In situ studies of growth of carbon nanotubes on a local metal microheater.
In situ studies of growth of carbon nanotubes on a local metal microheater.
复制标题
碳纳米管在局部金属微加热器上生长的原位研究。
DOI：
10.1088/0957-4484/26/50/505601
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发表时间：
2015
期刊：
影响因子：
3.5
通讯作者：
Nerushev OA
中科院分区：
文献类型：
--
作者：
Nerushev OA
使用电子显微镜和原位拉曼光谱，我们研究了碳纳米管的生长从乙烯上的铁催化剂岛图案上的钼电极，使用高度本地化的电阻片上加热技术。随着加热器局部温度的升高，观察到多壁和单壁纳米管生长之间的明显转变。这可以根据进入的碳通量和通过催化剂颗粒的扩散之间的平衡来合理化。探索了暴露于烃类气体时加热器性能的观察到的变化，并将其与碳化钼的形成相关，导致电阻率和加热功率的快速变化，使加热器的局部温度增加高达100 ℃。这为在取决于碳通量的孵育时间之后的纳米管生长提供了最佳条件。
Using electron microscopy and in situ Raman spectroscopy we investigate carbon nanotube growth from ethylene on iron catalyst islands patterned on top of Mo electrodes, using a highly localized resistive on-chip-heating technique. A clear transition is observed between multi-walled and single-walled nanotube growth as the local temperature of the heater is increased. This can be rationalized in terms of the balance between incoming carbon flux and diffusion through the catalyst particle. The observed changes in heater performance on exposure to the hydrocarbon gas are explored and related to the formation of molybdenum carbide, leading to a rapid change in resistivity and heating power that increases the local temperature of the heater by up to 100 C. This provides optimum conditions for nanotube growth after an incubation time that depends on the carbon flux.