Abdulkareem A S, Afolabi A S, Iyuke S E, Vz Pienaar H C
School of Chemical and Metallurgical Engineering, Faculty of Engineering and the Built Environment, University of the Witwatersrand, P/Bag X3 Wits 2050 Johannesburg, South Africa.
J Nanosci Nanotechnol. 2007 Sep;7(9):3233-8. doi: 10.1166/jnn.2007.685.
A series of developments have been made in synthesizing Carbon Nanotubes (CNTs) by Catalytic Vapour Deposition (CVD) methods since its discovery as a possible route to the large scale and high quality production of CNTs. In this study, CNTs were synthesized continuously in a swirled floating catalytic chemical vapour deposition reactor using acetylene as carbon source, ferrocene as catalyst, with argon and hydrogen as carrier gases within the temperature range of 900-1050 degrees C. The effects of pyrolysis temperature, acetylene flow rate, hydrogen flow rate, and ratio of flow of acetylene to hydrogen on the rate of production of CNTs were investigated. The CNTs produced were purified with dilute nitric acid and the nature and quality of the CNTs were analysed by TEM, Raman spectrometer, EDX, and TGA. Results obtained revealed that a mixture of single and multi wall carbon nanotubes were produced continuously with a maximum yield rate of 0.31 g/min at 1000 degrees C and a flow ratio of acetylene to hydrogen of one to five.
自从发现催化气相沉积（CVD）方法可能是大规模、高质量生产碳纳米管（CNT）的途径以来，在通过该方法合成碳纳米管方面已经取得了一系列进展。在本研究中，在一个旋流浮动催化化学气相沉积反应器中，以乙炔为碳源、二茂铁为催化剂，氩气和氢气为载气，在900 - 1050摄氏度的温度范围内连续合成碳纳米管。研究了热解温度、乙炔流速、氢气流速以及乙炔与氢气流速比等因素对碳纳米管生成速率的影响。所制备的碳纳米管用稀硝酸进行纯化，并通过透射电子显微镜（TEM）、拉曼光谱仪、能谱仪（EDX）和热重分析仪（TGA）对碳纳米管的性质和质量进行分析。所得结果表明，连续制备出了单壁和多壁碳纳米管的混合物，在1000摄氏度、乙炔与氢气流速比为1:5时，最大产率为0.31克/分钟。
