Measurements of CNT Forest Self-Assembly from In-situ ESEM Synthesis
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2024
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| author | Surya, Ramakrishna Koerner, Gordon L. Hajilounezhad, Taher Safavigerdin, Kaveh Calyam, Prasad Bunyak, Filiz Palaniappan, Kannappan Maschmann, Matthew R. |
| author_facet | Surya, Ramakrishna Koerner, Gordon L. Hajilounezhad, Taher Safavigerdin, Kaveh Calyam, Prasad Bunyak, Filiz Palaniappan, Kannappan Maschmann, Matthew R. |
| contents | Understanding the dynamic self-assembly mechanisms of carbon nanotube (CNT) forests is necessary to advance their technological promise. Here, in-situ environmental scanning electron microscope (ESEM) chemical vapor deposition (CVD) synthesis observes the real-time nucleation, assembly, delamination, and self-termination of dense ($>$ 10$^9$ CNT/cm$^2$), tall ($>$ 100 $μ$m) CNT forests in real time. Forest synthesis is continuously observed from nucleation to self-termination. Assembly forces generated near the substrate detach CNTs from the substrate, which simulation suggests requires approximately 10 nN of tensile force. Delamination initiates at both the CNT-catalyst and the catalyst-substrate interfaces, indicating multiple delamination mechanism. Digital image correlation applied to SEM image sequences measures time-invariant strain within growing forests, indicating that forests grow as rigid bodies after liftoff. The Meta CoTracker algorithm measured CNT growth rates reduce from 50 nm/sec to full termination over 150 seconds. This work provides a robust strategy to observe and measure CVD material synthesis in-situ using ESEM. The method is uniquely suited to observe population-based phenomena at both nanometer spatial resolution and at a highly scalable field of view. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_19336 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Measurements of CNT Forest Self-Assembly from In-situ ESEM Synthesis Surya, Ramakrishna Koerner, Gordon L. Hajilounezhad, Taher Safavigerdin, Kaveh Calyam, Prasad Bunyak, Filiz Palaniappan, Kannappan Maschmann, Matthew R. Applied Physics Materials Science Understanding the dynamic self-assembly mechanisms of carbon nanotube (CNT) forests is necessary to advance their technological promise. Here, in-situ environmental scanning electron microscope (ESEM) chemical vapor deposition (CVD) synthesis observes the real-time nucleation, assembly, delamination, and self-termination of dense ($>$ 10$^9$ CNT/cm$^2$), tall ($>$ 100 $μ$m) CNT forests in real time. Forest synthesis is continuously observed from nucleation to self-termination. Assembly forces generated near the substrate detach CNTs from the substrate, which simulation suggests requires approximately 10 nN of tensile force. Delamination initiates at both the CNT-catalyst and the catalyst-substrate interfaces, indicating multiple delamination mechanism. Digital image correlation applied to SEM image sequences measures time-invariant strain within growing forests, indicating that forests grow as rigid bodies after liftoff. The Meta CoTracker algorithm measured CNT growth rates reduce from 50 nm/sec to full termination over 150 seconds. This work provides a robust strategy to observe and measure CVD material synthesis in-situ using ESEM. The method is uniquely suited to observe population-based phenomena at both nanometer spatial resolution and at a highly scalable field of view. |
| title | Measurements of CNT Forest Self-Assembly from In-situ ESEM Synthesis |
| topic | Applied Physics Materials Science |
| url | https://arxiv.org/abs/2402.19336 |