Pressure-induced reversible transformation in single-wall carbon nanotube bundles studied by Raman spectroscopy

Teredesai, Pallavi V.; Sood, Anil K.; Muthu, D. V. S.; Sen, Rahul; Govindaraj, A.; Rao, C. N. R.

doi:10.1016/s0009-2614(00)00123-8

Cited by 85 publications

(63 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6) as is expected in case of SWCNT bundles under stress. [32][33][34] This indicates that the SWCNTs forming the network are not under stress post deposition of ta-C.…”

Section: B Evaporated Carbon Coated Samplesmentioning

confidence: 98%

“…[32][33][34] The Raman spectra of samples (on silicon substrates) post deposition of 20 nm and 50 nm of ta-C were acquired and are shown in Figs. 6(a) and 6(b), respectively.…”

Section: B Evaporated Carbon Coated Samplesmentioning

confidence: 99%

“…As has been stated previously, the ta-C formation is due to the sub-plantation process of energetic Cþ ions. In case of H3-SG, the evaporated carbon film (3 nm) and variation in its thickness do not allow for stable interface formation during ta-C deposition, 33 as a result of which the composite had higher wear due to improper adhesion. However, H6-SG and H9-SG had a thicker evaporated carbon film leading to stable interface and good adhesion.…”

Section: B Evaporated Carbon Coated Samplesmentioning

confidence: 99%

See 2 more Smart Citations

Effect of tetrahedral amorphous carbon coating on the resistivity and wear of single-walled carbon nanotube network

Iyer

Kaskela

Novikov

et al. 2016

Journal of Applied Physics

View full text Add to dashboard Cite

Single walled carbon nanotube networks (SWCNTNs) were coated by tetrahedral amorphous carbon (ta-C) to improve the mechanical wear properties of the composite film. The ta-C deposition was performed by using pulsed filtered cathodic vacuum arc method resulting in the generation of Cþ ions in the energy range of 40-60 eV which coalesce to form a ta-C film. The primary disadvantage of this process is a significant increase in the electrical resistance of the SWCNTN post coating. The increase in the SWCNTN resistance is attributed primarily to the intrinsic stress of the ta-C coating which affects the inter-bundle junction resistance between the SWCNTN bundles. E-beam evaporated carbon was deposited on the SWCNTNs prior to the ta-C deposition in order to protect the SWCNTN from the intrinsic stress of the ta-C film. The causes of changes in electrical resistance and the effect of evaporated carbon thickness on the changes in electrical resistance and mechanical wear properties have been studied. Published by AIP Publishing.

show abstract

“…6) as is expected in case of SWCNT bundles under stress. [32][33][34] This indicates that the SWCNTs forming the network are not under stress post deposition of ta-C.…”

Section: B Evaporated Carbon Coated Samplesmentioning

confidence: 98%

“…[32][33][34] The Raman spectra of samples (on silicon substrates) post deposition of 20 nm and 50 nm of ta-C were acquired and are shown in Figs. 6(a) and 6(b), respectively.…”

Section: B Evaporated Carbon Coated Samplesmentioning

confidence: 99%

Section: B Evaporated Carbon Coated Samplesmentioning

confidence: 99%

See 1 more Smart Citation

Effect of tetrahedral amorphous carbon coating on the resistivity and wear of single-walled carbon nanotube network

Iyer

Kaskela

Novikov

et al. 2016

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…The study further indicated that this may not be an effective indicator for structural transition [33]. The tangential mode frequencies of aligned SWCNTs show an interesting variation trend with increasing pressure, characterized by an initial increase until 11 GPa, then a decrease until 16 GPa, and an increase again beyond 16 GPa [30,32]. This anomalous pressure dependence was also attributed to the hexagonal and elliptical cross-section of deformed tubes [30,32].…”

mentioning

confidence: 94%

High-pressure behaviors of carbon nanotubes

Zhao

Zhou

et al. 2012

J. Superhard Mater.

View full text Add to dashboard Cite

High-pressure behaviors of carbon nanotubesIn this paper, we have reviewed the experimental and theoretical studies on pressure-induced polygonization, ovalization, racetrack-shape deformation, and polymerization of carbon nanotubes (CNTs). The corresponding electronic, optical, and mechanical changes accompanying these behaviors have been discussed. The transformations of armchair (n, n) CNT bundles (n = 2, 3, 4, 6, and 8) Keywords: pressure-induced carbon nanotubes, polymerization, novel metastable carbons, electronic and mechanical characteristics. INTRODUCTIONCarbon adopts a wide range of allotropes with unique physical and chemical properties, e.g., graphite, diamond, fullerenes, nanotubes, chaoite, graphene, and amorphous carbon due to its ability to form sp-, sp 2 -, and sp 3 -hybridized bonds. Graphite, the most stable form of carbon at ambient pressure, has a layered and planar structure with the stacked graphene layers coupled by delocalized weak π bonds resulting in conductive and soft nature. Graphene, a recently rising star material, is one-atom-thick planar sheet with a honeycomb crystal lattice like that of graphite. Graphene has the amazing conductivity and strongest tensile strength along the planar layer directions but flexile in the other directions because of the conductive, strong, and flexile sp 2 bonds. Fullerenes and carbon nanotubes (CNTs) represent another two classes of fully sp 2 bonding carbons and are the focus of modern nanoscience and nanotechnology. Structurally, fullerenes are hollow graphitic cage structures composed of nonplanar 5-and 6-membered carbon rings. The smallest fullerene is C 20 [1] . Larger fullerene with increased diameter can also be formed [2,3]. Among them, purified C 60 and C 70 are now commercially available. CNTs can be considered as seamless cylinders formed by rolling single-or multilayer graphene. Different rolling manners yield distinct diametral and chiral CNTs. Given these unique configurations, CNTs possess a wide range of chemical and physical properties, e.g., low density, versatile electronic properties (insulating, semiconducting, Pressure is an effective means to induce the sp 2 -to-sp 3 bond change in carbon, and the produced metastable carbon phases strongly depend on the crystal structure and hybridization scheme of raw carbons, as well as on applied hydrostatic/nonhydrostatic pressure. For example, the compression of graphite can experimentally yield cubic and hexagonal diamonds, as well as a superhard coldcompressed post-graphite phase [5][6][7][8][9][10]. The glass carbon under pressure can transform into a superhard amorphous diamond [11], whereas the compression of C 60 and C 70 fullerenes can produce interesting 1D, 2D, and 3D C 60 and C 70 polymers, as well as other elusive new carbon phases [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Because a variety of CNT configurations can now be synthesized with a high yield, more interesting pressure-induced structural, electronic, and mechanical changes in CNTs are expected an...

show abstract

“…This effect could be caused by the damage of SWCNTs at the top (1-2 nm) of the bundles for the first few nanometers of coating deposition 21,22,34 due to Cþ ions generated in the p-FCVA process. [14][15][16]32 However, similar effects are observed when SWCNTs are subjected to pressure 35,36 and ta-C is known to have high compressive stress. [14][15][16] The narrowing of D, G, and G 0 peaks and better peak separation of G-and Gþ peaks for S-40-OPT (Figs.…”

Section: 32mentioning

confidence: 78%

Single walled carbon nanotube network—Tetrahedral amorphous carbon composite film

Iyer

Kaskela

Johansson

et al. 2015

Journal of Applied Physics

View full text Add to dashboard Cite

Articles you may be interested inEffect of tetrahedral amorphous carbon coating on the resistivity and wear of single-walled carbon nanotube network J. Appl. Phys. 119, 185306 (2016) Single walled carbon nanotube network (SWCNTN) was coated by tetrahedral amorphous carbon (ta-C) using a pulsed Filtered Cathodic Vacuum Arc system to form a SWCNTN-ta-C composite film. The effects of SWCNTN areal coverage density and ta-C coating thickness on the composite film properties were investigated. X-Ray photoelectron spectroscopy measurements prove the presence of high quality sp 3 bonded ta-C coating on the SWCNTN. Raman spectroscopy suggests that the single wall carbon nanotubes (SWCNTs) forming the network survived encapsulation in the ta-C coating. Nano-mechanical testing suggests that the ta-C coated SWCNTN has superior wear performance compared to uncoated SWCNTN. V C 2015 AIP Publishing LLC.

show abstract

Pressure-induced reversible transformation in single-wall carbon nanotube bundles studied by Raman spectroscopy

Cited by 85 publications

References 27 publications

Effect of tetrahedral amorphous carbon coating on the resistivity and wear of single-walled carbon nanotube network

Effect of tetrahedral amorphous carbon coating on the resistivity and wear of single-walled carbon nanotube network

High-pressure behaviors of carbon nanotubes

Single walled carbon nanotube network—Tetrahedral amorphous carbon composite film

Contact Info

Product

Resources

About