Palizdar Meghdad, Ahgababazadeh Roya, Mirhabibi Alireza, Brydson Rik, Pilehvari Shima
Centre of Excellence for Advanced Materials and Processing (CEAMP), Iran University of Science and Technology (lUST), 16844 Tehran, Iran.
J Nanosci Nanotechnol. 2011 Jun;11(6):5345-51. doi: 10.1166/jnn.2011.3787.
Carbon nanotubes have been grown by the catalytic chemical vapour deposition (CCVD) method using an Fe catalyst supported on MgO. The influence of using either pure MgO or Mg(NO3)2 x 6H2O as the source of the MgO catalyst support as well as the effects of varying the Fe metal loading on the support has been investigated. The catalyst was prepared at room temperature by the wet impregnation method from a mixture of Fe2(SO4)3 x xH2O and either MgO or Mg(NO3)2 x 6H2O in aqueous solution; the weight percent of Fe/MgO was varied between 5, 10, and 15. Preparation of CNTs was carried out in a horizontal furnace at 900 degrees C under methane gas with flow rate of 6 litres/min. The supported catalysts and carbon nanotubes (CNTs) were investigated by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Diffraction pattern (XRD) and Fourier Transform (FT)-Raman spectroscopy. Results revealed that the number of nanotubes was maximised by using MgO as a support precursor instead of Mg(NO3)2 x 6H2O and also by increasing the amount of Fe.
采用负载于氧化镁上的铁催化剂，通过催化化学气相沉积（CCVD）法生长碳纳米管。研究了使用纯氧化镁或Mg(NO₃)₂·6H₂O作为氧化镁催化剂载体的来源的影响，以及改变载体上铁金属负载量的影响。催化剂在室温下通过湿浸渍法由Fe₂(SO₄)₃·xH₂O与氧化镁或Mg(NO₃)₂·6H₂O在水溶液中的混合物制备；Fe/MgO的重量百分比在5%、10%和15%之间变化。碳纳米管的制备在水平炉中于900℃、甲烷气体流速为6升/分钟的条件下进行。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射图谱（XRD）和傅里叶变换（FT）-拉曼光谱对负载型催化剂和碳纳米管（CNT）进行了研究。结果表明，使用氧化镁作为载体前驱体而非Mg(NO₃)₂·6H₂O以及增加铁的含量，可使纳米管的数量最大化
