Kast Michael, Schroeder Philipp, Hyun Youn J, Pongratz Peter, Bruückl Hubert
Austrian Research Centers GmbH - ARC, Tech Gate Vienna, Donau-City-Strasse 1, A-1220 Vienna, Austria. michael.kast@ arcs.ac.at
Nano Lett. 2007 Aug;7(8):2540-4. doi: 10.1021/nl070934m. Epub 2007 Jul 11.
Zinc metal nanowires (NWs) of two different morphologies have been synthesized in a cold-wall physical vapor deposition (CWPVD) chamber at high vacuum conditions and growth temperatures of 150 degrees C. Substrates initially seeded by gold or platinum crystals show NWs of wool-like and/or unidirectional morphologies. Transmission electron microscopy (TEM) studies revealed that the rodlike NWs consist of single-crystalline Zn covered with a thin native oxide. NWs of wool-like morphology are suppressed using platinum as the seed metal. NW growth proceeds via vapor-solid (VS) kinetics without any catalyst particles on the wire tips. The highest observed growth rates exceed the Zn deposition rate by factors up to 860, indicating the dominant role of surface diffusion of Zn adatoms, also along the NWs. The surface diffusion length of Zn adatoms on the NW side facet is determined to be 39 mum. Direct impingement of precursor atoms on the NW tip is not significant for the growth process.
在高真空条件和150摄氏度的生长温度下，于冷壁物理气相沉积（CWPVD）腔室中合成了两种不同形态的锌金属纳米线（NWs）。最初由金或铂晶体晶种的基底呈现出羊毛状和/或单向形态的纳米线。透射电子显微镜（TEM）研究表明，棒状纳米线由覆盖着一层薄天然氧化物的单晶锌组成。使用铂作为籽晶金属时，羊毛状形态的纳米线受到抑制。纳米线的生长通过气-固（VS）动力学进行，在线尖端没有任何催化剂颗粒。观察到的最高生长速率比锌沉积速率高出860倍，这表明锌吸附原子的表面扩散起主导作用，同样沿着纳米线。确定锌吸附原子在纳米线侧面的表面扩散长度为39微米。前驱体原子对纳米线尖端的直接撞击对生长过程并不重要。
