Synthesis of SBA-16 Supported Catalyst for CNTs and Dispersion Study of CNTs in Polypyrrole Composite
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Synthesis of SBA-16 Supported Catalyst for CNTs and Dispersion Study of CNTs in Polypyrrole Composite Tajamal Hussain*1, Adnan Mujahid1, Khurram Shehzad2, Asma Tufail Shah3, Rehana Kousar1 1
Institute of Chemistry, University of the Punjab. Lahore-54590, Pakistan
2
Center for Nano and Micro Mechanics, Tsinghua University, Beijing-100084, China
3
Interdisciplinary Research Centre in Biomedical Materials, COMSATS Institute of Information Technology, Lahore-54000, Pakistan *[email protected] ABSTRACT In last two decades, huge amount of research work has been contributed in the field of nanochemistry particularly for synthesis, characterization and applications of carbon nanotubes (CNTs). For synthesis of CNTs through chemical vapor deposition (CVD), supported metal catalyst is used preferentially. In view of that, SBA-16 supported nanoprticles of Iron, Fe/SBA16, were prepared. To have Fe/SBA-16, adsorption of Fe nanoparticles on SBA-16 have been accomplished by reduction of ferrous ion on the surface of SBA-16. Afterwards, CNTs were synthesized by CVD using benzene as precursor over Fe/SBA-16 nanocatalyst. Synthesis of CNTs was carried out at 750oC with ambient pressure. Synthesized CNTs were functionalized by treating the them with a mixture of H2SO4/HNO3. As a result of this acidic treatment, carboxylic functional group was introduced on the surface of CNTs due to oxidation. As such prepared and functionalized CNTs were, further, used as filler in the synthesis of polymer nanocomposites of polypyrrol(PPY), matrix. These nanocomposites were prepared by in situ polymerization. Thus, electrical conductivity is measured for both types of polymer composites. On their comparison, important information regarding dispersion of CNT in the matrix are extracted. INTRODUCTION Synthesis of CNTs, remarkable man made material as far as its electrical and mechanical properties are concerned, using CVD is very common because it is economical and required less sophisticated instrumentation [1-2]. CVD is also recommended for having good yield of CNTs. In CVD, pyrolysis of hydrocarbon, precursor, are done in the presence of suit able metal catalyst in inert environment. Various types of catalyst have been used for the synthesis of CNTs [3-4]. Selection of metal catalyst is very crucial since morphology and yield of the CNTs mainly depend upon catalyst. But for synthesis of CNTs using CVD, template assisted metal nanocatalysts have received increasing attention in past time [5-6]. Supported or template assisted metal catalysts are quite encouraging since desired shape as well as size of the metal nanocatalyst can be achieved. Such types of catalyst are also famous for giving high yield when
used for CNTs synthesis. In present work, SBA-16 supported Fe nanoparticles have been synthesized. Through reduction of ferrous ions, iron got adsorbed as nanoparticles on the surface of SBA-16. Moreover, CNTs prepared through CVD, using Fe/SBA-16 as catalyst, were undergone oxidation to create carboxylic group on the surface of CNT
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