| 학회 |
한국화학공학회 |
| 학술대회 |
2006년 봄 (04/20 ~ 04/21, 대구 인터불고 호텔) |
| 권호 |
12권 1호, p.895 |
| 발표분야 |
재료 |
| 제목 |
Catalyst-free synthesis of coaxial-shaped hexagonal ZnO nanocolumns by thermal evaporation: Growth mechanism, Structural and Optical properties |
| 초록 |
Single crystalline with the perfect hexagonal-shaped ZnO nanocolumns have been synthesized in a large quantity, for the first time, on steel alloy substrate through the thermal evaporation of metallic zinc powder at low temperature of 490°C without the use of metal catalyst or additives. SEM and TEM observations clearly reveal that the grown products exhibiting an interesting morphology i.e. coaxial-shaped structure at their tips. A new layer-by-layer three-step growth mechanism was proposed for the formation of these hexagonal coaxial-shaped tips of the nanocolumns. Detailed structural analyses confirm that the formed nanocolumns are exhibiting a wurtzite hexagonal phase and preferentially oriented in the c-axis direction. Presence of a sharp, strong and dominated optical-phonon Raman-active E2 mode in the spectrum demonstrate that the grown products are good in crystal quality and proved a hexagonal crystal structure for the synthesized ZnO nanocolumns. Moreover, the optical properties of the deposited products were examined in detail by the temperature-dependant photoluminescence (PL) spectra. |
| 저자 |
Umar Ahmad, 한윤봉
|
| 소속 |
전북대 |
| 키워드 |
Catalyst-free; ZnO nanocolumns
|
| E-Mail |
|
| VOD |
VOD 보기 |
| 원문파일 |
초록 보기 |
