Investigating the distribution and bonding of light elements alloyed in carbonaceous materials using EELS in the TEM/STEM

Brydson, Rik; Westwood, Aidan; Jiang, Xin; Rowen, S.J.; Collins, Stephen F; Lu, Stephen C.-Y.; Rand, B.; Wade, K.; Coult, Robert

doi:10.1016/s0008-6223(98)00090-6

Cited by 14 publications

(8 citation statements)

References 18 publications

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“…10 Therefore, electron-energy loss spectroscopy 10 ͑EELS͒ in a transmission electron microscope or x-ray absorption near edge spectroscopy 11 ͑XANES͒ are more suitable techniques to obtain structural information. The structure of BCN films has been studied with EELS [12][13][14][15][16] although a definitive proof of the synthesis of a ternary compound is still lacking. Moreover, in certain cases, phase segregation has been observed in both hexagonal 12 and cubic structures.…”

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confidence: 99%

Identification of ternary boron–carbon–nitrogen hexagonal phases by x-ray absorption spectroscopy

Gago

Jiménez

Albella

et al. 2001

Applied Physics Letters

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Boron carbon nitride ͑BCN͒ films have been grown by B 4 C evaporation with concurrent N 2 ϩ ion assistance, and have been characterized by x-ray absorption near edge ͑XANES͒ spectroscopy. Upon the nitrogen insertion, the film structure evolves from B x C-like to h-BN-like. The hexagonal structure corresponds to a true ternary BCN compound that can be understood as h-BN with carbon incorporated in substitutional sites. The C͑1s)XANES presents * states characteristic of the BCN arrangement. The basal planes of the h-BCN phase are oriented perpendicular to the substrate, as derived from the angle dependence of the XANES signal.

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confidence: 99%

Identification of ternary boron–carbon–nitrogen hexagonal phases by x-ray absorption spectroscopy

Gago

Jiménez

Albella

et al. 2001

Applied Physics Letters

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“…This signal belongs to the dispersion from the second layer, and in the graphite corresponds to the sixth nearest neighboring atoms in the ab plane. [50]…”

Section: Resultsmentioning

confidence: 99%

EELS analysis of Nylon 6 nanofibers reinforced with nitroxide-functionalized graphene oxide

Leyva‐Porras¹,

Ornelas²,

Miki‐Yoshida³

et al. 2014

Carbon

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A detailed analysis by transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) of nitroxide-functionalized graphene oxide layers (GOFT) dispersed in Nylon 6 nanofibers is reported herein. The functionalization and exfoliation process of graphite oxide to GOFT was confirmed by TEM using electron diffraction patterns (EDP), wherein 1 to 4 graphene layers of GOFT were observed. The distribution and alignment of GOFT layers within a sample of Nylon 6 nanofiber reveals that GOFT platelets are mainly within the fiber, but some were partially protruding from it. Furthermore, Nylon 6 nanofibers exhibit an average diameter of 225 nm with several microns in length. GOFT platelets embedded into the fiber, the pristine fiber, and amorphous carbon were analyzed by EELS where each spectra [corresponding to the carbon edge (C-K)] exhibited changes in the fine structure, allowing a clear distinction between: i) GOFT single-layers, ii) Nylon-6 nanofibers, and iii) the carbon substrate. EELS analysis is presented here for the first time as a powerful tool to identify functionalized graphene single-layers (< 4 layers of GOFT) into a Nylon 6 nanofiber composite.

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“…However, any cracks or breaks in this coating developed during thermal cycling would necessitate a repeat of the pre-treatment step in order to reinstate the oxidation resistance. Other previous work has also demonstrated that improved oxidation resistance can be achieved in synthetic mesophase pitch-derived carbon if borazarene precursors are used to generate the synthetic pitch [32][33][34]. In this case, boria forms a mobile protective diffusion barrier which prevents oxidation effectively at temperatures up to ca.…”

Section: Introductionmentioning

confidence: 99%

Oxidation resistant carbon materials derived from boronated carbon–silicon alloys

Westwood

Rand

2004

Carbon

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Investigating the distribution and bonding of light elements alloyed in carbonaceous materials using EELS in the TEM/STEM

Cited by 14 publications

References 18 publications

Identification of ternary boron–carbon–nitrogen hexagonal phases by x-ray absorption spectroscopy

Identification of ternary boron–carbon–nitrogen hexagonal phases by x-ray absorption spectroscopy

EELS analysis of Nylon 6 nanofibers reinforced with nitroxide-functionalized graphene oxide

Oxidation resistant carbon materials derived from boronated carbon–silicon alloys

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