Highly Stabilized β‐Carotene in Carbon Nanotubes

Yanagi, Kazuhiro; Miyata, Yasumitsu; Kataura, Hiromichi

doi:10.1002/adma.200501839

Cited by 206 publications

(207 citation statements)

References 32 publications

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“…coronene, β-carotene, 9,10-dichloroanthracene, water, iodine) have been encapsulated so far. [2][3][4][5][6] Some of the eager studies on structural and electronic properties of encapsulated molecules reported that some of the encapsulated molecules showed properties different from their bulk forms. 5,[7][8][9][10] Due to such findings, it has been concluded that the tube interior provides a unique field to the encapsulated molecules to alter their properties.…”

Section: Introductionmentioning

confidence: 99%

Alkali metal ion storage properties of sulphur and phosphorous molecules encapsulated in nanometer size carbon cylindrical pores

et al. 2016

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We investigated the physical and chemical stabilities of sulfur and phosphorus molecules encapsulated in a mesoporous carbon (MPC) and two kinds of single-walled carbon nanotubes (SWCNTs) having different cylindrical pore diameters. The sublimation temperatures of sulfur molecules encapsulated in MPC and the two kinds of SWCNTs were measured by thermo-gravimetric measurements. It was found that the sublimation temperature of sulfur molecules encapsulated in SWCNTs having mean tube diameter of 1.5 nm is much higher than any other molecules encapsulated in larger pores. It was also found that the capacity fading of lithium-sulfur battery can be diminished by encapsulation of sulfur molecules in SWCNTs. We also investigated the electrochemical properties of phosphorus molecules encapsulated in SWCNTs (P@SWCNTs). It was shown that P@SWCNT can adsorb and desorb both Li and Na ions reversibly.

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Section: Introductionmentioning

confidence: 99%

Alkali metal ion storage properties of sulphur and phosphorous molecules encapsulated in nanometer size carbon cylindrical pores

et al. 2016

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“…An improved stability of species encapsulated in SWCNT was observed previously on a beta-carotene sample. [33] We assume that if some residual 6T was located outside the SWCNTs, it would be decomposed by our electrochemical treatment. Hence, the contribution from these molecules to the Raman spectra of the sample after electrochemical treatment would be negligible or absent.…”

Section: Resultsmentioning

confidence: 99%

Sexithiophene Encapsulated in a Single‐Walled Carbon Nanotube: An In Situ Raman Spectroelectrochemical Study of a Peapod Structure

Kalbáč

Kavan

Gorantla

et al. 2010

Chemistry A European J

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The interaction of single‐walled carbon nanotubes (SWCNTs) and α‐sexithiophene (6T) was studied by Raman spectroscopy and by in situ Raman spectroelectrochemistry. The encapsulation of 6T in SWCNT and its interaction causes a bleaching of its photoluminescence, and also small shifts of its Raman bands. The Raman features of the SWCNT with embedded 6T (6T‐peapods) change in both intensity and frequency compared to those of pristine SWCNT, which is a consequence of a change of the resonant condition. Electrochemical doping demonstrated that the electrode potential applied to the SWCNT wall causes changes in the embedded 6T. The effects of electrochemical charging on the Raman features of pristine SWCNT and 6T@SWCNT were compared. It is shown that the interaction of SWCNT with 6T also changes the electronic structure of SWCNT in its charged state. This change of electronic structure is demonstrated both for semiconducting and metallic tubes.

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“…The reason why the 4 peak appears only in the car SWNT spectrum has been discussed in ref. 6. Since this happened only in car SWNT, the 4 mode was conveniently used as a marker band for encapsulation.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…From the X-ray study, the average diameter of the samples ranged from 1.29 to 1.47 nm (average 1.38 nm). The method used to encapsulate -carotene inside the SWNTs is studied [6]. Briefly, -carotene (from Wako Chemicals) and SWNTs were dissolved in hexane and refluxed for 10 h in a nitrogen atmosphere.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Single-walled car bon nanotubes (SWNTs) doped with organic molecules have been investigated for applications such as controlling electrical conductivity, optical switching, and nonlinear media [1][2][3][4][5][6]. Although there are many techniques for investigating and characterizing nanoscale structures, few are feasible for molecules enclosed inside nanostructures.…”

Section: Introductionmentioning

confidence: 99%

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Structural Analysis of Encapsulated Single-Walled Carbon Nanotubes

Singh¹,

Shukla²,

Kumar³

et al. 2015

SIJSMS

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Tip-enhanced Raman spectroscopy revealed the nanoscale chemical properties of organic molecules encapsulated in single walled carbon nanotubes (SWNTsanalysis focuses is more on structural information, such as intermolecular interactions, molecular orientations, and symmetry distortions of each species. Moreover, vibrational spectroscopy can be used for identifying molecular species, which is not possible by TEM. Therefore, Raman spectroscopy is a powerful tool for studying the chemical composition of matter. Conventional confocal Raman spectroscopy techniques are limited to sub wavelength spatial resolution, and localized vibrational features of molecules encapsulated in SWNTs have not been resolved so far. This limitation has been overcome by the development of tip-enhanced Raman spectroscopy (TERS) [8][9][10][11][12][13][14][15][16]. By introducing a sharp metal tip to the focus of a laser beam, we were able to localize Raman excitation to an area of 30 nm 2 [17][18][19]. This technique has recently enabled the molecular nanoimaging of a single carbon nanotube [20] and double-stranded DNA network structures [21].

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Highly Stabilized β‐Carotene in Carbon Nanotubes

Cited by 206 publications

References 32 publications

Alkali metal ion storage properties of sulphur and phosphorous molecules encapsulated in nanometer size carbon cylindrical pores

Alkali metal ion storage properties of sulphur and phosphorous molecules encapsulated in nanometer size carbon cylindrical pores

Sexithiophene Encapsulated in a Single‐Walled Carbon Nanotube: An In Situ Raman Spectroelectrochemical Study of a Peapod Structure

Structural Analysis of Encapsulated Single-Walled Carbon Nanotubes

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