| 학회 | 한국재료학회 |
| 학술대회 | 2016년 봄 (05/18 ~ 05/20, 여수 디오션리조트 ) |
| 권호 | 22권 1호 |
| 발표분야 | G. 나노/박막 재료 분과 |
| 제목 | Real-time Observation of Electron Beam induced Au Particle Growth in a Liquid Phase |
| 초록 | Metal particle research has attracted considerable interests due to many innovative applications such as catalysis, fuel cell, encryption strategies, and biomedicine. These metal particles have various optical, electronical, and catalytic properties related to size and shape of particles unlike bulk materials. For many years, many efforts have been devoted to understand the nucleation and growth mechanism, and control the size and shape of metal particles. Liquid cell transmission electron microscopy has emerged as a wonderful technique for direct observation of particle growth in liquid phase. Especially, it allows us to observe structural changes and chemical processes in liquid phase, providing a combination of temporal and spatial resolution that is not achievable with other characterization techniques. Using in situ liquid cell transmission electron microscopy, we observe the formation of multiple Au particles during electron beam irradiation of gold chloride (HAuCl4) solution. The electron beam is used to precipitate Au particles from a solution of the Au ion via radiolysis, in which the electron beam forms, among other species, the hydrated electron (eh). The hydrated electron reduces the Au ions and allows Au particles to grow in HAuCl4 solution. Direct visualization of Au particles growth is demonstrated by observation of the series of Au particles formation process. It reveals growth kinetics, shape control mechanisms, and aggregation among Au particles. Here, we correctly analyze the growth kinetics and shape change about various conditions such as the molar concentration of HAuCl4 solution and dose rate of electron beam. At the end, accurate understanding of these phenomena is expected to provide a new insight understanding nucleation and growth kinetics in liquid reactive environments. |
| 저자 | 정완길, 김봉중 |
| 소속 | 광주과학기술원 신소재공학부 |
| 키워드 | metal particle; nucleation; growth; radiation; liquid cell transmission electron microscopy |
