Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore.
Nanotechnology. 2010 Jun 25;21(25):255701. doi: 10.1088/0957-4484/21/25/255701. Epub 2010 May 28.
We report the growth of ultrathin single-crystal ZnO nanobelts by using a Ag-catalyzed vapor transport method. Extensive transmission electron microscopy and atomic force microscopy measurements reveal that the thickness of the ultrathin ZnO nanobelts is approximately 2 nm. Scanning electron microscopy and post-growth annealing studies suggest a '1D branching and 2D filling' growth process. Our results demonstrate the critical role of catalyst in the deterministic synthesis of nanomaterials with the desired morphology. In addition, these ultrafine nanobelts exhibit stable field emission with unprecedented high emission current density of 40.17 mA cm(-2). These bottom-up building blocks of ultrathin ZnO nanobelts may facilitate the construction of advanced electronic and photonic nanodevices.
我们使用 Ag 催化的气相输运法生长出了超薄的单晶 ZnO 纳米带。大量的透射电子显微镜和原子力显微镜测量表明，这些超薄 ZnO 纳米带的厚度约为 2nm。扫描电子显微镜和生长后的退火研究表明了一种“1D 分支和 2D 填充”的生长过程。我们的结果证明了催化剂在具有所需形态的纳米材料的确定性合成中起着关键作用。此外，这些超细纳米带具有稳定的场发射性能，其发射电流密度高达前所未有的 40.17mA/cm2。这些超薄 ZnO 纳米带的自下而上的构筑块可能会促进先进的电子和光子纳米器件的构建。
