Construction of apparatus for production of carbon nanotubes (CNTs)

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dc.contributor.authorSenevirathna, K.L.C.D.
dc.contributor.authorKumarasinghe, A.R.
dc.date.accessioned2022-02-14T10:13:49Z
dc.date.available2022-02-14T10:13:49Z
dc.date.issued2015
dc.description.abstractCarbon nanotubes (CNTs) are rolled up cylinders of graphene sheets [1]. There are two main types of of carbon nanotubes, namely, multi-walled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs) [2]. The unique nearly one dimensional structure of CNTs results in many attractive properties, which has led to many interesting applications. There are mainly three major techniques to produce CNTs. They are arc discharge, chemical vapor deposition (CCVD) and laser ablation. Though scientists are researching more economic ways to produce these structures, CNTs produced using different techniques have different properties. Due to inexpensiveness and being able to perform even in open air, arc-discharge technique has attracted attention in the production of CNT. In arc discharge, a vapor is created by an arc discharge between two carbon electrodes with or without a catalyst. Nanotubes self-assemble from the resulting carbon vapor. Both SWCNT and MWCNTs can easily be obtained by this technique simply by with or without the inclusion of a metal catalyst particle into anode. However, although arc-discharge produces large quantity of CNTs, the product is contaminated with other carbon materials, hence requiring lots of purification. Further nanotubes tend to be short with random sizes and direction when produced via arc-discharge route. In this work, we describe the development of apparatus for arc-discharge to produce CNTs using carbon electrodes made using high purity a rare variety of natural vein graphite. Methodology In order to produce carbon nanotubes, the first step is the construction of arc-discharging set-up. Here we describe the construction of an arc-discharge unit at UWU using home-built parts. The Instrument consists of mainly three parts. First part is the vacuum chamber. Second parts are the cathode and anode holders. Anode holder is fixed in position and the cathode holder can move up and down (or back and forth) by using a stepper motor. Another main part is the control unit. Control unit controls the steeper motor which drives the two electrodes in a controlled manner inside the vacuum. Next important step is the preparation of rod shaped graphite from > 99% pure as-received vain graphite lumps followed by purification of carbon nanotubes and characterizing those using suitable techniques such as SEM, TEM and Raman.en_US
dc.identifier.isbn9789550481088
dc.identifier.urihttp://www.erepo.lib.uwu.ac.lk/bitstream/handle/123456789/8342/12-SCT-Construction%20of%20apparatus%20for%20production%20of%20carbon%20nanotubes%20.pdf?sequence=1&isAllowed=y
dc.language.isoenen_US
dc.publisherUva Wellassa University of Sri Lankaen_US
dc.subjectScience and Technologyen_US
dc.subjectTechnologyen_US
dc.subjectMineral Sciencesen_US
dc.subjectRubber Productionen_US
dc.subjectMaterials Sciencesen_US
dc.titleConstruction of apparatus for production of carbon nanotubes (CNTs)en_US
dc.title.alternativeResearch Symposium 2015en_US
dc.typeOtheren_US
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