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Updated: Mar 17, 2026

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Co9S8 Nano/Microspheres: Characterization and Magnetic Properties
Cobalt sulfide (Co9S8) microspheres were synthesized using a solvothermal method. Annealing improved crystallinity and the sulfur-to-cobalt ratio, resulting in paramagnetic properties at room temperature.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Chemistry
Background:
- Microsphere synthesis is crucial for advanced material applications.
- Controlling morphology and crystallinity impacts material properties.
- Cobalt sulfides are investigated for magnetic and catalytic applications.
Purpose of the Study:
- To synthesize cobalt sulfide (Co9S8) microspheres.
- To investigate the effect of synthesis parameters on morphology.
- To characterize the structural, compositional, and magnetic properties of Co9S8 microspheres.
Main Methods:
- Solvothermal synthesis using triethylenetetramine (TETA) and water.
- Scanning Electron Microscopy (SEM) for morphology analysis.
- X-ray Diffraction (XRD), Energy-Dispersive X-ray Spectroscopy (EDS), and Transmission Electron Microscopy (TEM) for characterization.
- High-temperature annealing for improving crystallinity.
Main Results:
- Co9S8 microspheres with a mean diameter of 3-5 µm were successfully synthesized.
- The volume ratio of TETA to water significantly influenced microsphere morphology.
- Annealing transformed amorphous microspheres into crystalline structures.
- Annealed samples showed an increased sulfur-to-cobalt ratio.
- Co9S8 microspheres exhibited paramagnetic behavior at room temperature.
Conclusions:
- The solvothermal route offers control over Co9S8 microsphere synthesis.
- High-temperature annealing is effective for enhancing crystallinity and sulfur content.
- The synthesized Co9S8 microspheres are paramagnetic, suggesting potential applications in magnetic devices.
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