We present a parametric study on the growth of carbon nanotubes (CNTs) by spray pyrolysis of a biorenewable feedstock obtained from living pine trees, namely α-pinene. The analyzed variables were the type of catalyst, catalyst concentration, flow of reactants, and reaction time; all at a fixed temperature of 800 °C. The evaluation and optimization of these parameters was performed based on the yield and crystallinity of produced CNTs which were monitored by Raman spectroscopy, thermogravimetric analysis, X-ray diffraction, and high resolution transmission electron microcopy. Ferrocene as catalyst produced highly crystalline multiwalled CNTs while Co-and Fe-phtalocyanine produced nitrogendoped CNTs. A ferrocene concentration of 37 mg/mL and 5000 sccm flow were the optimal conditions to obtain the highest yield of crystalline CNTs. The variation of time produced crystalline CNTs with different lengths without modifying their crystallinity. The growth kinetics of MWCNTs follows a Deal− Grove model which indicates that the growth is diffusion-limited and suggests that the root growth mechanism controls the growth process.
2015): Synthesis of iron sulfide films through solid-gas reaction of iron with diethyl disulfide, Journal of Sulfur Chemistry, Iron sulfide films were synthesized by the solid-gas reaction of diethyl disulfide on iron foils in the temperature range of 658-768 K using a microbalance, where the film growth kinetics followed Deal-Grove behavior. Analysis of the films by X-ray photoelectron and Raman spectroscopies as well as X-ray diffraction and scanning electron microscopy analysis revealed the formation of combined FeS/FeS 2 (troilite/pyrite) films with a sheet-like morphology at low temperatures and only FeS (troilite) films with granular morphology at higher temperatures.
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