Cross-sectional transmission electron microscopy of carbon nanotubes–catalyst–substrate heterostructure using a novel method for specimen preparation

Park, Jong-Bong; Cho, Yu-Seok; Hong, Sang-Young; Choi, Kyuseok; Kim, Dojin; Choi, Sukyung; Ahn, Sung-Ho; Song, Yinglin; Lee, Jinho; Cho, Kyoung-Ik

doi:10.1016/s0040-6090(02)00507-2

Cited by 20 publications

(8 citation statements)

References 19 publications

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“…Not likes a silicon substrate which can be easily broken by a force at the edge, the stainless steel is difficult to be cut for observing the cross section of interface. To solve such a problem, we prepared samples with short growth time while keeping the other conditions same, so that the sample can be sectioned using the method developed by J B Park 19 . The CNTs were found being of around a micrometer long ( Fig.…”

Section: Resultsmentioning

confidence: 99%

A Fully-Sealed Carbon-Nanotube Cold-Cathode Terahertz Gyrotron

Yuan

Zhu

Zhang

et al. 2016

Sci Rep

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Gigahertz to terahertz radiation sources based on cold-cathode vacuum electron technology are pursued, because its unique characteristics of instant switch-on and power saving are important to military and space applications. Gigahertz gyrotron was reported using carbon nanotube (CNT) cold-cathode. It is reported here in first time that a fully-sealed CNT cold-cathode 0.22 THz-gyrotron is realized, typically with output power of 500 mW. To achieve this, we have studied mechanisms responsible for CNTs growth on curved shape metal surface, field emission from the sidewall of a CNT, and crystallized interface junction between CNT and substrate material. We have obtained uniform growth of CNTs on and direct growth from cone-cylinder stainless-steel electrode surface, and field emission from both tips and sidewalls of CNTs. It is essential for the success of a CNT terahertz gyrotron to have such high quality, high emitting performance CNTs. Also, we have developed a magnetic injection electron gun using CNT cold-cathode to exploit the advantages of such a conventional gun design, so that a large area emitting surface is utilized to deliver large current for electron beam. The results indicate that higher output power and higher radiation frequency terahertz gyrotron may be made using CNT cold-cathode electron gun.

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Section: Resultsmentioning

confidence: 99%

A Fully-Sealed Carbon-Nanotube Cold-Cathode Terahertz Gyrotron

Yuan

Zhu

Zhang

et al. 2016

Sci Rep

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“…In order to clarify the effect of the surface roughness of the MWCNT array on the adhesive properties, MWCNT arrays with surface roughness values ranging from 50 to 200 nm were produced by adjusting the substrate temperature during the MPCVD growth process [34][35][36][37]. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The Ni-coated substrate was pretreated in hydrogen (H 2 ) plasma for 10 min and was then transferred to the chamber of a 915-MHz microwave plasma chemical vapor deposition (MPCVD) system [35][36][37]. MWCNT arrays were then grown on the substrate surface by introducing H 2 and methane gas into the chamber at flow rates of 90 sccm and 10 sccm, respectively, while maintaining the substrate at a constant temperature of 400°C, 450°C, 500°C, or 550°C.…”

Section: Sample Preparationmentioning

confidence: 99%

Effects of surface morphology, size effect and wettability on interfacial adhesion of carbon nanotube arrays

et al. 2013

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“…[29], but instead of M-bond 610 the Gatan G1 two-component epoxy resin was used. Also, SWNT material scraped from the original samples was analysed by TEM.…”

Section: Methodsmentioning

confidence: 99%

Structural and chemical evolution of single-wall carbon nanotubes under atomic and molecular deuterium interaction

Lisowski

Keim²,

Berg³

et al. 2005

Carbon

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The interaction of atomic (D) and molecular (D 2 ) deuterium, as present in a (D + D 2 ) gas mixture, with single-wall carbon nanotubes (SWNTs) has been studied by means of a combination of scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The SWNT samples were exposed to the gas mixture, produced by thermal dissociation of D 2 on a hot W filament, its temperature, T W , being kept at 1020 and 1550 K for a deuterium pressure of 0.6 and 60 Pa, respectively. Prolonged interaction of the low-pressure (D + D 2 ) gas mixture produced at T W = 1020 K leads to a conglomeration of the SWNT bundles into larger diameter ropes of square and triangular cross-section, covered by nanoaggregates of graphite material. Both the coalescence of single SWNTs and a massive reconstruction of bundles of SWNTs into a ''coral reef''-like structure were found to occur after prolonged exposure of SWNTs to the high-pressure (D + D 2 ) gas mixture produced at T W = 1550 K. This structure is formed by the encapsulated Fe nanoparticles and deuterocarbon-like species appearing as a result of the deuterium interaction with the SWNT bundles accompanied by partial erosion of the SWNT material. The XPS valence-band spectra disclose electronic features characteristic for a hydrogen-plasma modified multi-wall carbon nanotube (MWNT)-like structure as a result of an intensive (D + D 2 ) induced transformation of the SWNTs into the ''coral reef''-like structure.

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Cross-sectional transmission electron microscopy of carbon nanotubes–catalyst–substrate heterostructure using a novel method for specimen preparation

Cited by 20 publications

References 19 publications

A Fully-Sealed Carbon-Nanotube Cold-Cathode Terahertz Gyrotron

A Fully-Sealed Carbon-Nanotube Cold-Cathode Terahertz Gyrotron

Effects of surface morphology, size effect and wettability on interfacial adhesion of carbon nanotube arrays

Structural and chemical evolution of single-wall carbon nanotubes under atomic and molecular deuterium interaction

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