• Morjan, Ion
• Dumitrache, Florian
• Faerber, Jaques
• Soare, Iuliana
• Alexandrescu, Rodica
• Fleaca, Claudiu
• Gavrilaflorescu, Lavinia
• Normand, François Le

Abstract

<jats:title>Abstract</jats:title><jats:p>Iron‐based core‐shell nanoparticles can present interesting catalytic properties for the growth of carbon nanostructures. We report the synthesis of various carbon nanostructures using activated chemical vapour deposition methods. These structures were analysed by Scanning Electon Microscopy (SEM) and Raman spectroscopy. Laser pyrolysis technique was used for synthesis of less than 10 nm diameter Fe‐C core‐shell catalyst nanoparticles. Acetone suspensions of Fe‐C nanoparticles were drop‐casted or spin coated onto Si(100) substrates. The consequence of hydrogen selective etching of these nanocomposites at 550 °C, followed by a treatment with a mixture of H<jats:sub>2</jats:sub> and C<jats:sub>2</jats:sub>H<jats:sub>2</jats:sub> at 700 °C (both in the presence of hot filaments) was the growth of corrugated ribbons and decorated or distorted carbon nanotubes/nanofibers. Round agglomerate nanoparticles and long and very thin nanotubes were observed on the substrates edges (protected from direct etching). By adding in similar conditions a glow discharge plasma to hot filaments, the resulted deposits contain oriented nanotubes. Due to the implication of the electric field, the presence of both plasma and hot wires seems to significantly change the specific growth conditions of carbon nanostructures towards those resulted when only incandescent filaments were used (© 2010 WILEY‐VCH Verlag GmbH &amp; Co. KGaA, Weinheim)</jats:p>

Topics

• nanoparticle
• nanocomposite
• Carbon
• scanning electron microscopy
• nanotube
• laser emission spectroscopy
• Hydrogen
• etching
• iron
• wire
• Raman spectroscopy
• chemical vapor deposition
• laser pyrolysis