研究目的
Investigating the growth mechanism and structural behavior of multi-walled carbon nanotubes (MWCNTs) synthesized by arc discharge plasma under different environments and pressures.
研究成果
The study successfully grew long MWCNT structures using arc discharge plasma, with mechanisms involving fullerene formation, elongation, and growth into MWCNTs, leading to bundle formation. Background environment and pressure significantly affect MWCNT structure, with optimal growth at higher pressures in H2, Ar, and air environments. Understanding small carbon cluster formation is crucial for developing superior carbon nanotube structures.
研究不足
The study is based on ex situ analysis using electron microscopy, which may not capture real-time growth dynamics. The synthesis is limited to specific pressure ranges and environments, and the mechanisms proposed are inferred from static images rather than direct observation.
1：Experimental Design and Method Selection:
The arc discharge plasma technique was used to synthesize MWCNTs by evaporating carbon through an arc plasma between two cylindrical graphite rods in a vacuum chamber. Different ambient environments (air, Ar, H2) and background pressures (10?2 to 102 mbar) were applied. An external magnetic field was used for magnetic confinement.
2：Sample Selection and Data Sources:
Carbon nanomaterials were collected from the cathode and chamber after synthesis. Samples were analyzed using transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM).
3：List of Experimental Equipment and Materials:
Graphite rods, vacuum chamber, arc discharge setup with voltage of 12 V and current of 90 A, external magnetic field with strength of 30 mT, gases (Ar, H2, air with 70% N2).
4：2).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The chamber pressure was reduced to base pressure of 10?5 mbar before introducing gases. Arc discharge was initiated by contacting anode and cathode graphite rods. Carbon nanomaterials were collected and analyzed with TEM and FESEM.
5：Data Analysis Methods:
TEM and FESEM images were used to examine structural behavior and growth mechanisms of MWCNTs.
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