Revealing distortion of carbon nanotube walls via angle-resolved X-ray spectroscopy

Kanygin, M. A.; Окотруб, А. В.; Bulusheva, L. G.; Vilkov, O. Yu.; Hata, Kenji

doi:10.1016/j.cap.2015.06.017

Cited by 3 publications

(3 citation statements)

References 44 publications

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“…This change could be caused by the changes in the orientation of graphene layers with respect to the incident X-ray beam [ 60 ]. It was shown earlier that the ratio of π* and σ* resonances in C K-edge spectra of aligned CNTs depends on the angle of the incident radiation with respect to the surface of the array of multi-walled CNTs [ 61 , 62 , 63 , 64 , 65 ] and single-walled CNTs [ 60 ]. The π*/σ* ratio is maximal when the X-ray beam is normal to the sample surface.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

et al. 2020

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Vertically aligned carbon nanotube (CNT) arrays show potential for the development of planar low-voltage emission cathodes. The characteristics of cathodes can be improved by modifying their surface, e.g., by hydrogen plasma treatment, as was performed in this work. The surface of multi-walled CNT arrays grown on silicon substrates from toluene and ferrocene using catalytic chemical vapor deposition was treated in a high-pressure (~104 Pa) microwave reactor. The structure, composition, and current-voltage characteristics of the arrays were studied before and after hydrogen plasma treatment at various power values and durations. CNT tips were destroyed and catalytic iron was released from the CNT channels. The etching rate was influenced by iron particles that formed on the array surface. The lower emission threshold in the plasma-treated arrays than in the initial sample is explained by the amplification factor of the local electric field increasing due to graphene structures of unfolded nanotube layers that formed at the CNT tips.

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Section: Resultsmentioning

confidence: 99%

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

et al. 2020

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“…The NEXAFS spectra provide information on the density of unoccupied states and due to the different electronic structures of graphite and diamond, the C K-edge spectra of these allotropes of carbon differ strongly. , The anisotropy of the chemical bonding in graphitic materials causes the dependence of the C K-edge spectra on the incidence angle of radiation. The dependences obtained were early used to determine the misorientation of layers in graphite materials , and the alignment of multiwalled carbon nanotubes − and single-walled carbon nanotubes , in arrays. By recording the C K-edge spectra in the total electron yield (TEY) and Auger electron yield (AEY) modes, we probe the electronic state of carbon at different sample depths.…”

Section: Introductionmentioning

confidence: 99%

Iron-Catalyzed Growth of Vertical Graphitic Layers on the (100) Face of Single-Crystal Diamond

et al. 2023

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The transformation of diamond into graphite occurs at elevated temperatures, and by controlling this process, sp2/sp3 carbon hybrids can be created. In this work, we study the effect of a thin iron film coating on the reconstruction of a (100) diamond face. We use a synthetic single-crystal and anneal it in ultrahigh vacuum at 1150 °C for 15 min. The electronic state of carbon on a clean face and a coated face is immediately examined by X-ray photoelectron spectroscopy and angle-dependent near-edge X-ray absorption fine structure spectroscopy. Raman spectroscopy and scanning electron microscopy measurements complete the structural characterization of the annealed sample. An analysis of the experimental data reveals the formation of thin sp2-carbon fragments on a clean (100) diamond surface and ordered graphite planes on the iron-coated surface. According to our estimates, iron catalyzes the transformation of roughly 10 nm diamond into graphitic layers growing vertically relative to the (100) face of the diamond.

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“…In science, laser are used in many ways such as in spectroscopy [1][2][3][4][5], microscopy [6][7][8][9], photochemistry [10][11][12], barcode scanner, heat treatment [13][14][15] and extra. Laser can be a good energy weapon for the military and basically laser used to be a pointer guide for targeting.…”

Section: Introductionmentioning

confidence: 99%

The Application of Laser in Thermal Treatment of Solid Particles and Gas-Phase of Biomass Processing-a Review

Junoh

Ani

2016

Jurnal Teknologi

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Application of laser in heating technique of both organic gas-phase and solid particles for thermochemical decomposition at elevated temperatures in the absence of oxygen is presently a challenging area. Laser pyrolysis is a powerful and a versatile tool for the gas-phase synthesis of nanoparticles. Generally, the purpose of pyrolysis is not only for energy production but also for the production of chemical feedstocks. This paper reviews on the pyrolysis activities, generally in Malaysia and the utilization of laser in pyrolysis for renewable energy and materials application. Malaysia is a well-known for palm oil producer country in the world, generating significant wastes yearly from oil palm mills such as empty fruit brunch (EFB), shell, fiber and palm oil mill effluent (POME) has put the government to solve these wastes problem by doing research on the development of renewable energy and materials. This reviews concluded that there are new area of research for the utilization of waste material by using laser technique.

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Revealing distortion of carbon nanotube walls via angle-resolved X-ray spectroscopy

Cited by 3 publications

References 44 publications

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

Iron-Catalyzed Growth of Vertical Graphitic Layers on the (100) Face of Single-Crystal Diamond

The Application of Laser in Thermal Treatment of Solid Particles and Gas-Phase of Biomass Processing-a Review

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