Electron beam induced formation of carbon nanorods

Chen, K.H; Wu, Chien Ting; Hwang, Jeong-Yuan; Wen, Cheng; Chen, L.C; Wang, C.T; Ma, Kougen

doi:10.1016/s0022-3697(01)00095-6

Cited by 25 publications

(16 citation statements)

References 15 publications

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“…Electron beam-induced deformation of the pure CNTs has been observed previously but at very high electron beam energy of 3 MeV. 10 No structural deformation was observed from our undoped samples in electron energy to 300 keV.…”

supporting

confidence: 65%

X-ray photoemission spectroscopy study of fluorinated single-walled carbon nanotubes

Heo

Jeon

et al. 2002

Applied Physics Letters

152

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We have investigated the change of atomic and electronic structures of fluorinated single-walled carbon nanotubes (SWCNTs) using x-ray photoemission spectroscopy (XPS), electrical resistivity measurements, and transmission electron microscopy (TEM). The fluorine content increases with increasing reaction temperature up to 300 °C. XPS indicated that the fluorinated SWCNT reveals an ionic-bonding character at low concentration and covalent-bonding character at high concentration. The resistivity increases with reaction temperatures, resulting from the band gap enlargement at high fluorine concentration. It is also observed from TEM that the fluorination at reaction temperature above 250 °C leads to the disintegration of the CNT structures and formation of various phases such as multiwall-like and turbostratic morphologies.

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supporting

confidence: 65%

X-ray photoemission spectroscopy study of fluorinated single-walled carbon nanotubes

Heo

Jeon

et al. 2002

Applied Physics Letters

152

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“…The three kinds of carbon hybrid bonds, sp 1 , sp 2 , and sp 3 , different C-C, C-O, and C-H bonding arrangement, and dimensional network make the carbon-containing films a complex structure with a wide variety of allotropy and applications [1]. Formations like quasi-zero-dimensional (Q0D) spheres/nanoparticles [2,3], quasi-one-dimensional (Q1D) wires/rods/tubes [4,5], and quasi-two-dimensional (Q2D) walls/flakes/sheets nanocarbon were reported [6].…”

Section: Introductionmentioning

confidence: 99%

Morphology, Microstructure, and Hydrogen Content of Carbon Nanostructures Obtained by PECVD at Various Temperatures

Gentoiu

Betancourt-Riera

Vizireanu

et al. 2017

Journal of Nanomaterials

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Carbon nanostructures were obtained by acetylene injection into an argon plasma jet in the presence of hydrogen. The samples were synthesized in similar conditions, except that the substrate deposition temperatures were varied, ranging from 473 to 973 K. A strong dependence of morphology, structure, and graphitization upon was found. We obtained vertical aligned carbon nanotubes (VA-CNTs) at low temperatures as 473 K, amorphous carbon nanoparticles (CNPs) at temperatures from about 573 to 673 K, and carbon nanowalls (CNWs) at high temperatures from 773 to 973 K. Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, elastic recoil detection analysis, X-ray photoelectron spectroscopy, and Raman spectroscopy were used to substantiate the differences in these material types. It is known that hydrogen concentration modifies strongly the properties of the materials. Different concentrations of hydrogen-bonded carbon could be identified in amorphous CNP, VA-CNT, and CNW. Also, the H : C ratios along depth were determined for the obtained materials.

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“…Recently nanocrystalline diamond has been obtained directly from carbon nanotubes at high pressure; 37 and the theoretical relaxation of carbon multiwalled nanotubes has been performed using the empirical many-body potential energy functional and ͑ca-nonical͒ molecular dynamics at 1 K 38,39 by Erkoç et al, showing the beginning of their transformation into what is best described as ta-C nanorods, in line with experimental observations. 40…”

Section: Discussionmentioning

confidence: 99%

Size dependent phase stability of carbon nanoparticles: Nanodiamond versus fullerenes

Barnard

Russo

Snook

2003

The Journal of Chemical Physics

103

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Over the past 15 years, a number of studies have reported findings comparing the relative stability of diamond and graphite, at the nanoscale. In light of more recent experimental and theoretical results concerning the transformation of nanodiamonds into carbon-onions, it is considered important to extend this body of work to included fullerenes. Presented here is a study of the phase stability of carbon nanoparticles, with particular attention given to the relative stability of nanodiamonds and fullerenes. The structural energies have been calculated using density functional theory within the generalized gradient approximation using the Vienna ab initio simulation package, and used to determine the standard heat of formation for respective carbon phases as a function of the number of carbon atoms. Our results show that in contrast to previously reported studies, nanodiamond is not necessarily the stable phase a the nanoscale, but instead occupies a ''window'' of stability between ϳ1.9 and ϳ5.2 nm.

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Electron beam induced formation of carbon nanorods

Cited by 25 publications

References 15 publications

X-ray photoemission spectroscopy study of fluorinated single-walled carbon nanotubes

X-ray photoemission spectroscopy study of fluorinated single-walled carbon nanotubes

Morphology, Microstructure, and Hydrogen Content of Carbon Nanostructures Obtained by PECVD at Various Temperatures

Size dependent phase stability of carbon nanoparticles: Nanodiamond versus fullerenes

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