Structure‐Dependent Electrical Properties of Carbon Nanotube Fibers

Li, Qingwen; Yuan, Li; Zhang, Xiefei; Chikkannanavar, Satishkumar B.; Zhao, Yaohua; Dangelewicz, Andrea M.; Zheng, Lianxi; Doorn, Stephen K.; Jia, Q. X.; Peterson, D. E.; Arendt, P. N.; Zhu, Yuntian

doi:10.1002/adma.200602966

Cited by 418 publications

(310 citation statements)

References 38 publications

(51 reference statements)

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“…22,26 The NO 2 sensing properties of the different uncoated CNTs were then investigated. As shown in Figures 2b and S2a (Supporting Information), for the CNT700 and CNT3000 samples, respectively, the presence of NO 2 induces a decrease of the resistance of the bare CNT sensor devices, which is characteristic of a p-type behavior (the charge carriers are holes).…”

Section: Electrical Properties and Sensingmentioning

confidence: 99%

Tin Dioxide–Carbon Heterostructures Applied to Gas Sensing: Structure-Dependent Properties and General Sensing Mechanism

Marichy¹,

Russo²,

Latino³

et al. 2013

J. Phys. Chem. C

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Carbon materials such as carbon nanotubes (CNTs), graphene, and reduced graphene oxide (RGO) exhibit unique electrical properties, which are also influenced by the surrounding atmosphere. They are therefore promising sensing materials. Despite the existence of studies reporting the gas-sensing properties of metal oxide (MOx) coated nanostructured carbon, an incomplete understanding of their sensing mechanism remains. Here we report a systematic study on the preparation, characterization, and sensing properties of CNT and RGO composites with SnO2 coating. Atomic layer deposition (ALD) was applied to the conformal coating of the inner and outer walls of CNTs with thin films of SnO2 of various thicknesses, while nonaqueous sol-gel chemistry assisted by microwave heating was used to deposit tin dioxide onto RGO in one step. The sensing properties of SnO2/CNTs and SnO 2/RGO heterostructures toward NO2 target gas were investigated as a function of the morphology and density of the metal oxide coating. The general sensing mechanism of carbon-based heterostructures and the role of the various junctions involved are established. ABSTRACT: Carbon materials such as carbon nanotubes (CNTs), graphene, and reduced graphene oxide (RGO) exhibit unique electrical properties, which are also influenced by the surrounding atmosphere. They are therefore promising sensing materials. Despite the existence of studies reporting the gas-sensing properties of metal oxide (MO x ) coated nanostructured carbon, an incomplete understanding of their sensing mechanism remains. Here we report a systematic study on the preparation, characterization, and sensing properties of CNT and RGO composites with SnO 2 coating. Atomic layer deposition (ALD) was applied to the conformal coating of the inner and outer walls of CNTs with thin films of SnO 2 of various thicknesses, while nonaqueous sol−gel chemistry assisted by microwave heating was used to deposit tin dioxide onto RGO in one step. The sensing properties of SnO 2 / CNTs and SnO 2 /RGO heterostructures toward NO 2 target gas were investigated as a function of the morphology and density of the metal oxide coating. The general sensing mechanism of carbon-based heterostructures and the role of the various junctions involved are established.

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Section: Electrical Properties and Sensingmentioning

confidence: 99%

Tin Dioxide–Carbon Heterostructures Applied to Gas Sensing: Structure-Dependent Properties and General Sensing Mechanism

Marichy¹,

Russo²,

Latino³

et al. 2013

J. Phys. Chem. C

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“…For example, the s b and d for individual CNTs are in the ranges of 11 GPa-63 GPa and 10%-30%, respectively 2,3 . The k is as high as 10 6 S cm À 1 for single-walled CNTs 4 and 3 Â 10 4 S cm À 1 for multiwalled ones 5 . In order to fully utilize these excellent axial properties at a macroscopic level, CNTs must be assembled to form macroscopic fibres.…”

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confidence: 99%

High-strength carbon nanotube fibre-like ribbon with high ductility and high electrical conductivity

et al. 2014

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Macroscopic fibres made up of carbon nanotubes exhibit properties far below theoretical predictions and even much lower than those for conventional carbon fibres. Here we report improvements of mechanical and electrical properties by more than one order of magnitude by pressurized rolling. Our carbon nanotubes self-assemble to a hollow macroscopic cylinder in a tube reactor operated at high temperature and then condense in water or ethanol to form a fibre, which is continually spooled in an open-air environment. This initial fibre is densified by rolling under pressure, leading to a combination of high tensile strength (3.76-5.53 GPa), high tensile ductility (8-13%) and high electrical conductivity ((1.82-2.24) Â 10 4 S cm À 1 ). Our study therefore demonstrates strategies for future performance maximization and the very considerable potential of carbon nanotube assemblies for high-end uses.

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“…Due to their high-purity, high-quality and ordered structure, the superaligned CNT arrays can be converted into continuous fibers or sheets in the dry state [2,10,11,[14][15][16][17][18]. These fibers and sheets, within which the nanotubes possess a high degree of alignment, have also been incorporated into polymer matrices to make strong CNT/polymer composite fibers [19][20][21].…”

mentioning

confidence: 99%