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X-ray absorption anomaly of well-characterized multiwall carbon nanotubes
- Source :
- Carbon. 145:209-217
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- We studied X-ray absorption of multiwall carbon nanotube (MWCNT) produced by the chemical vapor deposition method using ethanol and benzene precursors at 1473 K with X-ray absorption fine structure in order to obtain a new designing direction for X-ray shielding fabrics. Acid oxidation and thermal annealing further treated the MWCNTs. The energy dependence of X-ray absorptivity of MWCNTs was efficiently used to remove the effect of the metallic impurity contribution, to elucidate the relationship between X-ray mass attenuation coefficient and the structure of MWCNT. The thermal annealing treatment at 2773 K was the most effective method to increase the crystallinity and to remove the impurities of MWCNTs. The acid and oxidation treated MWCNT induced not only the surface structure difference between MWCNT and highly oriented pyrolytic graphite (HOPG) but also the addition of surface oxygen related functional groups from those treatments, which influence the mass attenuation coefficient (μ/ρ). The X-ray absorptivity of heat treated E-MWCNT and B-MWCNT at 2773 K was close to that of HOPG indicating that those MWCNTs have a well-ordered crystal structure, quite similar to HOPG. On the other hand, E-MWCNT having a less-crystalline surface structure showed larger X-ray absorptivity than HOPG by about 9%.
- Subjects :
- Materials science
02 engineering and technology
General Chemistry
Carbon nanotube
Chemical vapor deposition
Molar absorptivity
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
law.invention
Crystallinity
Highly oriented pyrolytic graphite
Chemical engineering
Impurity
law
General Materials Science
Mass attenuation coefficient
0210 nano-technology
Absorption (electromagnetic radiation)
Subjects
Details
- ISSN :
- 00086223
- Volume :
- 145
- Database :
- OpenAIRE
- Journal :
- Carbon
- Accession number :
- edsair.doi...........fe3fb4ec88a177a6d7379c48d1e720fe