원통형 압전 진동자를 이용한 ZnO 나노구조물의 성장에 관한 연구

Abstract

Recently, synthesis methods of new nanostuctured materials such as hydrothermal method, vapor-liquid-solid method, chemical vapor deposition and thermal evaporation have attracted a lot of researches. The ZnO nanostuctured materials is especially interested due to their unique structure and size-dependent electrical, optical and mechanical properties. However, the conventional methods have a various problem such as low crystallinity, long reaction time and limitation of substrate. In order to solve these problems, in this paper, we designed the ZnO growth device using a cylindrical piezoelectric PZT vibrator. This growth device is suggested for more simple and efficient synthesis method by using focused ultrasound. To confirm the effectiveness of the device, the results obtained by the cylindrically focused ultrasound were discussed with the non-focused and the hydrothermal systhesis method in different conditions. As the results, it is shown that the ZnO nanostructured materials grew up well with focused ultrasound comparing with the results without the focusing. From the results, the validity of the suggested growth method using cylindrically focused ultrasound could be confirmed.