DNA Functionalized Single-Walled Carbon Nanotubes for Electrochemical Detection

Hu, Chenguo; Zhang, Yiyi; Bao, Gang; Zhang, Yuelan; Liu, Meilin; Wang, Zhong Lin

doi:10.1021/jp0550457

Cited by 137 publications

(110 citation statements)

References 31 publications

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“…Additionally, if one chooses, oligonucleotides can be removed using small aromatic molecules such as rhodamine 6G or the complementary DNA strand, once any necessary processing is complete [99] . A variety of different applications, such as fibre spinning [102] ; self-assembled nanotube field-effect transistors [103] ; stabilization of colloidal particles [104] ; chemical sensing [105] ; and both medical diagnostic and biological fields [100,[106][107][108][109] have been investigated for DNA-dispersed SWNTs.…”

Section: Biomoleculesmentioning

confidence: 99%

Liquid‐Phase Exfoliation of Nanotubes and Graphene

Coleman

2009

Adv Funct Materials

603

536

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Many applications of carbon nanotubes require the exfoliation of the nanotubes to give individual tubes in the liquid phase. This requires the dispersion, exfoliation and stabilisation of nanotubes in a variety of liquids. In this paper we review recent work in this area, focusing on results from the author's group. We begin by reviewing stabilisation mechanisms before exploring research into the exfoliation of nanotubes in solvents, by using surfactants or biomolecules and by covalent attachment of molecules.The concentration dependence of the degree of exfoliation in each case will be highlighted. In addition we will discuss research into the dispersion mechanism for each dispersant type. Most importantly we have compared dispersion quality metrics for all dispersants. From this analysis, we conclude that functionalised nanotubes can be exfoliated to the greatest degree. Finally, we review the extension of this work to the liquid phase exfoliation of graphite to give graphene.

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Section: Biomoleculesmentioning

confidence: 99%

Liquid‐Phase Exfoliation of Nanotubes and Graphene

Coleman

2009

Adv Funct Materials

603

536

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“…In each case, the majority of objects have diameters below 3 nm. It has been suggested that ultracentrifugation removes all bundles from the dispersion, leaving a dispersion that contains only individual SWNTs (10,19,32,36). However, previous studies on DNA-SWNT dispersions have shown that small bundles remained in solution even after vigorous ultracentrifugation (16).…”

Section: Resultsmentioning

confidence: 99%

Quantitative comparison of ultracentrifuged and diluted single walled nanotube dispersions; differences in dispersion quality

Cathcart

Coleman

2009

Chemical Physics Letters

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We have carried out a quantitative comparison of the dispersion quality for ultracentrifuged and diluted surfactant-stabilised single walled nanotube dispersions.We have characterised these dispersions at a set concentration of ~30 µg.mL -1 by absorption and photoluminescence spectroscopy as well as by statistical atomic force microscopy. Both the ultracentrifuged and the diluted samples contained significant quantities of bundles as well as individual nanotubes. The ultracentrifuged sample contained ~ 4 times more individualised SWNTs than the diluted sample with partial concentrations of individual nanotubes of 4.8 and 1.1 µg.mL -1 respectively. IntroductionIn recent years, a significant amount of research has been carried out in the area of dispersion and exfoliation of single walled nanotubes (SWNTs) in the liquid phase. In general, pristine nanotubes can be dispersed in a small number of special solvents(1-5) or in a wider range of solvents, but particularly water, with the aid of third phase dispersants such as polymers(6,7), surfactants(8-11) or biomolecules like . Alternatively, nanotubes can be dispersed in super-acids(21) or by covalent functionalisation (22,23).However, the most common technique is to disperse SWNTs in water with the aid of surfactants or DNA. Ultrasonication is generally used to promote exfoliation followed by vigorous ultracentrifugation (UCF) to remove most of the bundles (10,11,19,24,25). This produces a dispersion that is significantly enriched in individual nanotubes, but at the cost of typically more than 80% of the starting nanotube mass(10). While this has been a very successful method, it is also a very inefficient one, especially given the high cost of high-quality nanotubes. An alternative to ultracentrifugation is to control the population of individual nanotubes in a dispersion by controlling nanotube concentration (1,2,4,8,12,16,26,27). This relies on the observation that nanotubes tend to debundle as the concentration is lowered. This technique is less wasteful and allows the researcher greater control over the properties of the final sample, however, highly exfoliated samples often only exist at low concentrations which limits potential applications. mg.mL -1 was shown to be the minimum SDBS-concentration necessary to obtain high fractions of dispersed nanotubes(27). Purified HiPCO SWNTs (www.cnanotech.com, Lot number PO342) were dispersed in the SDBS solution at a concentration of 1 mg.mL -1 as described elsewhere (27). Briefly, the dispersion was sonicated for 5 min with a high power sonic tip (Vibra Cell CVX; 750 W, 38%, 20 kHz), followed by 1 hr in a Branson 1510 sonic bath (frequency 42 kHz, rated power output 80 W), followed by a further 5 min under the sonic tip. Ice-water cooling was used throughout to prevent heating in the sample. The dispersion was left to stand for 24 hrs to equilibrate. It should be noted that, throughout this paper, the word concentration refers to the nanotube concentration unless otherwise stated. ACCEPTED MANUSCRIPTMild centrifugation...

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“…Taking into account the advantages of DNA and carbon nanomaterials, the combination of DNA and carbon nanomaterials offers unique advantages for different application. Hence, the combination of DNA with new carbon allotropes is a skillful and challenging area that can lead to the development of novel nano-biomaterials with exceptional properties for a variety of potential applications such as gas sensors and catalysts, as well as electronic and optical devices, sensitive biosensors, and biochips [46,47].…”

Section: Fullerene(c60)-dna Hybridmentioning

confidence: 99%

Recent Advances in Electrochemical Biosensors Based on Fullerene‐C60 Nano‐structured Platforms

Pilehvar

Wael

2017

Nanocarbons for Electroanalysis

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Nanotechnology is becoming increasingly important in the field of (bio)sensors. The performance and sensitivity of biosensors is greatly improved with the integration of nanomaterials into their construction. Since its first discovery, fullerene-C60 has been the object of extensive research. Its unique and favorable characteristics of easy chemical modification, conductivity, and electrochemical properties has led to its tremendous use in (bio)sensor applications. This paper provides a concise review of advances in fullerene-C60 research and its use as a nanomaterial for the development of biosensors. We examine the research work reported in the literature on the synthesis, functionalization, approaches to nanostructuring electrodes with fullerene, and outline some of the exciting applications in the field of (bio)sensing.

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DNA Functionalized Single-Walled Carbon Nanotubes for Electrochemical Detection

Cited by 137 publications

References 31 publications

Liquid‐Phase Exfoliation of Nanotubes and Graphene

Liquid‐Phase Exfoliation of Nanotubes and Graphene

Quantitative comparison of ultracentrifuged and diluted single walled nanotube dispersions; differences in dispersion quality

Recent Advances in Electrochemical Biosensors Based on Fullerene‐C60 Nano‐structured Platforms

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