with structures probed by diffraction techniques. However, it remains challenging to grow single-crystal COFs with controlled morphology and to elucidate the local structures of 3D COFs, imposing severe limitations on the applications and understanding of the local structure–property correlations. Herein, we develop a method for designed growth of five types of single crystalline flakes of 3D COFs with controlled morphology, front crystal facets, and defined edge structures as well as surface chemistry using surfactants that can be self-assembled into layered structures to confine crystal growth in water. The flakes enable direct observation of local structures including monomer units, pore structure, edge structure, grain boundary, and lattice distortion of 3D COFs as well as gradually curved surfaces in kinked but single crystalline 3D COFs with a resolution of up to ∼1.7 Å. In comparison with flakes of two-dimensional crystals, the synthesized flakes show much higher chemical, mechanical, and thermal stability.

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High resolution transmission electron microscopy to study very thin crystalline layers buried at an amorphous–crystalline interface

Cited by 2 publications

References 21 publications

Low temperature formation of copper rich silicides

Low temperature formation of copper rich silicides

Growth and Local Structures of Single Crystalline Flakes of Three-Dimensional Covalent Organic Frameworks in Water

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