| 학회 |
한국재료학회 |
| 학술대회 |
2018년 가을 (11/07 ~ 11/09, 여수 디오션리조트) |
| 권호 |
24권 2호 |
| 발표분야 |
3. 에너지 저장재료 실시간 분석 심포지엄(In Situ/Operando Analysis of Energy Storage)-오거나이저: 이현욱 교수(UNIST) |
| 제목 |
Nanomaterials Directly Observed by Multi-Dimensional Liquid Phase TEM |
| 초록 |
Liquid cell TEM (LTEM) has been introduced recently for in-situ study of chemical reactions occurring in liquid. Liquid cells allow an opportunity to utilize high spatial and temporal resolution of TEM in studying reactions of colloidal nanoparticles. Achieving sub-nm spatial resolution by adjusting the thicknesses of window materials and the encapsulated liquid, important steps in growth trajectories of different types of nanoparticles have been directly observed at high-resolution of TEM. Along with computational analysis, we also study growth trajectories of ensemble number of nanoparticles. We also observe the diffraction patterns from individual nanoparticles as they rotate in the liquid cell, and ultimately, we are able to align and invert those images to obtain the 3D atomic structure of individual particles freely moving in liquid. Obtained 3D density maps unveil structural features of nanoparticles that have been either underestimated or unattainable in conventional analysis. In addition, we advance LTEM to be applicable in studying electrochemical reactions of solid materials. As a representative example, in order to understand mechanistic pathways of charging and discharging on electrode reactions of Li-oxygen battery, we utilize liquid phase biasing TEM for the real-time observation of lithium-oxygen battery system. We also elucidate the roles of the discharge redox mediator. We present our efforts to augment a combination of above-mentioned analytical tools in directly observing chemical reactions of nanoparticles in reactive environments. |
| 저자 |
박정원1, 김병효2, 허준영1, 김성인1, 김주덕1, 이동훈1
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| 소속 |
1서울대, 2Center for Nanoparticle Research (IBS) |
| 키워드 |
<P>Liquid phase TEM; nanoparticles; in situ</P>
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| E-Mail |
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