Raman Spectroscopy Study of Carbon Nanotubes Prepared at Different Deposition Temperature Using Camphor Oil as a Precursor

The aim of this study is to engage a basic understanding of the information micro-Raman spectroscopy may yield when this characterization tool is applied to carbon nanotubes. All collective vibrations that occur in crystals can be viewed as the superposition of plane waves, called phonons, that virtually propagate to infinity. The two dominant Raman features are the radial breathing mode at low frequencies, the tangential G band and the D band multi-feature at higher frequencies. Carbon nanotubes (CNT) were formed by double furnace chemical vapor deposition. This method was based on the pyrolysis of liquid aerosols containing hydrocarbons as carbon source (camphor oil), ferrocene as the catalyst source and nitrogen as the carrier gas. The samples were prepared by placing the carbon precursor on the alumina boat into the first furnace which contains the catalyst source at different alumina boat heated at 200 °C and passed through the deposition furnace. The deposition furnace was heated at 500-900°C for 1 hour depositing CNT without annealing treatment. Then, the samples were characterized using micro-Raman spectrometer obtaining the carbon G and D peaks around 1580 cm1 and 1350 cm1 respectively and the image of the CNT produced were obtained from field emission scanning electron microscope and high resolution transmission electron microscope. Keywords: micro-Raman spectroscopy, Carbon nanotubes, Camphor oil

Synthesis of Carbon Nanotubes by Chemical Vapour Deposition of Camphor Oil over Ferrocene and Aluminum Isopropoxide Catalyst

The aim of this study is to engage a basic understanding of the information carbon nanotubes (CNTs) may yield when this CNTs is deposited on silicon substrate over ferrocene and aluminum isopropoxide catalyst. Several popular methods are used to produce high quality CNT such as chemical vapour deposition, arc discharge and others. Most promising method is, chemical vapour deposition (CVD), used to produce CNTs in this experiment. The carbon source and catalyst were placed at different alumina boat in furnace one (1). The silicon substrate was placed at the deposition furnace and range temperature from 700 oC to 900 oC. The G-band peaks of the CNTs appear at round 1580 cm-1 and D-band peaks appear at 1348 cm-1. Thermal analyses show the percentage of CNTs weight loss 75.12%, 86.39%, 86.54%, 87% and 92.3% respectively. FESEM images was observed to study the formation of the CNTs. The CNTs were successfully synthesized from the chemical vapour deposition method.

Growth of SiC and SiO2 Nanostructures Prepared from Rice Husk Ash Using Carbon-Metal Assisted

This work suggested the growth of SiC and SiO2nanostructures from heating of rice husk ash and carbon-metal assisted. The rice husk was boiled in 1 M hydrochloric acid solution with temperature of around 90 °C for 1 hour, and then washed in distilled water and dried under the sun. The dried acid-treated rice husk was burned in the furnace with normal air for 1 hour, then high purity SiO2was produced. The high silica ash mixed with Cu or SnO2powder and coconut shell charcoal were grounded for mixtures powder. The mixtures powder and Si substrates were placed on the alumina boat and put in the middle of furnace. The furnace was heated at high temperature under atmosphere of argon gas. The heated products and Si substrates were studied by X-rays diffraction and scanning electron microscope. The SiC and SiO2nanostructures were observed.