Electrochemical Charge Storage Properties of Vertically Aligned Carbon Nanotube Films: Effects of Thermal Oxidation

Brown, Billyde; Stoner, Brian R.; Grill, Warren M.; Glass, J. T.

doi:10.1021/jp304419a

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…23 To facilitate the transfer of the CNT forest, the as-grown CNT forest on Si wafer is annealed in air on a hotplate at 540 C for 15 min to partially oxidize the region of the CNT forest connecting to iron seeds. 30 It is worth noting that the Au-CNT forest is upside down after the dry-transfer step. The intertwined top section of the original Au-CNT forest serves as a conductive network at the base of the crumpled Au-CNT forest electrode.…”

Section: Resultsmentioning

confidence: 99%

Robust and High-Performance Electrodes via Crumpled Au-CNT Forests for Stretchable Supercapacitors

Zhou

Cao

et al. 2020

Matter

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A robust and high-performance stretchable electrode was developed via crumpled Au-coated carbon nanotube (Au-CNT) forest transferred onto a compliant substrate. Compared with a pure CNT forest electrode, the Au-CNT forest electrode exhibits one order magnitude lower resistance. The stretchable Au-CNT forest electrodes and supercapacitors demonstrate significant improvement in mechanical reliability and electrochemical stability under extremely large strains. This research offers a facile approach to fabricate stretchable supercapacitors based on vertically aligned nanotubes or nanowires for exceptional and robust electrochemical performance.

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Section: Resultsmentioning

confidence: 99%

Robust and High-Performance Electrodes via Crumpled Au-CNT Forests for Stretchable Supercapacitors

Zhou

Cao

et al. 2020

Matter

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“…Ye et al [99] electrodeposited molybdenum oxide (MoO x ) on VA-VNTs forests to develop electrochemical sensors for the detection of bromate. Brown et al [100] investigated the potential use of VA-CNTs as neural stimulation electrodes. They performed flash oxidation (short exposition time of 20 min) of the VA-CNTs in O 2 (100 sccm) at various temperatures (between 200 °C and 500 °C) aiming at improving their charge storage properties.…”

Section: Reviewmentioning

confidence: 99%

Functionalization of vertically aligned carbon nanotubes

Hooijdonk¹,

Bittencourt²,

Snyders³

et al. 2013

Beilstein J. Nanotechnol.

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SummaryThis review focuses and summarizes recent studies on the functionalization of carbon nanotubes oriented perpendicularly to their substrate, so-called vertically aligned carbon nanotubes (VA-CNTs). The intrinsic properties of individual nanotubes make the VA-CNTs ideal candidates for integration in a wide range of devices, and many potential applications have been envisaged. These applications can benefit from the unidirectional alignment of the nanotubes, the large surface area, the high carbon purity, the outstanding electrical conductivity, and the uniformly long length. However, practical uses of VA-CNTs are limited by their surface characteristics, which must be often modified in order to meet the specificity of each particular application. The proposed approaches are based on the chemical modifications of the surface by functionalization (grafting of functional chemical groups, decoration with metal particles or wrapping of polymers) to bring new properties or to improve the interactions between the VA-CNTs and their environment while maintaining the alignment of CNTs.

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“…We previously estimated the contact conductivity of a CNT/CNT interface from the in-plane conductivity of an uncapped CNT forest on silicon carbide (SiC). For CNT forests formed by the catalyst-CVD method, although their distinctive properties are expected to be useful for VLSI vias, , supercapacitors, − and so forth, many challenges must be overcome, for example, the existence of voids and bundles, wavy parts, and entangled parts on their tops, the existence of the metal catalyst as an impurity, and the differentiation of CNT chiralities. A CNT forest formed on SiC by the surface decomposition method , is nearly ideally dense and highly uniform with no entangled parts on the top.…”

mentioning

confidence: 99%

Contact Conductivity of Uncapped Carbon Nanotubes Formed by Silicon Carbide Decomposition

et al. 2016

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Understanding of the contact conductivity of carbon nanotubes (CNTs) will contribute to the further application of CNTs for electronic devices, such as thin film transistors whose channel or electrode is made of dispersed CNTs. In this study, we estimated the contact conductivity of a CNT/CNT interface from the in-plane conductivity of an uncapped CNT forest on SiC. Investigation of the electrical properties of dense CNT forests is also important to enable their electrical application. The in-plane conductivity of a dense CNT forest on silicon carbide normalized by its thickness was measured to be 50 S/cm, which is two to three orders of magnitude lower than the conductivity of a CNT yarn. It was also found that both the CNT cap region and the CNT bulk region exhibit in-plane conductivity. The contact conductivity of CNTs was estimated from the in-plane conductivity in the bulk region. Dense and uncapped CNT forest can be approximated by a conductive mesh, in which each conductive branch corresponds to the CNT/CNT contact conductance. The evaluated contact conductivity was in good agreement with that calculated from the tunneling effect.

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Electrochemical Charge Storage Properties of Vertically Aligned Carbon Nanotube Films: Effects of Thermal Oxidation

Cited by 5 publications

References 26 publications

Robust and High-Performance Electrodes via Crumpled Au-CNT Forests for Stretchable Supercapacitors

Robust and High-Performance Electrodes via Crumpled Au-CNT Forests for Stretchable Supercapacitors

Functionalization of vertically aligned carbon nanotubes

Contact Conductivity of Uncapped Carbon Nanotubes Formed by Silicon Carbide Decomposition

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