Structural Analysis and Electrical Property of Acid‐Treated MWCNT

ABSTRACT The electrical properties of acid‐treated CNT were investigated in terms of functional group and microstructure. A mixture of HNO3 and H2SO4 was used to acid treatment of CNT, and acid‐treated CNTs were synthesized by the mixture for 0 to 5 h. In crystal structure analysis, as acid treatmen...

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Bibliographic Details
Published in:Surface and interface analysis 2024-12, Vol.56 (12), p.851-857
Main Authors: Lee, Jaekwang, Lim, Hyunwoo, Ha, Joo‐yeon, Lee, Seungjae, Lee, Heesoo
Format: Article
Language:English
Subjects:
Acid resistance
acid treatment
Acids
Atomic properties
Atomic structure
carbon nanotube
Crystal defects
Crystal lattices
Crystal structure
Electrical properties
Electrical resistivity
functional group
Functional groups
Mixtures
Raman spectroscopy
sheet resistance
Structural analysis
structural defect
Sulfuric acid
X ray photoelectron spectroscopy
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Summary:ABSTRACT The electrical properties of acid‐treated CNT were investigated in terms of functional group and microstructure. A mixture of HNO3 and H2SO4 was used to acid treatment of CNT, and acid‐treated CNTs were synthesized by the mixture for 0 to 5 h. In crystal structure analysis, as acid treatment time was increased, the intensity of graphite diffraction peak was decreased and shifted to lower angle. It indicates a decrease in the crystallinity of CNT surface and lattice contraction by loss of carbon atoms. The distribution of oxygen on CNT surface was observed by TEM analysis confirming that functional groups and structural defects were formed. ID/IG ratio and average distance between defects (LD) were calculated using Raman spectroscopy to analyze the structural characteristics of CNT, and the greatest decrease was identified from p‐CNT to 2h‐CNT, resulting in the formation of functional groups and the changes in structural defects on CNT surface by acid treatment in the initial stage. Bonding state on CNT surface was analyzed through XPS analysis, and functional groups such as CO and COH were confirmed in acid‐treated CNT. Sheet resistance was measured to analyze the electrical properties of CNT, and 3h‐CNT showed the lowest sheet resistance at 25.28 Ω.
ISSN:0142-2421
1096-9918
DOI:10.1002/sia.7353