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<p>Ruthenium (Ru), a period-5 platinum-group element, has a high melting point (2334&#xa0;°C) and is often used in alloy catalysts for single-walled carbon nanotube (SWCNT) growth to reduce SWCNT diameter by suppressing catalyst aggregation. However, limited number of studies have investigated SWCNT growth using monometallic Ru catalysts, which typically yield low SWCNT densities. Furthermore, the effect of an Al<sub>2</sub>O<sub>3</sub> buffer layer on SWCNT growth with Ru catalysts remains unclear, despite its common use with Fe and Co catalysts to enhance SWCNT yield. In this study, SWCNTs were synthesized via alcohol catalytic chemical vapor deposition using monometallic Ru catalysts on SiO<sub>2</sub>/Si and Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub>/Si substrates. Under optimal growth conditions, vertically aligned SWCNTs formed on both substrates, with higher yield observed on Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub>/Si substrate. Moreover, SWCNT diameters decreased on Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub>/Si, with most nanotubes measuring less than 1.4&#xa0;nm. These results demonstrate that an Al<sub>2</sub>O<sub>3</sub> buffer layer effectively enhances SWCNT yield and reduces diameters when using monometallic Ru catalysts.</p>

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Vertically aligned single-walled carbon nanotube growth via alcohol catalytic chemical vapor deposition using monometallic Ru catalysts

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Mana Selva Raj,
  • Ayaka Koda,
  • Kamal Prasad Sharma,
  • Takahiro Saida,
  • Takahiro Maruyama

摘要

Ruthenium (Ru), a period-5 platinum-group element, has a high melting point (2334 °C) and is often used in alloy catalysts for single-walled carbon nanotube (SWCNT) growth to reduce SWCNT diameter by suppressing catalyst aggregation. However, limited number of studies have investigated SWCNT growth using monometallic Ru catalysts, which typically yield low SWCNT densities. Furthermore, the effect of an Al2O3 buffer layer on SWCNT growth with Ru catalysts remains unclear, despite its common use with Fe and Co catalysts to enhance SWCNT yield. In this study, SWCNTs were synthesized via alcohol catalytic chemical vapor deposition using monometallic Ru catalysts on SiO2/Si and Al2O3/SiO2/Si substrates. Under optimal growth conditions, vertically aligned SWCNTs formed on both substrates, with higher yield observed on Al2O3/SiO2/Si substrate. Moreover, SWCNT diameters decreased on Al2O3/SiO2/Si, with most nanotubes measuring less than 1.4 nm. These results demonstrate that an Al2O3 buffer layer effectively enhances SWCNT yield and reduces diameters when using monometallic Ru catalysts.