Pore structure of raw and purified HiPco single-walled carbon nanotubes

Cinke, Martin; Li, Jing; Chen, Bin; Cassell, Alan M.; Delzeit, Lance; Han, Jie; Meyyappan, M.

doi:10.1016/s0009-2614(02)01420-3

Cited by 221 publications

(150 citation statements)

References 15 publications

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“…Since purified CNTs have very large surface area (1587 m 2 /g) 203 and extremely high conductivity, CNT composite show low threshold and sharp slope of percolation conductivity around the threshold. Thus, the sensors using CNT composite as sensing materials have higher sensitivity.…”

Section: Security and Othersmentioning

confidence: 99%

Carbon Nanotube-Based Sensors

Sinha¹,

Ma²,

Yeow³

2006

j nanosci nanotechnol

460

230

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Sensors continue to make significant impact in everyday life. There has been a strong demand for producing highly selective, sensitive, responsive, and cost effective sensors. As a result, research emphasis is on developing new sensing materials and technologies. Carbon nanotubes (CNTs) have many distinct properties that may be exploited to develop next generation of sensors. This manuscript reviews the distinct physical, electronic, and mechanical properties of CNTs. The main thrust of this review is to highlight the present and future research and development work in the area of carbon nanotube sensors for real-world applications. The technical challenges associated with CNT-based sensors, which remain to be fully addressed, have also been outlined at the end of the manuscript. This review aims to act as a reference source for researchers to help them in developing new applications of CNT-based sensors.

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Section: Security and Othersmentioning

confidence: 99%

Carbon Nanotube-Based Sensors

Sinha¹,

Ma²,

Yeow³

2006

j nanosci nanotechnol

460

230

View full text Add to dashboard Cite

show abstract

“…[23] The incorporation of carbon nanotubes has the potential to address a variety of long-standing issues with respect to biosensing. In particular, the high surface area of single-walled CNTs (SWNTs), estimated as high as 1600 m 2 g −1 , [24] while maintaining electrical conductivity is of particular interest to achieve high biomolecule densities suitable for device miniaturization. This is further augmented by the ballistic transport of electrons or holes through SWNTs, with current densities as high as 10 9 A cm −2 in the presence of oxygen, [18,25] along with prevention of current-induced migration of metal contacts.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotubes for Electronic and Electrochemical Detection of Biomolecules

2007

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The unique electronic and optical properties of carbon nanotubes, in conjunction with their size and mechanically robust nature, make these nanomaterials crucial to the development of next-generation biosensing platforms. In this Review, we present recent innovations in carbon nanotube-assisted biosensing technologies, such as DNA-hybridization, protein-binding, antibody-antigen and aptamers. Following a brief introduction on the diameter-and chirality-derived electronic characteristics of single-walled carbon nanotubes, the discussion is focused on the two major schemes for electronic biodetection, namely biotransistor-and electrochemistry-based sensors. Key fabrication methodologies are contrasted in light of device operation and performance, along with strategies for amplifying the signal while minimizing nonspecific binding. This Review is concluded with a perspective on future optimization based on array integration as well as exercising a better control in nanotube structure and biomolecular integration.

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“…The highly adhesive structure of the raw SWCNTs resulted in difficulties with gas adsorption accessibility [19]. Therefore, the measured surface area of the raw SWCNTs was significantly smaller than the theoretical BET area (3000 m 2 g −1 for open nanotubes 3 nm in diameter with 0.4 nm spacing between the walls of two adjacent tubes) [25]. Most importantly, the adhesive structure of the raw SWCNTs led to an uneven distribution of particles on the filter surface [20].…”

Section: Swcnt Disksmentioning

confidence: 97%

“…A debundling process to open the ends of the tubes was therefore necessary prior to bucky paper production by filtration. Surfactant (or organic solvent [25]) treatment and ultrasonic processes [24] can aid the . Volume of eluent: DD-disk system, methanol, 15 mL; ENVI™-18 DSK disk, methanol, 7 m; Empore™ activated carbon disk, methylene chloride, 80 mL homogenization of the particles, reduce bundle size and enhance the external area of the SWCNTs, as shown by the experiment of Zheng et al [22].…”

Section: Swcnt Disksmentioning

confidence: 99%

A new solid-phase extraction disk based on a sheet of single-walled carbon nanotubes

et al. 2008

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A new kind of solid-phase extraction disk based on a sheet of single-walled carbon nanotubes (SWCNTs) is developed in this study. The properties of such disks are tested, and different disks showed satisfactory reproducibility. One liter of aqueous solution can pass through the disk within 10-100 min while still allowing good recoveries. Two disks (DD-disk) can be stacked to enrich phthalate esters, bisphenol A (BPA), 4-n-nonylphenol (4-NP), 4-tert-octylphenol (4-OP) and chlorophenols from various volumes of solution. The results show that SWCNT disks have high extraction ability for all analytes. The SWCNT disk can extract polar chlorophenols more efficiently than a C 18 disk from water solution. Unlike the activated carbon disk, analytes adsorbed by the new disks can be eluted completely with 8-15 mL of methanol or acetonitrile. Finally, the DD-disk system is used to pretreat 1000-mL real-world water samples spiked with BPA, 4-OP and 4-NP. Detection limits of 7, 25, and 38 ng L −1 for BPA, 4-OP, and 4-NP, respectively, were achieved under optimized conditions. The advantages of this new disk include its strong adsorption ability, its high flow rate and its easy preparation.

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Pore structure of raw and purified HiPco single-walled carbon nanotubes

Cited by 221 publications

References 15 publications

Carbon Nanotube-Based Sensors

Carbon Nanotube-Based Sensors

Carbon Nanotubes for Electronic and Electrochemical Detection of Biomolecules

A new solid-phase extraction disk based on a sheet of single-walled carbon nanotubes

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