Chae Hyun Uk, Rana Abu Ul Hassan Sarwar, Park Ye-Jin, Kim Hyun-Seok
Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul 04620, South Korea.
J Nanosci Nanotechnol. 2018 Mar 1;18(3):2041-2044. doi: 10.1166/jnn.2018.14971.
In this study, we present the microwave-assisted growth (MAG) of ZnO nanorods (ZNRs) using a preheating hydrothermal method under tailored preheating and postheating growth conditions. The perimeters such as solution concentration, preheating time, and postheating time, were changed to optimize ZNR growth and the growth was carried out in a domestic 850 watt microwave oven. Preheated solution was utilized as an accelerator to increase the aspect ratio of the ZNRs and reduce the fabrication time. Because of a long fabrication time and limited length in the conventional MAG method, preheating condition was used for efficient growth of nanorods through homogeneous nucleation in the solution and then heterogeneous nucleation of the formed ZNRs on seeded substrate during postheating process. The nanostructures were characterized with scanning electron microscopy to look at the morphology and dimensions. Dimensions of ZNRs kept on increasing as the molar concentration went higher. Preheating time highly affected the morphology, dimensions, and aspect ratio of ZNRs and postheating time not only ensured the stability of ZNRs with substrate due to heterogeneous nucleation process but also influenced the morphology of ZNRs.
在本研究中，我们展示了在定制的预热和后热生长条件下，采用预热水热法进行氧化锌纳米棒（ZNRs）的微波辅助生长（MAG）。改变诸如溶液浓度、预热时间和后热时间等参数，以优化ZNR的生长，且生长过程在一台家用850瓦微波炉中进行。预热溶液被用作促进剂，以增加ZNR的长径比并缩短制备时间。由于传统MAG方法制备时间长且长度有限，因此采用预热条件，通过溶液中的均匀成核实现纳米棒的高效生长，然后在后热过程中，在籽晶衬底上已形成的ZNRs进行异质成核。通过扫描电子显微镜对纳米结构进行表征，以观察其形态和尺寸。随着摩尔浓度的升高，ZNRs的尺寸持续增加。预热时间对ZNRs的形态、尺寸和长径比有很大影响，而后热时间不仅通过异质成核过程确保了ZNRs与衬底的稳定性，还影响了ZNRs的形态。
