Park, Ji Hong Park, Junbeom Lee, Sung-Hyun Kim, Seung Min 2024-01-19T16:01:56Z 2024-01-19T16:01:56Z 2021-09-05 2020-12 1976-4251 https://pubs.kist.re.kr/handle/201004/117739 Continuous synthesis of high-crystalline carbon nanotubes (CNTs) is achieved by reconfiguring the injection part in the reactor that is used in the floating catalyst chemical vapor deposition (FC-CVD) process. The degree of gas mixing is divided into three cases by adjusting the configuration of the injection part: Case 1: most-delayed gas mixing (reference experiment), Case 2: earlier gas mixing than Case 1, Case 3: earliest gas mixing. The optimal synthesis condition is obtained using design of experiment (DOE) in the design of Case 1, and then is applied to the other cases to compare the synthesis results. In all cases, the experiments are performed by varying the timing of gas mixing while keeping the synthesis conditions constant. Production rate (Case 1: 0.63 mg/min, Case 2: 0.68 mg/min, Case 3: 1.29 mg/min) and carbon content (Case 1: 39.6 wt%, Case 2: 57.1 wt%, Case 3: 71.6 wt%) increase as the gas-mixing level increases. The amount of by-products decreases stepwise as the gas-mixing level increases. TheI(G)/I(D)ratio increases by a factor of 7 from 10.3 (Case 1) to 71.7 (Case 3) as the gas-mixing level increases; a high ratio indicates high-crystalline CNTs. The radial breathing mode (RBM) peak of Raman spectrograph is the narrowest and sharpest in Case 3; this result suggests that the diameter of the synthesized CNTs is the most uniform in Case 3. This study demonstrates the importance of configuration of the injection part of the reactor for CNT synthesis using FC-CVD. English 한국탄소학회 Continuous synthesis of high-crystalline carbon nanotubes by controlling the configuration of the injection part in the floating catalyst chemical vapor deposition process Article 10.1007/s42823-020-00131-3 1 Carbon Letters, v.30, no.6, pp.613 - 619 Carbon Letters 30 6 613 619 N scie scopus kci ART002695629 000560965200001 2-s2.0-85081032154 Chemistry, Multidisciplinary Materials Science, Multidisciplinary Chemistry Materials Science Article FIBERS Carbon nanotube (CNT) Synthesis Gas mixing Floating catalyst chemical vapor deposition