Presentation Information
[7a-P05-3]Optimization of Growth Condition of Single-Walled Carbon Nanotubes with Ruthenium Catalysts toward Narrow Chirality Distribution
〇(D)MANA SELVARAJ1 (1.Meijo Univ.)
Keywords:
Single-Walled Carbon Nanotubes (SWCNTs),Chirality Control,Ruthenium Catalyst
Controlling the chirality distribution of single-walled carbon nanotubes (SWCNTs) remains a challenge with conventional chemical vapor deposition (CVD) methods using iron-group metal catalysts such as Fe and Co. These catalysts tend to aggregate at high temperatures, leading to uneven particle sizes and broad SWCNT distributions. This study explores ruthenium (Ru), a platinum-group metal with a high melting point and strong thermal stability, as an alternative catalyst. Ru nanoparticles were uniformly deposited on SiO2/Si substrates using pulsed arc plasma deposition, with an Al2O3 support layer to prevent sintering. SWCNTs were grown in a cold-wall CVD reactor using ethanol vapor at a pressure of 100 Pa. Raman spectroscopy showed maximum SWCNT yield at 750°C. The G/D ratio decreased slightly with increasing temperature, indicating more defects at higher growth rates. Radial breathing mode (RBM) analysis revealed narrower diameter distributions (0.8 to 1.4 nm) than those obtained with Fe or Co catalysts. Ru's thermal stability helps maintain uniform nanoparticle size, enabling consistent and controlled SWCNT growth. These results highlight Ru’s potential as a catalyst for scalable and chirality-controlled SWCNT production, particularly for applications in electronics and photonics.