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Preparation Uniform Thin Tubular Carbon Nanofiber Using Novel Bimetallic Catalyst at Low Temperature and Its
Minki Sung1,2, Atsushi Tanaka3, Koji Nakabayashi1,4
1Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan.
ACS Omega
|September 15, 2025
Summary
Researchers developed uniform thin tubular carbon nanofibers (TCNFs) using a novel iron-manganese catalyst. This advancement in carbon nanomaterial synthesis offers potential for advanced applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Carbon nanofibers (CNFs) are crucial nanomaterials with diverse applications.
- Controlling the morphology and graphitic properties of CNFs is essential for optimizing their performance.
- Developing cost-effective and scalable synthesis methods for high-quality CNFs remains an active research area.
Purpose of the Study:
- To synthesize uniform thin tubular carbon nanofibers (TCNFs) with controlled morphology.
- To investigate the role of a novel bimetallic Fe-Mn catalyst in TCNF formation.
- To characterize the graphitic properties of the synthesized TCNFs.
Main Methods:
- Chemical vapor deposition (CVD) using a CO/H2 gas mixture.
- Utilized a novel bimetallic Fe-Mn (3:7 w/w) catalyst.
- Synthesis conducted at low temperatures (500-540 °C).
Main Results:
- Successfully prepared uniform thin tubular carbon nanofibers (TCNFs) composed of two nanofibrils (ca. 20 nm diameter).
- Demonstrated that manganese (Mn) significantly activates the iron (Fe) catalyst for selective TCNF synthesis.
- Identified that 70 wt% Mn on the Fe-Mn catalyst is optimal for uniform, duplicated CNFs with aligned tubular graphene structure.
- The resulting TCNFs exhibit high graphitic properties (interlayer spacing <0.3420 nm, stacking height >5.4 nm) due to their unique morphology.
Conclusions:
- A novel Fe-Mn bimetallic catalyst enables low-temperature synthesis of uniform TCNFs.
- The specific composition of the catalyst (70 wt% Mn) is critical for achieving desired morphology and graphitic properties.
- The synthesized TCNFs possess excellent graphitic characteristics suitable for advanced material applications.
