IDs:

180

Authors : Biró,L.,P.;Horváth,Z.,E.;Koós,A.,A.;Osváth,Z.;Vértesy,Z.;Darabont,Al.;Kertész,K.;Neamtu,C.;Sárközi,Zs.;Tapasztó,L.
Title : Direct synthesis of multi-walled and single-walled carbon nanotubes by spray-pyrolysis
JournalName : Journal of Optoelectronics and Advanced Materials
PubDateYear : 2003
PubDateOther :
Volume : 5
Issue :
StartPage : 661
EndPage : 666
Keywords : Carbon nanotubes;Spray-pyrolysis;Ferrocene catalyst;TEM;STM
Notes :
Abstract : In the present paper we report the simultaneous synthesis of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) by spray-pyrolysis, a type of chemical vapour deposition (CVD) method. The technical characteristics of the home-made experimental set-up are given. The synthesis involves the spray-pyrolysis of ferrocene (Fe(C5H5)2) in benzene (C6H6) solution in Ar atmosphere. The effects of the following characteristic parameters of the spray-pyrolysis process were studied: the temperature in the reaction tube, the ferrocene concentration, and the flow-rate of the ferrocene-benzene solution. The obtained samples (carbonaceous material deposited on the walls of the reaction tube) were analysed by Transmission Electron Microscopy (TEM) and Scanning Tunneling Microscopy (STM). From the obtained TEM and STM images we concluded that the best values of the studied parameters, regarding both the quality and quantity of the as grown carbon nanotubes, are: (i) ferrocene concentration - 3 g ferrocene in 50 ml benzene; (ii) flowrate of the ferrocene-benzene solution � 1 ml/min; (iii) reaction tube temperature in the 875� 925 C range.
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