| 학회 | 한국재료학회 |
| 학술대회 | 2007년 봄 (05/10 ~ 05/11, 무주리조트) |
| 권호 | 13권 1호 |
| 발표분야 | 나노 및 생체 재료 |
| 제목 | Growth Behavior of ZnO nanowires on Off-cut (100)Si Substrate |
| 초록 | Surface morphology of an anisotropic crystalline substrate plays a major role in controlling the growth of low-dimensional structures. In general, the anisotropy of the surface can influence the growth via at least two major mechanisms: firstly, it can induce an anisotropic strain, and secondly, it can confine the adatom diffusion to one dimension. Thus, it is expected that the surface feature of an anisotropic crystalline substrate, which consists of terraces separated by steps, can control the growth behavior of low-dimensional oxide nanowires without the presence of catalyst by a simple thermal evaporation. In order to investigate the initial growth behavior of ZnO nanowires on an anisotropic crystalline substrate, two different types of substrates were used: vicinal (100)Si with a 6° off-cut angle in the [011]Si direction and on-axis (100)Si. The present study gives a report for ZnO nanowires grown by a simple thermal evaporation of the ball-milled ZnO powders under controlled conditions without the presence of catalyst. In this study, it was found that the surface morphology of an anisotropic crystalline substrate plays a critical role for the nucleation of ZnO nanowires. For the vicinal substrate that consists of terraces separated by steps, ZnO nanowires nucleate preferentially near step-edge lines aligned along the [011]Si azimuth and then grow mainly along the direction perpendicular to the substrate. For the on-axis substrate, on the other hand, ZnO nanowires are randomlygrown over a large area of substrate. ZnO nanowires grown on two different types of substrates exhibit the similar photoluminescent properties. |
| 저자 | 이유기, 이영기 |
| 소속 | 위덕대 |
| 키워드 | ZnO nanowires; growth behavior; anisotropic crystalline substrate; off-cut (100)Si |
