Resonance Raman Study of ${\hbox{I}}_{2}$-Intercalated Single-Walled Carbon Nanotubes

Nguyen, Van Minh; Yang, In Sang; Jung, YunJae; Kim, Sungjin; Oh, Jihyun; Yi, Whikun

doi:10.1109/tnano.2006.886784

Cited by 3 publications

(4 citation statements)

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“…15 While Grigorian et al interpreted Raman peaks of I-SWNT at 175 and 109 cm -1 as the vibration modes of negatively charged polyiodide ions, 5 the present I-SWNT sample prepared by vapor-phase reaction does not exhibit any resonance of the Raman peak at 174 cm -1 with a 647.1 nm laser. 11 The photoluminescence spectrum of I-SWNT indicates that the phonon mode of polyiodide should be resonant with this excitation source. 16 In this regard, this Raman peak was assigned as a radial breathing mode of the pristine SWNT, not as a stretching vibration of I 3or I 5molecule.…”

Section: Resultsmentioning

confidence: 99%

“…Alternatively, iodine can be intercalated through a vapor-phase reaction . For this sample, a micro-Raman spectroscopic study has also been carried out to investigate the variation of lattice vibrations depending on excitation wavelength . In order to quantitatively estimate the degree of electron transfer between iodine and the SWNT, we have adopted I L I -edge X-ray absorption near-edge structure (XANES) analysis, because the intensity of a characteristic resonance peak in this spectrum can provide a straightforward and quantitative measure for the oxidation state of iodine.…”

Section: Introductionmentioning

confidence: 99%

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Spectroscopic Evidence on Weak Electron Transfer from Intercalated Iodine Molecules to Single-Walled Carbon Nanotubes

2007

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The chemical bonding character of iodine-intercalated single-walled carbon nanotube (I−SWNT) has been systematically investigated with combinative X-ray spectroscopies. According to I LI-edge X-ray absorption near-edge structure (XANES) analysis, a white line peak corresponding to 2s → 5p transition shows nearly identical but slightly stronger intensity for the I−SWNT than for neutral iodine, indicative of a weak electron transfer from intercalated iodine to SWNT. In contrast, there are remarkable spectral differences in the I LI-edge XANES spectra of I−SWNT and iodine-intercalated Bi2Sr2CaCu2O y . This allows us to rule out the possibility of negatively charged polyiodide ions in the present I−SWNT sample prepared by vapor-phase reaction. Also, we have found that a contact between iodine and SWNT during the synthesis has negligible influence on the chemical bonding nature of intercalated iodine species. The electron transfer from iodine to SWNT is further supported by C 1s X-ray photoelectron spectroscopy revealing the reduction of carbon in SWNT upon iodine intercalation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spectroscopic Evidence on Weak Electron Transfer from Intercalated Iodine Molecules to Single-Walled Carbon Nanotubes

2007

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“…(5) Using the micropipette to inlay CNTs/isopropanol onto glass sheets which are arranged in a rectangular (3 × 20 mm 2 ) pattern with polyimide tape to rearrange CNTs. Because the cost of making electrode pattern with polyimide tape is low, the electrodes with various shapes and sizes can be conveniently designed [32] . Because the concentration of CNTs/isopropanol is constant, the amount of CNTs used to make CFS could be controlled by the volume of micropipette.…”

Section: The Chemical Vapor Deposition Methodsmentioning

confidence: 99%

“…Compared with SWCNTs, the advantage of MWCNTs is that they can carry more catalysts, because there are sandwiches between the layers of car-bon atoms that make up the MWCNTs, which can store additional materials. Nevertheless, the uniformity and stability of MWCNTs are not as good as that of SWCNTs, because of the van der Waals force between each layer of carbon atoms, which will weaken the bonding force between each layer of carbon atoms and further interfere with the stability of MW-CNTs [32] .…”

Section: The Structure and Characterization Of Cntsmentioning

confidence: 99%

Preparation and application of carbon nanotubes flexible sensors

Feng

Líu

et al. 2019

J. Semicond.

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Based on the good extensibility and conductivity, the flexible sensors (FSs) have a wide range of applications in the field of the electrochemical energy storage and variable stress sensors, which causes that the preparation of FSs also become a hot spot of research. Among the materials for preparing the FSs, the flexible carbon matrix composites (FCMCs) have become the widely used material since the good performance in the properties of electrochemistry and mechanics, which could be divided into three types: the carbon nanofibers (CNFs), the carbon nanospheres (CNSs) and the carbon nanotubes (CNTs). Compared with CNFs and CNSs, the CNTs wrapped by the polydimethylsiloxane (PDMS) have the advantages of the excellent extensibility and electrochemical stability. Therefore, the CNTs flexible sensor (CFS) could be well used in the field of the FSs. The purpose of this review is summarizing the preparation methods and application fields of CFS and proposing the research direction of CFS in the future. In this paper, two methods for fabricating the CFS have been designed by consulting the methods mentioned in the literature in recent years, and the advantages and disadvantages between the two methods have been explained. The application fields of CFS in recent years are enumerated, and the conclusion that the application fields of CFS are very wide is drawn. At the end of this paper, the review concludes with an overview of key remaining challenges in the application fields of the CFS.

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Tuning of hole doping level of iodine-encapsulated single-walled carbon nanotubes by temperature adjustment

Wang

Shi

et al. 2008

Chem. Commun.

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Resonance Raman Study of ${\hbox{I}}_{2}$-Intercalated Single-Walled Carbon Nanotubes

Cited by 3 publications

References 10 publications

Spectroscopic Evidence on Weak Electron Transfer from Intercalated Iodine Molecules to Single-Walled Carbon Nanotubes

Spectroscopic Evidence on Weak Electron Transfer from Intercalated Iodine Molecules to Single-Walled Carbon Nanotubes

Preparation and application of carbon nanotubes flexible sensors

Tuning of hole doping level of iodine-encapsulated single-walled carbon nanotubes by temperature adjustment

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