A spectroscopic study on surface and structural transitions of carbon nanotubes under different atmospheres

The structural transitions of carbon nanotubes (CNTs) demonstrated under air, Ar, and mixed H2/Ar atmospheres using Raman spectroscopy, which related to C–C stretching on graphene layers.

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Studying of Structural Changes of Graphene Layers of Carbon Nanotubes Functionalized by Raman Spectroscopy

Liquid Crystals and their Application ◽

10.18083/lcappl.2017.4.83 ◽

2017 ◽

Vol 17 (4) ◽

pp. 83-89

Author(s):

T. P. Dyachkova ◽

A. V. Rukhov ◽

E. N. Tugolukov ◽

N. V. Usol'tseva ◽

Yu. A. Khan ◽

...

Keyword(s):

Carbon Nanotubes ◽

Raman Spectroscopy ◽

Structural Changes ◽

Graphene Layers

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Raman spectroscopy as a probe of graphene and carbon nanotubes

Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rsta.2007.2155 ◽

2007 ◽

Vol 366 (1863) ◽

pp. 231-236 ◽

Cited By ~ 100

Author(s):

M.S Dresselhaus ◽

G Dresselhaus ◽

M Hofmann

Keyword(s):

Carbon Nanotubes ◽

Raman Spectroscopy ◽

Doping Level ◽

Graphene Layers ◽

Spectroscopy Research

Progress in the use of Raman spectroscopy to characterize graphene samples for the number of graphene layers and doping level they contain is briefly reviewed. Comparisons to prior studies on graphites and carbon nanotubes are used for inspiration to define future promising directions for Raman spectroscopy research on few layer graphenes.

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Effect of Size of Multiwalled Carbon Nanotubes Dispersed in Gear Oils for Improvement of Tribological Properties

Advances in Tribology ◽

10.1155/2018/2328108 ◽

2018 ◽

Vol 2018 ◽

pp. 1-13 ◽

Cited By ~ 1

Author(s):

Kodanda Rama Rao Chebattina ◽

V. Srinivas ◽

N. Mohan Rao

Keyword(s):

Carbon Nanotubes ◽

Raman Spectroscopy ◽

Ball Milling ◽

Multiwalled Carbon Nanotubes ◽

Tribological Properties ◽

Extreme Pressure ◽

Multiwalled Carbon ◽

Pristine Mwcnts ◽

Gear Oil ◽

The Stability

The aim of the paper is to investigate the effect of size of multiwalled carbon nanotubes (MWCNTs) as additives for dispersion in gear oil to improve the tribological properties. Since long pristine MWCNTs tend to form clusters compromising dispersion stability, they are mildly processed in a ball mill to shorten the length and stabilized with a surfactant before dispersing in lubricant. Investigations are made to assess the effect of ball milling on the size and structure of MWCNTs using electron microscopy and Raman spectroscopy. The long and shortened MWCNTs are dispersed in EP 140 gear oil in 0.5% weight. The stability of the dispersed multiwalled carbon nanotubes is evaluated using light scattering techniques. The antiwear, antifriction, and extreme pressure properties of test oils are evaluated on a four-ball wear tester. It is found that ball milling of MWCNTs has a strong effect on the stability and tribological properties of the lubricant. From Raman spectroscopy, it is found that ball milling time of up to 10 hours did not produce any defects on the surface of MWCNTs. The stability of the lubricant and the antiwear, antifriction, and extreme pressure properties have improved significantly with dispersion shortened MWCNTs. Ball milling for longer periods produces defects on the surface of MWCNTs reducing their advantage as oil additives.

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Manipulating the surface-enhanced Raman spectroscopy (SERS) activity and plasmon-driven catalytic efficiency by the control of Ag NP/graphene layers under optical excitation

Nanophotonics ◽

10.1515/nanoph-2020-0644 ◽

2021 ◽

Vol 10 (5) ◽

pp. 1529-1540

Author(s):

Xianwu Xiu ◽

Liping Hou ◽

Jing Yu ◽

Shouzhen Jiang ◽

Chonghui Li ◽

...

Keyword(s):

Raman Spectroscopy ◽

Hot Spot ◽

Catalytic Efficiency ◽

Surface Enhanced Raman Spectroscopy ◽

In Situ Monitoring ◽

Excitation Beam ◽

Graphene Layers ◽

Cu Film ◽

Surface Enhanced ◽

Surface Enhanced Raman

Abstract Highly efficient plasmon-driven catalysis and excellent surface-enhanced Raman spectroscopy (SERS) performance are proportional to the square of the local electromagnetic field (hot spot). However, a proven way to realize the enhancement in intensity and density of “hot spot” still needs to be investigated. Here, we report on multilayered Ag nanoparticle (Ag NP)/graphene coupled to an underlying Cu film system (MAgNP-CuF) which can be used as an effective SERS substrates realizing ultra-sensitive detection for toxic molecules and in situ monitoring the plasmon-driven reaction for p-nitrothiophenol (PNTP) to p,p′-dimercaptobenzene (DMAB) conversion. The mechanism of ultra-sensitive SERS response and catalytic reaction is investigated via Ag NP/graphene layer-dependent experiments combined with theoretical simulations. The research found that the intensity and density of “hot spot” can be effectively manipulated by the number of plasmonic layers, and the bottom Cu film could also reflect the scattered and excitation beam and would further enhance the Raman signals. Moreover, the MAgNP-CuF exhibits outstanding performance in stability and reproducibility. We believe that this concept of multilayered plasmonic structures would be widely used not only in the field of SERS but also in the wider research in photocatalysis.

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Detection of Carbon Nanotubes using Tip-Enhanced Raman Spectroscopy

Electronic Properties of Carbon Nanotubes ◽

10.5772/17325 ◽

2011 ◽

Cited By ~ 2

Author(s):

Jia Wang ◽

Xiaobin Wu ◽

Rui Wang ◽

Mingqian Zhang

Keyword(s):

Carbon Nanotubes ◽

Raman Spectroscopy ◽

Tip Enhanced Raman Spectroscopy

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Improved hydrothermal synthesis of MoS2 sheathed carbon nanotubes

Chemical Papers ◽

10.2478/s11696-012-0227-2 ◽

2012 ◽

Vol 66 (12) ◽

Cited By ~ 3

Author(s):

Jaciel Robles-Nuñez ◽

Fernando Chiñas-Castillo ◽

Manuel Sanchez-Rubio ◽

Javier Lara-Romero ◽

Rafael Huirache-Acuña ◽

...

Keyword(s):

Carbon Nanotubes ◽

Raman Spectroscopy ◽

Hydrothermal Synthesis ◽

Reaction Temperature ◽

High Yield ◽

Hydrothermal Route ◽

Simple Process ◽

Toxic Materials ◽

Resultant Material ◽

Full Body

AbstractMoS2 sheathed carbon nanotubes have been successfully synthesized using a hydrothermal route under controlled conditions. The resultant material was studied by XRD, EDS, HRTEM, and Raman spectroscopy. Advantages of the preparation presented here compared to other methods are: a) lower reaction temperature, b) high yield of sheathed nanotubes including ends and full body, c) simple process with non-toxic materials, and d) no damage inflicted to nanotubes.

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Carbon Nanotube-Induced Planarization of Conjugated Polymers in Solution

MRS Proceedings ◽

10.1557/proc-858-hh12.4 ◽

2004 ◽

Vol 858 ◽

Cited By ~ 1

Author(s):

Jian Chen ◽

Rajagopal Ramasubramaniam ◽

Haiying Liu

Keyword(s):

Carbon Nanotubes ◽

Carbon Nanotube ◽

Conjugated Polymers ◽

Spectroscopic Study ◽

Surface Quality ◽

Hybrid Materials ◽

Conjugated Polymer ◽

Visible Absorption ◽

The Impact ◽

Conformational Interaction

ABSTRACTThe understanding of the conformational interaction between conjugated polymers and carbon nanotubes in solution is essential to develop the applications of carbon nanotubes, particularly conjugated polymer-carbon nanotube hybrid materials. The visible absorption spectroscopic study shows that curved carbon nanotube surfaces can induce the planarization of individual conjugated polymers such as poly(p-phenyleneethynylene)s and poly(3-alkylthiophene)s in solution. The impact of nanotube surface quality on the interaction between carbon nanotubes and conjugated polymers is investigated.

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