Growth of super long vertically aligned carbon nanotube arrays from cyclohexane via floating catalyst method
-
摘要: 采用非芳香烃类环己烷作为碳源，通过浮游法实现了超长垂直碳纳米管(Carbon nanotube, CNT) 阵列的生长。研究表明：浮游催化过程中反应温度、催化剂前体补给速度、进料速度、生长气氛等因素对CNT阵列的生长影响显著。在直径为25 mm的石英反应器中，反应温度、催化剂前体二茂铁的补给速度、碳源环己烷的补给速度、反应气氛分别控制在820℃、0.24mg/min、0.12mL/min、640mL/min(H2/Ar=1∶15)的生长窗口内，实现了CNT阵列的快速协同生长。在单因素考察的基础上，通过对宏观参数的调变，可以制备出长度达5.0mm的CNT阵列。所获得的CNT取向一致，长径比大于105，纯度达到96.7％。Abstract: Vertically aligned carbon nanotube (VACNT) arrays were obtained using the floating catalyst method with cyclohexane as a carbon source. Results indicated that various factors, such as growth temperature, ferrocene feed rate, feed rate of the solution (ferrocene dissolved in cyclohexane), and composition of carrier gases, had a great effect on the VACNT array growth. A maximum growth rate of the VACNT array was obtained in a quartz tubular reactor with a diameter of 25mm when the growth temperature was 820℃, ferrocene feed rate 0.24mg/min, feed rate of the solution 0.12mL/min, and the flow rate of the H2/Ar (1∶15) carrier gas 640mL/min. A VACNT array with a height of 5.0mm was obtained with a large aspect ratio (>105) and a high purity (96.7%).
-
点击查看大图
计量
- 文章访问数: 1984
- HTML全文浏览量: 34
- PDF下载量: 1433
- 被引次数: 0
下载:
