Song, Hyeongyun Kim, Dong Hwan Park, Cheol Woo Jae, Jungho Hong, Seungki Lee, Jaegeun 2024-01-19T09:33:38Z 2024-01-19T09:33:38Z 2023-03-10 2023-05 1976-4251 https://pubs.kist.re.kr/handle/201004/113786 Mass production of high-quality carbon nanotubes (CNTs) remains a challenge, requiring the development of new wet-impregnated catalyst suitable for the catalytic chemical vapor deposition (CCVD) of CNTs in a fluidized bed reactor. For the successful development of a new catalyst, a highly robust system to synthesize CNTs must be established. Here, we systematically investigated the robustness of CNT synthesis by CCVD using a wet-impregnated catalyst. We statistically tested four factors that could potentially affect the robustness of CNT synthesis system, focusing on carbon yield and I-G/I-D. First, we tested the effect of vacuum baking before CNT growth. F test and CV equality test concluded that vacuum baking recipe did not significantly reduce the variability of the CNT synthesis. Second, we tested the batch-to-batch variation of catalysts. The results of t test and one-way analysis of variance indicate that there is significant difference in carbon yield and I-G/I-D among catalysts from different batches. Third, we confirmed that there is spatial non-uniformity of wet-impregnated catalysts within a batch when they are produced in large scale. Finally, we developed a multi-step heating recipe to mitigate the temperature overshooting during the CNT synthesis. The multi-step recipe increased the mean of carbon yield, but did not influence the variability of CNT synthesis. We believe that our research can contribute to the establishment of a robust CNT synthesis system and development of new wet-impregnated catalysts. English 한국탄소학회 Statistical analysis of the synthesis of carbon nanotubes using wet-impregnated catalysts for improved robustness Article 10.1007/s42823-023-00473-8 1 Carbon Letters, v.33, no.3, pp.921 - 929 Carbon Letters 33 3 921 929 N scie scopus kci ART002964469 000931752100001 2-s2.0-85147762107 Chemistry, Multidisciplinary Materials Science, Multidisciplinary Chemistry Materials Science Article CHEMICAL-VAPOR-DEPOSITION LARGE-SCALE SYNTHESIS THERMOGRAVIMETRIC ANALYSIS MASS-PRODUCTION GROWTH EVOLUTION CVD COEFFICIENTS EQUALITY FORESTS Carbon nanotubes Wet impregnation Catalyst Robustness ANOVA