Symmetric growth of carbon nanosheets on Cu nanowires by a surface diffusion mechanism
Symmetric growth of carbon nanosheets on Cu nanowires by a surface diffusion mechanism
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DOI：
10.1088/0957-4484/18/34/345607
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发表时间：
2007-07
期刊：
影响因子：
3.5
通讯作者：
Yong Qin;M. Eggers;T. Staedler;Xin Jiang
中科院分区：
文献类型：
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作者：
Yong Qin;M. Eggers;T. Staedler;Xin Jiang
以乙炔为源气体，以铜纳米线为催化剂，采用化学气相沉积的方法，在250°C的温度下制备了定向碳纳米片。每根铜纳米线总是在相反的方向上引发孪晶纳米片的对称生长。纳米片的长度为几个微米，与铜纳米线的长度相似。它们的厚度约为100 nm，并由铜纳米线的直径控制。它们的宽度取决于生长时间，20min的生长时间约为1.2微米。在二维生长过程中，铜纳米线保持其一维形状。纳米片的生长是通过生长物种在铜纳米线上的表面扩散而不是气-液-固机制来实现的。这种纳米线催化的化学气相沉积方法简单，可推广到其他二维纳米结构的制备。
Aligned carbon nanosheets were synthesized by chemical vapor deposition using acetylene as a source gas and Cu nanowires as catalysts at 250 °C. The nanosheets follow the alignment of the original Cu nanowire arrays. Each Cu nanowire always initiates the symmetric growth of twin nanosheets in opposite directions. The length of the nanosheets is several microns, similar to that of the Cu nanowires. Their thickness is about 100 nm and is controlled by the diameter of the Cu nanowires. Their width depends on growth time, which is about 1.2 µm for 20 min of growth. During the two-dimensional growth, the Cu nanowires maintain their one-dimensional shape. The nanosheets grow by surface diffusion of growth species on Cu nanowires, instead of a vapor–liquid–solid mechanism. This nanowire-catalyzed chemical vapor deposition method is simple and can be extended to the fabrication of other two-dimensional nanostructures.