| 학회 | 한국재료학회 |
| 학술대회 | 2017년 가을 (11/15 ~ 11/17, 경주 현대호텔) |
| 권호 | 23권 2호 |
| 발표분야 | B. 나노화학/바이오 분과 |
| 제목 | The snythesis method and gas sensing properties of tin dioxide nanoparticle by plasma electrolytic oxidation process |
| 초록 | Tin dioxide nanoparticle is an n-type semiconductor with a high transparency in the visible light and electrical conductivity. It can be used as a transparent conducting oxides (TCOs), optical electronic devise and gas sensors. Tin dioxide is usually synthesized by precipitation, sol-gel method. However, it is difficult to control the size distribution, uses large amount of acid and base and spends much time while stirring. To overcome these disadvantages, the plasma electrolytic oxidation (PEO) process is applied. PEO process is an advanced technique of anodizing method which has been used to synthesize thick and durable oxide layer on the metal surface that can be easily corroded. By controlling the condition of the reaction, the oxidized metal can be detached from the metal surface. If the voltage increases above the breakdown voltage (400~600 V), the metal initiates to be melt down by metal ions. Oxygen ions from the hydrolysis of solution interpenetrate into the metal while producing sparks. As a result, the metal oxide can be produced. PEO process uses small amount of electrolyte, can be reacted with same solution and has short reaction time. Thus, it can make the process more easily, reduce the environmental pollution and producing cost. After the reaction, the synthesized powder showed amorphous state due to the physically adsorbed water molecule. Therefore, the powder was calcined at 600oC for 2 hours. The calcined powder showed increased crystallinity on tin dioxide. The particles were uniformly nano-sized spherical shape. The particle size could be controlled with 40.58 nm to 100.38 nm by changing condition of reaction such as concentration of electrolyte and frequency of the voltage. |
| 저자 | 김태형, 박경수, 이찬기 |
| 소속 | 고등기술(연) |
| 키워드 | <P>plasma electrolytic oxidation; tin dioxide nanoparticle</P> |
