Phonon properties in different types of single-walled carbon nanotube thin films probed by Raman spectroscopy

Dużyńska, Anna; Świniarski, Michał; Wróblewska, Anna; Łapińska, Anna; Żerańska-Chudek, Klaudia; Judek, Jarosław; Zdrojek, Mariusz

doi:10.1016/j.carbon.2016.04.064

Cited by 25 publications

(15 citation statements)

References 40 publications

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“…It is worth to mention that the magnitude and the direction (upward or downward) of the G-band shifts strongly depend on the CNT diameter (Inset Fig.2 The Raman G-bands are very sensitive not only to charge transfer but also to different environmental effects such as temperature [28,29], strain [28,30,31] and pressure [32]. However, these effects shift the G + band in the same direction independently on the CNT diameter, unlike the results displayed on figure 3.…”

Section: Hybrid Systems With Semiconducting Nanotubesmentioning

confidence: 86%

Fermi level shift in carbon nanotubes by dye confinement

Almadori

Delport

Chambard

et al. 2019

Carbon

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Dye confinement into carbon nanotube significantly affects the electronic charge density distribution of the final hybrid system. Using the electron-phonon coupling sensitivity of the Raman G-band, we quantify experimentally how charge transfer from thiophene oligomers to single walled carbon nanotube is modulated by the diameter of the nano-container and its metallic or semiconducting character. This charge transfer is shown to restore the electron-phonon coupling into defected metallic nanotubes. For sub-nanometer diameter tube, an electron transfer optically activated is observed when the excitation energy matches the HOMO-LUMO transition of the confined oligothiophene. This electron doping accounts for an important enhancement of the photoluminescence intensity up to a factor of nearly six for optimal confinement configuration. This electron transfer shifts the Fermi level, acting on the photoluminescence efficiency. Therefore, thiophene oligomer encapsulation allows modulating the electronic structure and then the optical properties of the hybrid system.

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Section: Hybrid Systems With Semiconducting Nanotubesmentioning

confidence: 86%

Fermi level shift in carbon nanotubes by dye confinement

Almadori

Delport

Chambard

et al. 2019

Carbon

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“…Examinations of thermal conductivity of SWCNT film and determination of the temperature for which it reaches the maximum value were performed by Duzynska and Zdrojek et al [72][73][74]. They obtained an SWCNT film and then examined the impact of elevated temperature on changes in thermal conductivity using Raman spectroscopy.…”

Section: Impact Of Temperaturementioning

confidence: 99%

Thermal conductivity of carbon nanotube networks: a review

2019

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Depending on their structure and order (individual, films, bundled, buckypapers, etc.), carbon nanotubes (CNTs) demonstrate different values of thermal conductivity, from the level of thermal insulation with the thermal conductivity of 0.1 W/mK to such high values as 6600 W/mK. This review article concentrates on analyzing the articles on thermal conductivity of CNT networks. It describes various measurement methods, such as the 3-x method, bolometric, steady-state method and their variations, hot-disk method, laser flash analysis, thermoreflectance method and Raman spectroscopy, and summarizes the results obtained using those techniques. The article provides the main factors affecting the value of thermal conductivity, such as CNT density, number of defects in their structure, CNT ordering within arrays, direction of measurement in relation to their length, temperature of measurement and type of CNTs. The practical methods of using CNT networks and the potential directions of future research in that scope were also described.

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“…The evolution of several Raman parameters revealed structuring of the samples under heating. Duzynska et al . studied the phonon properties of single‐walled carbon nanotube thin films monitoring the Raman spectra under a linear heating program, aiming the understanding of thermal properties and heat dissipation of the materials.…”

Section: Introductionmentioning

confidence: 99%

Temperature Programmed Oxidation Coupled with In Situ Techniques Reveal the Nature and Location of Coke Deposited on a Ni/La₂O₃‐αAl₂O₃ Catalyst in the Steam Reforming of Bio‐oil

et al. 2018

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The characterization of coke deposited on a Ni/La2O3‐αAl2O3 catalyst used in the steam reforming of bio‐oil has been studied by temperature programmed oxidation (TPO) coupled with different in situ techniques: thermogravimetry (TG), modulated thermogravimetry (MTG), FTIR spectroscopy with mass spectrometry (MS), Raman spectroscopy, and differential scanning calorimetry (DSC). The steam reforming of bio‐oil was carried out in a reactor equipment with two steps in series, comprising bio‐oil thermal treatment (500 °C) and subsequent reforming in a fluidized bed reactor (550–700 °C; and steam‐to‐carbon ratio, 1.5–6). TG/MS‐TPO experiments identify encapsulating and filamentous coke, and a more detailed analysis using other in situ techniques enable to characterize the nature and location of 4 types of coke: (i) an encapsulating coke with aliphatic nature placed in the most superficial layers; (ii) an encapsulating coke with higher aromatic nature in inner layers; (iii) the most superficial layers of a filamentous coke, further from active sites and with a more carbonized structure compared to encapsulating coke; and (iv) an innermost and mainly polyaromatic filamentous coke with a low oxygenates content.

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Phonon properties in different types of single-walled carbon nanotube thin films probed by Raman spectroscopy

Cited by 25 publications

References 40 publications

Fermi level shift in carbon nanotubes by dye confinement

Fermi level shift in carbon nanotubes by dye confinement

Thermal conductivity of carbon nanotube networks: a review

Temperature Programmed Oxidation Coupled with In Situ Techniques Reveal the Nature and Location of Coke Deposited on a Ni/La₂O₃‐αAl₂O₃ Catalyst in the Steam Reforming of Bio‐oil

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Phonon properties in different types of single-walled carbon nanotube thin films probed by Raman spectroscopy

Cited by 25 publications

References 40 publications

Fermi level shift in carbon nanotubes by dye confinement

Fermi level shift in carbon nanotubes by dye confinement

Thermal conductivity of carbon nanotube networks: a review

Temperature Programmed Oxidation Coupled with In Situ Techniques Reveal the Nature and Location of Coke Deposited on a Ni/La2O3‐αAl2O3 Catalyst in the Steam Reforming of Bio‐oil

Contact Info

Product

Resources

About

Temperature Programmed Oxidation Coupled with In Situ Techniques Reveal the Nature and Location of Coke Deposited on a Ni/La₂O₃‐αAl₂O₃ Catalyst in the Steam Reforming of Bio‐oil