Raman spectroscopic characterization of submicron vapor-grown carbon fibers and carbon nanofibers obtained by pyrolyzing hydrocarbons

1999 ◽  
Vol 14 (12) ◽  
pp. 4474-4477 ◽  
Author(s):  
M. Endo ◽  
K. Nishimura ◽  
Y. A. Kim ◽  
K. Hakamada ◽  
T. Matushita ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Raman Spectroscopy ◽  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Spectroscopic Characterization ◽  
Treatment Temperature ◽  
Two Dimensional ◽  
Raman Spectroscopic ◽  
Main Transition

Variations of the properties of submicron vapor-grown carbon fibers (VGCFs) and nanofibers, with diameters around 0.1–0.2 μm and 80–100 nm, respectively, are observed by Raman spectroscopy as a function of heat-treatment temperature. The microstructural evolution strongly depends on the original properties of the material, such that the main transition temperatures associated with the onset for establishing two-dimensional graphene ordering are defined below 1500 °C for the nanofibers and 2000 °C for the submicron VGCFs, respectively. The relative intensities (ID/IG) of the as-grown phase for submicron VGCFs and nanofibers are 3.44 and 1.35, while those for the corresponding graphitized samples are 0.393 and 0.497, respectively.

Raman Spectroscopic Characterization of Carbon Nanofibers Obtained by Using Metal Chloride as Catalyst Precursor

2007 ◽  
Vol 561-565 ◽  
pp. 1387-1390
Author(s):  
Fei Li ◽  
Xiao Ping Zou ◽  
Jin Cheng ◽  
Hong Dan Zhang ◽  
Peng Fei Ren ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Carbon Nanofibers ◽  
Amorphous Carbon ◽  
Spectroscopic Characterization ◽  
Copper Plate ◽  
Metal Chloride ◽  
Catalyst Precursor ◽  
Raman Spectroscopic ◽  
Degree Of Graphitization

Carbon nanofibers have been obtained by the interaction of ethanol with metal chloride over copper plate. Different metal chloride was used as the catalyst precursor. The products were characterized by the Raman spectroscopy for the degree of graphitization. The relative intensities and the amount of amorphous carbon were estimated. The results indicate that the catalyst precursor has effects on the degree of graphitization of carbon nanofibers.

scholarly journals Raman spectroscopic characterization of selenite reduction by the bacterium Azospirillum thiophilum in the presence of an increased concentration of sulphate

2020 ◽  
Author(s):  
A. A. Vladimirova ◽  
A. A. Kamnev ◽  
A. V. Tugarova
Keyword(s):  
Raman Spectroscopy ◽  
Spectroscopic Characterization ◽  
Selenite Reduction ◽  
Raman Spectroscopic

In the biomass of A. thiophilum BV-S grown in the presence of 7 mM Na2SO4, Raman spectroscopy showed a peak at 348 cm–1 (Se–S bond) in addition to a peak at 250 cm–1 (amorphous modification of Se).

Raman Spectroscopic Characterization of Melanoma and Benign Melanocytic Lesions Suspected of Melanoma Using High-Wavenumber Raman Spectroscopy

2016 ◽  
Vol 88 (15) ◽  
pp. 7683-7688 ◽  
Author(s):  
Inês P. Santos ◽  
Peter J. Caspers ◽  
Tom C. Bakker Schut ◽  
Remco van Doorn ◽  
Vincent Noordhoek Hegt ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Spectroscopic Characterization ◽  
Raman Spectroscopic ◽  
Melanocytic Lesions

Near-infrared Raman spectroscopy for assessing biochemical changes of cervical tissue associated with precarcinogenic transformation

The Analyst ◽  
2014 ◽  
Vol 139 (21) ◽  
pp. 5379-5386 ◽  
Author(s):  
Shiyamala Duraipandian ◽  
Jianhua Mo ◽  
Wei Zheng ◽  
Zhiwei Huang
Keyword(s):  
Raman Spectroscopy ◽  
Near Infrared ◽  
Spectroscopic Characterization ◽  
Biochemical Changes ◽  
Cervical Tissue ◽  
Raman Spectroscopic

NIR Raman spectroscopic characterization of cervical precarcinogenic transformation.

Raman Spectroscopy Studies on the Microstructure Evolution from Cellulose to Carbon Fiber

2014 ◽  
Vol 789 ◽  
pp. 157-162
Author(s):  
Gui Zhi Ren ◽  
Yong Ju Zang ◽  
Ning Wang ◽  
Li Hui Deng ◽  
Cong Jie Chen ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Raman Spectroscopy ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Microstructure Evolution ◽  
Treatment Process ◽  
Treatment Temperature ◽  
Fiber Structure ◽  
Dry Process ◽  
Spectroscopy Studies

Microstructure evolution of cellulose-based carbon fibers during the heat-treatment process of pyrolysis and carbonization was studied by Raman spectroscopy. The characteristic peaks of cellulose fibers were weakened after a dry process at 100°C and absolutely disappeared after the pyrolysis temperature reached 150°C. For intermediates obtained in the temperature of 150-1300°C, two characteristic Raman peaks appeared at ~1360cm-1 and ~1580cm-1, meaning a transition state structure of carbon hexagonal plane started to form. Parameters including ID1’/IG’, ID2’/IG’ and ID3’/IG’ of the intermediates treated in the temperature of 150-1300°C were compared. All the parameters firstly decreased with the increasing heat treatment temperature until a maximum at ~400°C,and then the parameters decreased until the structure turned into a carbon fiber structure at 1300°C.

scholarly journals Structural Characterization of Boron-doped Submicron Vapor-grown Carbon Fibers and Their Anode Performance

2000 ◽  
Vol 15 (6) ◽  
pp. 1303-1313 ◽  
Author(s):  
K. Nishimura ◽  
Y. A. Kim ◽  
T. Matushita ◽  
T. Hayashi ◽  
M. Endo ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Carbon Fibers ◽  
Coulombic Efficiency ◽  
Structural Evolution ◽  
Treatment Temperature ◽  
X Ray ◽  
Boron Doped ◽  
Tilt Boundaries ◽  
Synthetic Graphite

Structural evolution of undoped and boron-doped submicron vapor-grown carbon fibers (S-VGCFs) was monitored as a function of heat-treatment temperature (HTT). Based on x-ray and Raman data, over the range of HTT from 1800 to 2600 °C, it was found that boron atoms act as catalysts to promote graphitization due to boron's higher diffusivity. For the range of HTT from 2600 to 2800 °C, the process of boron out-diffusion from the host material induces defects, such as tilt boundaries; this process would be related with the improved capacity and Coulombic efficiency of boron-doped S-VGCFs. When 10 wt% S-VGCFs was used as an additive to synthetic graphite, the cyclic efficiency of the capacities was improved to almost 100%.

Spotting the differences in two-dimensional materials – the Raman scattering perspective

2018 ◽  
Vol 47 (9) ◽  
pp. 3217-3240 ◽  
Author(s):  
Shishu Zhang ◽  
Na Zhang ◽  
Yan Zhao ◽  
Ting Cheng ◽  
Xiaobo Li ◽  
...  
Keyword(s):  
Raman Scattering ◽  
2D Materials ◽  
Spectroscopic Characterization ◽  
Two Dimensional ◽  
Raman Spectroscopic ◽  
Two Dimensional Materials

This review discusses the Raman spectroscopic characterization of 2D materials with a focus on the “differences” from primitive 2D materials.

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