| 학회 | 한국재료학회 |
| 학술대회 | 2010년 가을 (11/11 ~ 11/12, 무주리조트) |
| 권호 | 16권 2호 |
| 발표분야 | B. Nano materials and processing Technology(나노소재기술) |
| 제목 | Size controlled Growth of ZnO nanorods in low temperature hydrothermal growth |
| 초록 | Zinc oxide (ZnO) is a wide band gap semiconductor with a direct band gap of 3.37 eV at room temperature. ZnO nanostructures with various shapes especially one-dimensional (1D) ZnO nanostructure becomes the most valuable nanostrcutures for optical, electrical, environmental, and biological applications. In turn to utilize for the applications of nanostructure materials, it usually requires that the crystalline morphology, orientation and density of nanostructures had to be well controlled during the preparation processes. ZnO nanorods synthesis by different fabrication methods, such as vapor-phase transport, pulsed laser deposition, and chemical vapor deposition has been widely performed to prepare. However, these methods need complex processes, sophisticated equipments, high process temperatures, and high fabrication cost. Chemical solution method shows its great advantages due to much easier operation and very low temperature (95°C). In this study, we have synthesized vertical and narrow-diameter (up to diameter of 50nm) ZnO nanorods on SiO2/Si (100) substrates by solution process. Spin-coating technique was used to prepare ZnO seed layer on substrates. Zinc acetate anhydrate (CH3CO2)2Zn) was used to make a solution for spin coating. For the hydrothermal growth of ZnO nanorods, zinc nitrate hexahyderate (Zn (NO3)26H2O) and hexamethylenetetramine (C6H12N4) were used to make an aqueous precursor solution. The ZnO nanorods grown by this method showed a good reproducibility, and were easy to control size and orientation. To see the effect of spin coated ZnO seed layer on synthesis of ZnO nanorods, seed layers were prepared by changing a thickness of seed layer and a concentration of the solution. Very uniform and flat ZnO seed layers with rms roughness values of 1~2 nm were prepared by a simple spin coating process. To examine the concentration effect on the diameter of ZnO nanorods we carried out hydrothermal reactions with different concentrations of precursors. By simply changing the concentration, the ZnO nanorods with diameters from 175 ~ 45 nm have been synthesized. It was observed that ZnO seed layer and precursor concentration of hydrothermal growth can affect the diameter, density and orientation of the nanorods. The effects of nanorod sizes and the details of investigation will be discussed. |
| 저자 | Eadi sunil Babu, 한석규, 이효성, 홍순구 |
| 소속 | 충남대 |
| 키워드 | Zinc oxide; Nano structures |
