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Critical Role of the Acetylene Content and Fe/C Ratio on the Thickness and Density of Vertically Aligned Carbon Nanotubes Grown at Low Temperature by a One-Step Catalytic Chemical Vapor Deposition Process
| Content Provider | MDPI |
|---|---|
| Author | Martine, Mayne-L’Hermite Combrisson, Antoine Charon, Emeline Pinault, Mathieu Reynaud, Cécile |
| Copyright Year | 2022 |
| Description | The present work explores the role of the carbon source content and the Fe/C ratio on the synthesis of vertically aligned carbon nanotubes (VACNTs) by one-step aerosol-assisted CCVD operated at a medium temperature (615 °C) on aluminum substrates. The main objective was to overcome the limitations of VACNT growth, constituting a drawback for applications requiring thick VACNTs. By using acetylene as carbon feedstock and ferrocene as a catalyst precursor, we demonstrate that when acetylene content is reduced to 1.5 vol%, it is possible to grow VACNT carpets up to 700 µm thick while maintaining constant VACNT growth for a long duration (up to 160 min). The carbon conversion yield is significantly improved when the acetylene content reaches 1.5 vol%. The Al surface roughness also influences VACNT growth. An optimum Fe/C ratio of 0.8 wt.% coupled with a low acetylene content gives the highest growth rate (5.4 µm/min) ever reported for a thermal aerosol-assisted CCVD process operated at such a low temperature. The CNT number density can be controlled by varying the Fe/C ratio, enabling high density growth (e.g., 1.3 × $10^{11}$ $CNT/cm^{2}$). |
| Starting Page | 2338 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano12142338 |
| Journal | Nanomaterials |
| Issue Number | 14 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-07-07 |
| Access Restriction | Open |
| Subject Keyword | Nanomaterials Carbon Nanotubes Synthesis Aerosol-assisted Cvd Aluminum Substrate Growth Rate Vacnt Thickness Carbon and Iron Conversion Yield |
| Content Type | Text |
| Resource Type | Article |
