Physical Methods for the Preparation of Cobalt Nanoparticles for Use in the Synthesis of Multiwalled Carbon Nanotubes
The aim of this work was to obtain cobalt nanoparticles through a physical method, which could be formed simultaneously during the Catalytic Chemical Vapour Deposition (CCVD) synthesis of carbon nanotubes, under conditions suitable for both carbon nanotube synthesis and Co-nanoparticle formation. Co...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
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| Series: | Inorganics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6740/13/1/7 |
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| Summary: | The aim of this work was to obtain cobalt nanoparticles through a physical method, which could be formed simultaneously during the Catalytic Chemical Vapour Deposition (CCVD) synthesis of carbon nanotubes, under conditions suitable for both carbon nanotube synthesis and Co-nanoparticle formation. Co nanoparticles were prepared by Physical Vapour Deposition (PVD) using a 0.05 m<sup>3</sup> magnetron on two different substrates, SiO<sub>2</sub>/Si and C, followed by a reduction treatment in an H<sub>2</sub> atmosphere. Transmission Electron Microscopy (TEM) and Field Enhanced Scanning Electron Microscopy (FE-SEM) were used to characterize the Co nanoparticles. On the SiO<sub>2</sub>/Si substrate, cobalt silicate is formed, which stabilizes the Co nanoparticles, while the nanoparticles obtained on the C-substrate are sometimes surrounded by a layer of Co<sub>3</sub>O<sub>4</sub>, which deactivates the cobalt nanoparticles. To obtain suitable Co nanoparticles for carbon nanotube synthesis, the optimal Co-layer thickness is between 20 and 30 Å, and the optimal reduction temperature is 800 °C and 450 °C for SiO<sub>2</sub>/Si and C substrates, respectively. |
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| ISSN: | 2304-6740 |