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Original Anisotropic Growth Mode of Copper Nanorods by Vapor Phase Deposition

机译:气相沉积法制备铜纳米棒的原始各向异性生长模式

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We report on a thermal evaporation method to synthesize copper nanorods, up to several microns long. The synthesis parameters that control the size and aspect ratio are studied to understand their influence on this anisotropic growth mode. We exploit the multifunctionalities of electron microscopy for studying the structural properties of these nanorods, in particular their growth morphology. By analyzing the face-centered cubic structure of the nanorods along several orientations, we demonstrate that their anisotropic axis is parallel to the [110] direction. The precise 3D shape of the nanorods is determined by using electron tomography, evidencing a morphology with a 2-fold symmetry and rectangular facets. This unusual faceting for metal nanorods is actually consistent with energetic considerations and arises from a growth mode that is different from the one of chemically prepared nanorods.
机译:我们报告了一种热蒸发方法,可合成长达数微米长的铜纳米棒。研究了控制尺寸和纵横比的合成参数,以了解它们对这种各向异性生长模式的影响。我们利用电子显微镜的多功能性来研究这些纳米棒的结构特性,特别是它们的生长形态。通过分析纳米棒沿几个方向的面心立方结构,我们证明了它们的各向异性轴平行于[110]方向。纳米棒的精确3D形状是通过电子断层扫描确定的,证明了具有2倍对称性和矩形小平面的形态。金属纳米棒的这种不同寻常的刻面实际上与能量方面的考虑相符,并且是由与化学制备的纳米棒不同的生长模式引起的。

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