High Resolution Capillary Electrophoresis of Carbon Nanotubes

We synthesized sub-10 nm carbon nanoparticles (CNPs) consistent with photoluminescent carbon dots (C-dots) from carbon fiber starting material. The production of different C-dots fractions was monitored over seven days. During the course of the reaction, one fraction of C-dots species with relatively high photoluminescence was short-lived, emerging during the first hour of reaction but disappearing after one day of reaction. Isolation of this species during the first hour of the reaction was crucial to obtaining higherluminescent C-dots species. When the reaction proceeded for one week, the appearance of larger nanostructures was observed over time, with lateral dimensions approaching 200 nm. The experimental evidence suggests that these larger species are formed from small C-dot nanoparticles bridged together by sulfur-based moieties between the C-dot edge groups, as if the C-dots polymerized by cross-linking the edge groups through sulfur bridges. Their size can be tailored by controlling the reaction time. Our results highlight the variety of CNP products, from sub-10 nm C-dots to $200 nm sulfur-containing carbon nanostructures, that can be produced over time during the oxidation reaction of the graphenic starting material. Our work provides a clear understanding of when to stop the oxidation reaction during the top-down production of Cdots to obtain highly photoluminescent species or a target average particle size.

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“…29 The CE of the reaction mixtures at different reaction times showed that the charge/size ratio of the species changed over time (see Fig. 4).…”

Section: Resultsmentioning

confidence: 95%

Spectroscopic Characteristics of Carbon Dots (C-Dots) Derived from Carbon Fibers and Conversion to Sulfur-Bridged C-Dots Nanosheets

et al. 2015

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“…Large aggregate spikes continue to be observed in the region containing primarily small to moderate-sized aggregates, whereas these smaller aggregates continue to appear as spikes throughout the region containing primarily isolated individual nanotubes. The potential for such overlapping behaviors was recognized in the original work on length-dependent separations 16 and will be an important problem to overcome in future CE work on carbon nanotubes. …”

Section: Discussionmentioning

confidence: 99%

Capillary Electrophoresis Separations of Bundled and Individual Carbon Nanotubes

et al. 2003

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Capillary electrophoresis (CE) has been performed on polymer-stabilized bundles and sodium dodecyl sulfate (SDS) suspensions of high-pressure carbon monoxide (HiPco)-produced single-walled carbon nanotubes. Realtime Raman spectroscopy has been used for detection and characterization of the separation process. Radialbreathing-mode vibrational frequencies are sensitive to nanotube diameter. Monitoring of these modes demonstrates the separation of poly(vinylpyrrolidone) (PVP)-stabilized tubes into fractions of differing bundle composition. Separations on SDS suspensions indicate that CE is capable of separating bundled nanotubes from isolated individuals on the basis of differences in nanotube mobility, depending on changes in diameter or bundle size.

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“…53,58,[67][68][69] It should be noted that most current techniques do not begin to address the purification of carbon nanotubes by length, diameter, and chirality, although this will clearly be of great future importance. [70][71][72] …”

Section: Electronic Structure and Chemical Reactivitymentioning

confidence: 99%

Chemistry of Single-Walled Carbon Nanotubes

et al. 2002

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In this Account we highlight the experimental evidence in favor of our view that carbon nanotubes should be considered as a new macromolecular form of carbon with unique properties and with great potential for practical applications. We show that carbon nanotubes may take on properties that are normally associated with molecular species, such as solubility in organic solvents, solutionbased chemical transformations, chromatography, and spectroscopy. It is already clear that the nascent field of nanotube chemistry will rival that of the fullerenes.

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High Resolution Capillary Electrophoresis of Carbon Nanotubes

Cited by 140 publications

References 33 publications

Spectroscopic Characteristics of Carbon Dots (C-Dots) Derived from Carbon Fibers and Conversion to Sulfur-Bridged C-Dots Nanosheets

Spectroscopic Characteristics of Carbon Dots (C-Dots) Derived from Carbon Fibers and Conversion to Sulfur-Bridged C-Dots Nanosheets

Capillary Electrophoresis Separations of Bundled and Individual Carbon Nanotubes

Chemistry of Single-Walled Carbon Nanotubes

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