콜타르피치를 이용한 Invar 합금 위 탄소나노튜브의 합성

초록

We report the growth of carbon nanotubes (CNT) on Invar-42 plates using coal tar pitch (CTP) by chemical vapor deposition (CVD) method. The solid phase CTP is used as an inexpensive carbon source since it produces a bunch of hydrocarbon gases such as CH4 and other CxHv by thermal decomposition over 450oC. The Invar- 42 is a representative Ni-based ferrous alloy and can be used repetitively as a substrate for CNT growth because Ni and Fe are used as very active catalytic elements. We changed mixing ratio of carrier gases, argon and hydrogen, and temperature of growth region. It was found that the optimum gas ratio and temperature for high quality CNT growth are Ar:H2 = 400:400 sccm and 1000oC, respectively. In addition, the carbon nanoball (CNB) was also obtained by just changing the mixing ratio to Ar:H2 = 100:600 sccm. Finally, CTP can be employed as a versatile carbon source to produce various carbon-based nanomaterials, such as CNT and CNB.

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