BESH2005 Modeling Catalyzed Growth of Single Walled Carbon Nanotubes
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چکیده
Understanding and controlling synthesis processes are key scientific challenges which are needed to achieve significant advances in the field of nanomaterials. Single-walled carbon nanotubes (SWCNTs) have unusual physical-chemical properties that make them promising materials for a large number of innovative applications in electronics, biomedicine, micro and nano separations among others. Their structure, diameter, and degree of helicity (also known as chirality) are responsible for their specific physical-chemical behavior. SWCNTs may be synthesized by catalytic decomposition of a carbon containing species over metallic nanoparticles using chemical vapor deposition methods. Many advances have been achieved in the last decade tuning this synthesis process aiming toward products with specific properties, and there is nowadays a consensus regarding the role of the catalyst on the associated growth of specific carbon structures on its surface. In previous work we (and others) have demonstrated the existence of structural correlations between the nanocatalyst and the nascent nanotube at different growth stages. Such correlations can be dominated by either the nanotube (inverse template effect) or the nanoparticle (template effect). We have shown that achieving chirality control depends on determining synthesis conditions where crucial structural features of the nanoparticles are maintained during growth (i.e., favoring a template effect). Thus, we have advanced in understanding the factors that influence specific growth behaviors and the next challenge must be oriented toward controlling these factors via smart synthesis procedures.
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تاریخ انتشار 2016