Sorry, you need to enable JavaScript to visit this website.

Carbon nanostructures produced by an AC Arc discharge

TitoloCarbon nanostructures produced by an AC Arc discharge
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2010
AutoriAntisari, M.V., Mirabile Gattia Daniele, Brandão L., Marazzi R., and Montone Amelia
RivistaMaterials Science Forum
Volume638-642
Paginazione1766-1771
ISBN Number0878492941; 9780878492947
ISSN02555476
Parole chiaveAC arc discharge, Alternating current, Arc discharge, Carbon nanomaterials, Carbon Nanostructures, Carbon nanotubes, Carbon soot, Cavity resonators, Compact structures, Current voltage characteristics, Direct current, Electric discharges, Electron microscopes, Electrons, Field emission, Field emission scanning electron microscopes, Graphene, Graphene sheets, Graphite, Graphite electrodes, High frequency, High-resolution transmission electron microscopes, Low frequency, Mechanism of formation, Nanostructures, Power frequency, Research fields, Scanning electron microscopy, Single Wall, Single-wall structures, Synthesis (chemical), Transition metals, Transmission electron microscopy
Abstract

Carbon nanostructures are under deep investigation due their peculiar properties and possible applications. In particular, development of new methods for the synthesis of these materials and their mechanism of formation represent interesting research fields. Arc discharge allows to produce different forms of carbon nanostructures. The parameters involved in the process, voltage, current density, type and pressure of the surrounding gas can be controlled especially for achieving high quantity of material with enhanced characteristics in terms of purity while the use of transition metal-graphite mixtures has been used to produce single wall structures. Moreover direct current (DC) and alternating current (AC) are suitable for producing carbon nanomaterials, but different results can be obtained. In this work the effect of the power frequency in an AC arc discharge technique on the synthesis of carbon nanostructures is reported. Pure graphite electrodes have been arched in air in an homemade apparatus where the material can be collected directly on a cylindrical collector fixed near the arc. In order to avoid the formation of deposits under the arc a symmetrical configuration of the electrodes has been set. The production of carbon soot containing Single Wall Nanohorns (SWNH) and highly convoluted graphene sheets is optimized. The range of power frequencies 32-1000Hz has been investigated and the arcs have been ignited fixing the voltage at 28 V. The materials has been analyzed by field emission scanning electron microscope and high resolution transmission electron microscope. The microstructure of the material synthesized by this apparatus is affected by the power frequency, as the experimental results demonstrate. The samples produced at low frequency presented high amounts of single wall structures, SWNH-type. More compact structures, similar to large onion-like structures, have been found in samples synthesized at high frequency values. © (2010) Trans Tech Publications.

Note

cited By 5; Conference of 6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009 ; Conference Date: 25 August 2009 Through 29 August 2009; Conference Code:79243

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-75849142607&doi=10.4028%2fwww.scientific.net%2fMSF.638-642.1766&partnerID=40&md5=05977012b01ef1e807eab253589c38af
DOI10.4028/www.scientific.net/MSF.638-642.1766
Citation KeyAntisari20101766