The Selective Heating of Iron Nanoparticles in a Single-Mode Microwave for the Patterned Growths of Carbon Nanofibers and Nanotubes
The Selective Heating of Iron Nanoparticles in a Single-Mode Microwave for the Patterned Growths of Carbon Nanofibers and Nanotubes
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DOI：
10.1002/adfm.200801720
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发表时间：
2009-04-23
影响因子：
19
通讯作者：
Schubert, Ulrich S.
中科院分区：
文献类型：
--
作者：
Druzhinina, Tamara;Weltjens, Wim;Schubert, Ulrich S.
碳纳米管的快速和廉价合成在最近的大量出版物中得到了解决。同时，微波辅助合成也引起了人们的兴趣。除了微波辐照对反应动力学有积极影响，可以采用先进的反应条件外，微波辐射的吸收取决于材料的性质，从而导致选择性加热机制。选择性加热过程允许局部产生足够高的温度来促进碳纳米纤维和纳米管的生长；在图案铁催化剂层上。所得到的纤维有微米长，可以在几分钟的短时间内合成，产生高度均匀的致密碳纤维膜。本文对表面结合铁纳米颗粒的选择性加热进行了更详细的研究，并利用自组装的n-十八烷基三氯硅烷单层提供了这种效应的实验证据，该单层作为局部高温的敏感指标。特别强调的是一个改进的和可控的实验装置的发展，允许安全和快速制造所需的碳物体。
The fast and cheap synthesis of carbon nanotubes is addressed in a large number of recent publications. At the same time, microwave-assisted synthesis has also gained interest. Besides the fact that reaction kinetics can be positively influenced by the use of microwave irradiation and advanced reaction conditions can be applied, absorption of microwave radiation depends on the material properties, thus resulting in a selective heating mechanism. The selective heating process allows for locally created temperatures high enough to promote the growth of carbon nanofibers and nanotubes; on patterned iron catalyst layers. The resulting fibers are micrometers long, and can be synthesized in short time scales of a few minutes, yielding dense films of carbon fibers with uniform height. Here, the selective heating of surface bound iron nanoparticles is investigated in more detail, and experimental evidence for this effect is provided by utilizing a self- assembled monolayer of n-octadecyltrichlorosilane, which acts as a sensitive indicator for locally elevated temperatures. Special emphasis is placed on the development of an improved and controllable experimental setup that permits the safe and fast fabrication of the desired carbon objects.