Sonochemical reaction to control the near-infrared photoluminescence properties of single-walled carbon nanotubes

Maeda, Yutaka; Konno, Yui; Nishino, Akane; Yamada, Michio; Okudaira, Saki; Miyauchi, Yuhei; Matsuda, Kazunari; Matsui, Jun; Mitsuishi, Masaya; Suzuki, Masatatsu

doi:10.1039/d0nr00271b

Cited by 15 publications

(11 citation statements)

References 42 publications

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“…The different behavior of these peaks can be explained by the lack of a significant absorption band in the red-shifted PL region. However, as it has been reported that upconversion PL is observed for functionalized SWNTs upon excitation of the quantum defects, the effects of reabsorption at the E 11 ** wavelength cannot be neglected completely. ,, …”

Section: Resultsmentioning

confidence: 99%

“…However, as it has been reported that upconversion PL is observed for functionalized SWNTs upon excitation of the quantum defects, the effects of reabsorption at the E 11 ** wavelength cannot be neglected completely. 22,24,36 It has been reported that the quantum defects of SWNTs are advantageous because they can be excited using the E 11 absorption band, which is stronger than the E 22 absorption band (see Figure S1). At low concentrations, E 11 excitation was more efficient than E 22 excitation for E 11 ** PL in H-SWNTs-xylyl (0.0315).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Helicity Sorting and Optical Resolution of Functionalized Single-Walled Carbon Nanotubes and Their Optical Properties

2020

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The helicity sorting and optical resolution of single-walled carbon nanotube (SWNT) derivatives were investigated to elucidate their fundamental properties and to fully understand their application scope. Herein, the helicity sorting and optical resolution of functionalized SWNTs (SWNTs-xylyl), which were prepared by reductive alkylation using 1,2-bis(bromomethyl)benzene, were achieved for the first time via gel chromatography using an agarose gel as the stationary phase. By applying a stepwise elution, three surfactant types (6,4) SWNTs-xylyl, (11,–5) SWNTs-xylyl, and (6,5) SWNTs-xylyl were successfully separated and characterized. The circular dichroism spectra of (11,–5) SWNTs-xylyl and (6,5) SWNTs-xylyl were mirror images of each other along the abscissa, confirming the successful enantiomeric separation of these functionalized SWNTs. Both of the SWNTs-xylyl enantiomers showed red-shifted near-infrared (NIR) photoluminescence (PL) peaks, which were assigned to quantum defects formed by the chemical modification process. The intensity of the red-shifted PL peak of SWNTs-xylyl significantly increased after the separation. Compared to the sample before the separation, the purified (6,5) SWNTs-xylyl exhibited a considerable red-shifted PL with reduced concentration quenching effects. Owing to these properties, the helicity sorting and optical resolution of functionalized SWNTs may have practical applications as efficient NIR optical materials.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Helicity Sorting and Optical Resolution of Functionalized Single-Walled Carbon Nanotubes and Their Optical Properties

2020

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“…We hypothesize that the slight increase in the I D /I G ratios may be caused by chlorine and bromine radicals addition to the SWCNTs, as these reactive species may be generated by sonolysis of the halogenated solvents 34 , 35 . Maeda et al showed that the sonication of SWCNTs in water might give oxygen-containing reactive species, which can functionalize the surface 36 . Analogously, it should be possible to form reactive halogen intermediates from the investigated halogen solvents.…”

Section: Resultsmentioning

confidence: 99%

Doping of carbon nanotubes by halogenated solvents

Taborowska

Stando

Sahlman

et al. 2022

Sci Rep

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Carbon nanotubes (CNTs) play a unique role in the area of flexible conductors as they have remarkably high electrical conductivity and bend easily without deformation. Consequently, CNTs are commonly deposited on substrates as conductive tracks/coatings. Halogenated solvents are often employed to facilitate the deposition process because they dry rapidly due to their high volatility. In this work, we report that halogenated solvents can dope CNTs considerably. The study showed that the use of dichloromethane, chloroform, or bromoform for the CNT deposition significantly impacts the chemical potential of the material, thereby modifying its charge transport characteristics. As a consequence, up to four-fold improvement in electrical conductivity is noted due to doping.

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“…[44][45][46][47] Nevertheless, designing hydrophobic dendrons as the binding sites provides a high degree of control over their direct interaction with the SWCNT surface. 48 In this study, we present polymer-dendron hybrids as modular amphiphilic agents for the suspension of SWCNTs in aqueous media. The polymer-dendron hybrids designed for this study are amphiphilic macromolecules consisting of three building blocks (Fig.…”

Section: Introductionmentioning

confidence: 99%

Dendron-Polymer Hybrids as Tailorable Coronae of Single-Walled Carbon Nanotube

Wulf¹,

Slor²,

Rathee³

et al. 2021

Preprint

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Single-walled carbon nanotubes (SWCNTs), non-covalently functionalized by synthetic polymers, find widespread applications including sensing and imaging. Identifying new amphiphiles with interchangeable building blocks that can form unique coronae around the SWCNT, customized for a specific application, is thus of great interest. We present polymer-dendron hybrids, composed of hydrophobic dendrons and hydrophilic polyethylene glycol (PEG), as amphiphilic macromolecules with high degree of structural freedom, for suspending SWCNTs in aqeous solution. Based on a set of four PEG-dendrons differing in their dendritic end-groups, we show thst differences in the chemical structure of the hydrophobic end-groups control the interactions of the PEG-dendrons with the SWCNT-surface. These interactions led to differences in the intrinsic near-infrared fluorescence emission of the SWCNTs and affected the PEG-dendron susceptibility to enzymatic degradation, which was monitored by the SWCNT fluorescent signal. Our findings open new avenues for rational design of SWCNT functionalization, and optical sensing of enzymatic activity<br>

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Sonochemical reaction to control the near-infrared photoluminescence properties of single-walled carbon nanotubes

Abstract: A simple one-step operation to control the PL properties of SWNTs by ultrasonic irradiation was developed with an appropriate surfactant under the optimized conditions of the irradiation time, SWNT concentration, and reaction atmosphere.

Cited by 15 publications

References 42 publications

Helicity Sorting and Optical Resolution of Functionalized Single-Walled Carbon Nanotubes and Their Optical Properties

Helicity Sorting and Optical Resolution of Functionalized Single-Walled Carbon Nanotubes and Their Optical Properties

Doping of carbon nanotubes by halogenated solvents

Dendron-Polymer Hybrids as Tailorable Coronae of Single-Walled Carbon Nanotube

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