Microwave arcing induced formation and growth mechanisms of core/shell metal/carbon nanoparticles in organic solutions
Microwave arcing induced formation and growth mechanisms of core/shell metal/carbon nanoparticles in organic solutions
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DOI：
10.1002/adfm.200701407
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发表时间：
2008-07-23
影响因子：
19
通讯作者：
Hwu, Jih Ru
中科院分区：
文献类型：
--
作者：
Hsin, Yu-Lin;Lin, Chia-Fen;Hwu, Jih Ru
通过新颖的微波弧形过程，在含有Fe（CO）5-C60/70的甲苯溶液中形成了良好图形化的核/壳铁/碳纳米颗粒（Fe@CNP）。当封装在石墨烯壳内部时，在室温下发现高温Y-FE相在室温下是稳定的。在没有C60/70的情况下，石墨烯壳的结构很差。在甲苯-C60/70溶液中，将合成前的CO纳米颗粒用作石墨烯壳生长的模板。通过酸蚀刻和去除中心核心纳米颗粒，可以获得空心的碳纳米颗粒。通过聚焦微波辐射进行进一步的热力退火，导致将小核/壳金属/碳纳米颗粒合并为大的核心，以及将人体中心立方体（Bee）A-FE转换为面向中心的立方体（费用）Y-FE。讨论了核/壳金属/碳纳米颗粒的可能生长机制。
Well-graphitized core/shell iron/carbon nanoparticles (Fe@CNPs) were formed in toluene solutions containing Fe(CO)5-C60/70 via an novel microwave arcing process. High temperature y-Fe phase was found to be stable at room temperature when encapsulated inside graphene shells. In the absence Of C60/70, the structures of graphene shells are poor. Pre-synthesized Co nanoparticles were used as templates for the growth of graphene shells in toluene-C60/70 solutions. Via acid etching and removal of the central core Co nanoparticles, hollow carbon nanoparticles could be obtained. Further thermal annealing by focused microwave irradiation leads to merging of small core/shell metal/carbon nanoparticles into large ones, as well as conversion of body centered cubic (bee) a-Fe to face centered cubic (fee) y-Fe. The possible growth mechanisms of core/shell metal/carbon nanoparticles were discussed.