Structural Study of Sulfur-Added Carbon Nanohorns

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Nanostructured carbons (NCs) possess unique properties for diverse applications.
• Heteroatom doping enhances NC properties.
• Carbon nanohorns (CNHs) are a class of nanostructured carbons with potential.

Purpose of the Study:

• To synthesize and characterize sulfur-added carbon nanohorns (S-CNH).
• To investigate the effect of synthesis parameters on S-CNH properties.
• To understand the role of sulfur in modifying carbon nanostructure.

Main Methods:

• Modified chemical vapor deposition (m-CVD) using toluene and thiophene.
• Optimization of synthesis temperature and carrier gas flow rates.
• Characterization using high-resolution scanning/transmission electron microscopy (SEM/TEM), X-ray diffraction (XRD), and X-ray microanalysis.

Main Results:

• Successfully synthesized hollow, horn-type S-CNH (1-3 µm length, 50-200 nm diameter).
• Observed distinct rough outer and smooth inner carbon layers, attributed to sulfur-induced defects.
• Identified iron as a catalyst for growth and formation of iron sulfide.

Conclusions:

• Sulfur doping modifies the surface texture and properties of carbon nanohorns.
• S-CNH synthesis is controllable via m-CVD parameters.
• The findings suggest potential for S-CNH in advanced material applications.