Differences in the catalyst removal from single- and double-walled carbon nanotubes

Jang, Jae Won; Lee, Kyu Won; Lee, Cheol Eui; Kim, Bawl; Lee, Cheol Jin

doi:10.1016/j.cap.2013.02.018

Cited by 9 publications

(3 citation statements)

References 31 publications

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“…For example, refluxing nitric acid is a common purification method of as-produced CNTs. 9,10 Metal catalysts and some amorphous carbons can be removed by nitric acid treatments. Also, nitric acid is known to induce ptype doping due to intercalation of NO 3 − ions.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In preparing CNT networks or films, nitric acid is often used in various stages. For example, refluxing nitric acid is a common purification method of as-produced CNTs. , Metal catalysts and some amorphous carbons can be removed by nitric acid treatments. Also, nitric acid is known to induce p-type doping due to intercalation of NO 3 – ions. , Such chemical doping is used to control optical absorption and electrical conductivity of CNT TCEs. − The doping effect of nitric acid has been studied with Raman, XPS, optical absorption, and IV transport measurements which reveal almost complete bleaching of first and second interband transitions for semiconducting CNTs and enhancement of conductivity in CNT TCEs.…”

Section: Introductionmentioning

confidence: 99%

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Local Electrical Investigations of Nitric Acid Treatment Effects on Carbon Nanotube Networks

Jeong

Park

2015

J. Phys. Chem. C

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Nitric acid is a commonly used chemical in preparing and functionalizing carbon nanotube (CNT) networks. It is also used to enhance the conductivity of CNT-based networks or films, which is usually attributed to ptype doping by NO 3 − ions. We used local electrical characterization methods based on atomic force microscopy to elucidate the effects of nitric acid treatments on sparse and random CNT networks. IV characteristics of CNT network devices before and after nitric acid treatments are obtained along with local electrical characteristics with both scanning gate microscopy and electrostatic force microscopy. Our results show both p-type doping of CNTs and reduction of CNT−CNT junction resistances after nitric acid treatments.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Local Electrical Investigations of Nitric Acid Treatment Effects on Carbon Nanotube Networks

Jeong

Park

2015

J. Phys. Chem. C

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“…several Gauss, with g of 2.003 is expected. EPR has been often used to highlight the efficiency of catalyst removal [44,45]. Spectra recorded in air and under vacuum being similar, no interaction with paramagnetic O 2 occurs that must result in changes on linewidth and intensity.…”

Section: Materials Structure and Compositionmentioning

confidence: 99%

Chlorinated holey double-walled carbon nanotubes for relative humidity sensors

Bulusheva

Sysoev

Lobiak

et al. 2019

Carbon

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a b s t r a c tA chemical procedure for modification of double walled carbon nanotubes (DWCNTs) to enhance their response to humidity was developed. The DWCNTs walls were etched by hot concentrated sulfuric acid, after what the edge carbon sites were saturated by chlorine via reaction with CCl 4 vapor. This treatment increases the dispersibility of DWCNTs in solvents, removes oxygen groups, and produces chlorine decorated holes in the outer walls. Networks of chlorinated holey DWCNTs showed a high repeatable response to humid environment and a good reversible behavior after the sensor purging by dry air. The density functional theory calculations predict enhanced polarization of the DWCNTs when they contain chlorine decorated holes in the outer walls and physisorption of H 2 O molecules near chlorine atoms. These two effects are the cause of an intense low noise signal to gaseous H 2 O and easy sensor recovery.

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Synthesis and comparison of different spinel ferrites and their catalytic activity during chemical vapor deposition of polymorphic nanocarbons

Dhand

Mittal

Rhee

et al. 2017

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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Differences in the catalyst removal from single- and double-walled carbon nanotubes

Cited by 9 publications

References 31 publications

Local Electrical Investigations of Nitric Acid Treatment Effects on Carbon Nanotube Networks

Local Electrical Investigations of Nitric Acid Treatment Effects on Carbon Nanotube Networks

Chlorinated holey double-walled carbon nanotubes for relative humidity sensors

Synthesis and comparison of different spinel ferrites and their catalytic activity during chemical vapor deposition of polymorphic nanocarbons

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