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The effect of graphitic target density on carbon nanotube synthesis by pulsed laser ablation method
Paper ID : 1297-UFGNSM-FULL
Authors:
Fatemeh Kazemizadeh *1, Rasoul Malekfar2, mahboubeh houshiar3
1No.16, Yasaman street, Daneshjou BLV. , Velenjak, Tehran, Iran
2Atomic and Molecular Physics Group, Faculty of Basic Sciences, Tarbiat Modares University
3shahid Beheshti University
Abstract:
Carbon nanotube (CNT) was synthesized by pulsed laser ablation (PLA) of a graphitic target in vacuum chamber filled by argon gas. The effect of different condition of target preparation on the amount and quality of carbon nanotube generation was investigated. The graphite powder with 2 at% micrometer nickel (Ni) powder was mixed and packed in to a mold using a hydraulic press device at a pressure of 1000 kg/cm3. The obtained pellet that contains the mixture powder provides the carbon source for CNTs formation in PLA method. Three pellets with the pressure time of 5, 15 and 200 min was prepared. It has been shown that the time which graphitic target is under pressure is an effective parameter that can increase the amount of produced CNTs. Field emission scanning electron microscopy (FESEM) images show that if the density of graphitic target is increased by raising up the pressure time duration, CNTs can be grown even under the condition usually no nanotube can be formed. It can be due to the elimination of the distances between the graphite and catalyst gains that causes the catalysis performance improvement. The experiment was performed for nanometer cobalt ferrite (COFe2O4) together with Ni catalyst particles too. The diameter of synthesized CNPs was larger in the case of pure nickel that is related to the size of catalysts. Moreover, it was observed again that the rate of produced nanotubes is increased for high density targets, which shows that the results are independent of the type of catalyst.
Keywords:
carbon nanotube, pulsed laser ablation, synthesis
Status : Paper Accepted (Poster Presentation)