Mobile Iron Nanoparticle and Its Role in the Formation of SiO2 Nanotrench via Carbon Nanotube-Guided Carbothermal Reduction

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• 作者：Hye Ryung Byon ; Hee Cheul Choi
• 刊名：Nano Letters
• 出版年：2008
• 出版时间：January 2008
• 年：2008
• 卷：8
• 期：1
• 页码：178 - 182
• 全文大小：890K
• 年卷期：v.8,no.1(January 2008)
• ISSN：1530-6992

文摘

The detailed role of iron nanoparticles (NPs) involved with the formation of SiO<SUB>2 nanotrenches is revealed. The physical movements of ironNPs, such as levitation and adsorption, turn out to be responsible for the initiation of carbothermal reduction (C (carbon nanotube, s) +SiO₂(s) SiO(g) + CO(g)), which results in SiO₂ nanotrenches that are fully guided by carbon nanotubes. Under the chemical vapor depositioncondition with 0.1% of O₂ gas, iron NPs are liberally levitated from SiO₂/Si substrate then adsorbed on the sidewalls of carbon nanotubes.Depending on the numbers of iron NPs attached to carbon nanotubes, two different types of nanotrenches are determined. When multiple ironNPs are assembled on carbon nanotubes and involved in carbothermal reduction, aligned nanohole type of nanotrenches is produced (TypeI). On the contrary, when single iron NPs initiate the carbothermal reduction, nanotrenches having smooth pathways and high shoulders arecommonly formed (Type II).