Graphitization of Gallium‐Incorporated Carbon Nanofibers and Cones: In Situ and Ex Situ Transmission Electron Microscopy Studies
Graphitization of Gallium‐Incorporated Carbon Nanofibers and Cones: In Situ and Ex Situ Transmission Electron Microscopy Studies
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掺镓碳纳米纤维和锥体的石墨化：原位和异位透射电子显微镜研究
DOI：
10.1002/pssb.202000309
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
M. Tanemura
中科院分区：
文献类型：
--
作者：
Balaram Paudel Jaisi;Subash Sharma;S. Elnobi;A. Abuelwafa;Y. Yaakob;G. Kalita;M. Tanemura
该研究证明了在低熔点金属镓（Ga）的催化下，通过在真空加热器中加热以及在原位透射电子显微镜（TEM）操作期间通过焦耳加热直接通过无定形碳的石墨化。对于Ga纳米颗粒（NPs）和无定形碳基体的混合物的材料系统，首次确定石墨化温度为约600 °C。随着温度的升高，小的Ga纳米颗粒的蒸发和团聚开始与石墨化一起发生在Ga纳米颗粒将位于表面区域的地方周围。原位TEM实验揭示了导电性的加速增加与结构的变化，从非晶到石墨化。因此，结合原位和非原位TEM观察被认为是一个领先的步骤，以了解更深的石墨化过程，并提供纳米级的信息。
This study demonstrates graphitization directly through the amorphous carbon under the catalysis of a low‐melting‐point metal, gallium (Ga), by heating in a vacuum heater as well as by Joule heating during in situ transmission electron microscopy (TEM) operation. For the material system of the mixture of Ga nanoparticles (NPs) and amorphous carbon matrix, the graphitization temperature is determined to be about 600 °C for the first time. With increasing the temperature, evaporation and agglomeration of small Ga NPs start to occur together with the graphitization at around the places where Ga NPs would have been located at the surface region. In situ TEM experiment reveals the accelerated increase in electrical conductivity with structural change from amorphous to graphitization. Thus, the combination of the in situ and ex situ TEM observations is believed to be a lead step to understand deeper the graphitization process and provide information in nanoscale.
DOI：
--
发表时间：
2006
期刊：
Appl. Phys. Lett 88
影响因子：
--
作者：
J. Fujita;T. Ichuhashi;S. Nakazawa;S. Okada;M. Ishida;Y. Ochiaic;T. Kaito;and S. Matsui
通讯作者：
and S. Matsui
离子辐照诱导单根碳纳米纤维直接生长到扫描探针显微镜尖端
DOI：
--
发表时间：
2006
期刊：
Jpn. J. Appl. Phys. 45
影响因子：
--
作者：
T.T.Tan;H.S.Sim;S.P.Lau;H.Y.Yang;M.Tanemura他;M.Tanemura 他;M.Tanemura 他
通讯作者：
M.Tanemura 他
影响因子：
2.8
作者：
Somani, Prakash R.;Somani, Savita P.;Umeno, Masayoshi
通讯作者：
Umeno, Masayoshi