Distinction between amorphous and crystalline silicon by means of electron energy-loss spectroscopy

Schade, Martin; Fuhrmann, Bodo; Chassé, A.; Heyroth, Frank; Roczen, Maurizio; Leipner, Hartmut S.

doi:10.1007/s00339-015-9201-5

Cited by 5 publications

(6 citation statements)

References 25 publications

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“…This is consistent with the disordered atomic arrangement in amorphous diamond. We find a similar phenomenon when comparing the EELS patterns of crystalline and amorphous Si 24 . These results provide further evidence that amorphous diamond synthesized in this study is tetrahedrally sp 3 bonded.…”

Section: Resultssupporting

confidence: 73%

“…Their absence in the EELS of amorphous diamond is further evidence of the disordered atomic arrangement in amorphous diamond. We find a similar phenomenon when comparing the EELS patterns of crystalline and amorphous Si 24 …”

Section: Resultssupporting

confidence: 71%

“…The carbon K-edge EELS of the recovered sample is compared with that of glassy carbon and nanocrystalline diamond in Fig. 2c 24 . The EELS of glassy carbon shows a sharp pre-peak at ~285 eV that corresponds to π bonding, as a result of its nearly 100% sp 2 bonds 23 .…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of quenchable amorphous diamond

et al. 2017

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Diamond owes its unique mechanical, thermal, optical, electrical, chemical, and biocompatible materials properties to its complete sp 3-carbon network bonding. Crystallinity is another major controlling factor for materials properties. Although other Group-14 elements silicon and germanium have complementary crystalline and amorphous forms consisting of purely sp 3 bonds, purely sp 3-bonded tetrahedral amorphous carbon has not yet been obtained. In this letter, we combine high pressure and in situ laser heating techniques to convert glassy carbon into “quenchable amorphous diamond”, and recover it to ambient conditions. Our X-ray diffraction, high-resolution transmission electron microscopy and electron energy-loss spectroscopy experiments on the recovered sample and computer simulations confirm its tetrahedral amorphous structure and complete sp 3 bonding. This transparent quenchable amorphous diamond has, to our knowledge, the highest density among amorphous carbon materials, and shows incompressibility comparable to crystalline diamond.

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Section: Resultssupporting

confidence: 73%

Section: Resultssupporting

confidence: 71%

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Synthesis of quenchable amorphous diamond

et al. 2017

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“…The flake‐like structures are similar to the flakes reported in literature for 2D zeolites prepared by mechanical exfoliation, crystal‐mediated CVD growth, and the very recent work by Birdsong et al in which graphene oxide was used as sacrificial template. [ 7,32 ] EELS spectra of these areas confirm that the flakes consist of ultrathin silica sheets, similar to the previously mentioned 2D zeolites [16b,17] . Unlike these methods, however, the synthesis here is continuously producing ≈1 g h −1 (F100) of coated material of which based on TGA ≈65 wt% (Figure S13, Supporting Information) directly converts to silica.…”

Section: Resultssupporting

confidence: 77%

“…As expected, a clear signature of graphene and a well‐defined Si L edge could be identified after the background signal was removed (reference EELS spectra taken from). [ 16 ] The Si signal not only indicates the presence of pure silicon [ 17 ] but also contains contributions from SiC. [ 18 ] The small shoulder at ≈115 eV might originate from bonded oxygen as in SiOC ceramics or an SiC/SiO 2 interface, [ 19 ] but a more precise deconvolution is difficult due to the signal noise.…”

Section: Resultsmentioning

confidence: 99%

Novel Aerosol‐Based Approach toward Mesoporous Silica Nanoparticles

Fortugno,

López-Cámara,

Kruse

et al. 2023

Adv Eng Mater

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This study introduces a novel gas‐phase method for the synthesis of mesoporous silica nanoparticles (MSNs). The method is a two‐step templating approach by first forming silicon‐coated carbon structures in a hybrid microwave‐plasma/hot‐wall reactor followed by an annealing step to produce mesoporous silica with distinct nanostructure and porosity. Two different (sacrificial) carbonaceous templates have been prepared (plasma reactor) and coated (hot‐wall reactor), 2D few‐layer graphene (FLG) flakes and soot‐like fractal aggregates. Results show that the wall thickness of the porous silica structures can be adjusted by changing the concentration of the silicon precursor (monosilane). High monosilane concentrations, however, result in solid silica particles after annealing. Using soot‐like particle templates permitted to control of the shell thickness of the hollow porous particles, while the FLG template results in ultrathin silica sheets after heat treatment. The pore volume and specific surface area increase up to 263 m2 g−1 and 0.6 cm3 g−1, respectively, by the formation of hollow porous particles. An adsorption study on carbamazepine reveals up to ≈86% removal. The gas‐phase aerosol‐based template method presented here offers scalability and versatility, and it is capable of producing MSNs with a controlled structure and porosity by modifying the carbonaceous templates.

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