Zhang Dong-Feng, Sun Ling-Dong, Yin Jia-Lu, Yan Chun-Hua, Wang Rong-Ming
State Key Lab of Rare Earth Materials Chemistry and Applications & PKU-HKU Joint Lab in Rare Earth Materials and Bioinorganic Chemistry, and Electron Microscopy Laboratory, Peking University, Beijing, 100871, China.
J Phys Chem B. 2005 May 12;109(18):8786-90. doi: 10.1021/jp050631l.
The rectangular cross-sectional ZnO nanowires were synthesized in a solution method. An attachment-driven growth mechanism was proposed for the morphology evolvement of ZnO nanocrystals from nanoparticles to nanoplates and eventually to nanowires. Due to the pileup attachment of the nanoplates to recrystallize into nanowires, unique one-dimensional (1D) ZnO nanowires with the rectangular cross section were obtained, which is different from those nanowires in the previous reports. It is the first time the evidence that "oriented attachment" can occur not only for nanoparticles but also for nanoplates was obtained, suggesting that "oriented attachment" is an intrinsic behavior for nanosized materials. According to the growth model proposed based on the direct TEM observations, ZnO nanocrystals can be easily controlled as nanoparticles, nanoplates, or nanowires by tuning the synthetic parameters.
采用溶液法合成了矩形横截面的ZnO纳米线。针对ZnO纳米晶体从纳米颗粒到纳米片并最终到纳米线的形貌演变，提出了一种附着驱动生长机制。由于纳米片的堆积附着再结晶形成纳米线，获得了具有矩形横截面的独特一维（1D）ZnO纳米线，这与先前报道中的纳米线不同。首次获得了“定向附着”不仅可以发生在纳米颗粒上，也可以发生在纳米片上的证据，表明“定向附着”是纳米材料的一种固有行为。根据基于直接透射电镜观察提出的生长模型，通过调整合成参数，可以轻松地将ZnO纳米晶体控制为纳米颗粒、纳米片或纳米线。
