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Thermal CVD synthesis of carbon nanotubes filled with single-crystalline Cu nanoneedles at tips

2005; Elsevier BV; Volume: 15; Issue: 9 Linguagem: Inglês

10.1016/j.diamond.2005.09.043

1879-0062

Xinyong Tao, X.B. Zhang, J.P. Cheng, Zhiqiang Luo, Si-Ming Zhou, Fei Liu,

Graphene research and applications

Carbon nanotubes (CNTs) filled with Cu nanoneedles at tips have been synthesized using alkali-element doped Cu catalyst by a simple thermal chemical vapor deposition method. X-ray diffraction analysis reveals that Cu nanoneedles have perfect face-centered cubic structure. The carbon shells provide an effective barrier against oxidation and consequently ensure a long-term stability of the Cu core. Selected area electron diffraction indicates that these Cu nanoneedles are single crystalline with fine quality. Transmission electron microscopy and high-resolution transmission electron microscopy were employed to analyze the microstructure of Cu filled CNTs. On the basis of experimental results, a simple growth model is proposed in this paper.