신소재공학과

Seminar

Date 20170824 

■ TitleAberration-corrected liquid electron microscopy of colloidal and energy materials    

            
■ Speaker: Prof. Jong Min Yuk (MSE KAIST)

 

■ Date and time: 29th of August (Tue) 16:00

 

■ Venue: KAIST Applied Engineering B/D(W1), Multimedia Lecture Hall (1st Floor)

  

 Abstract : Liquid phase transmission electron microscopy (TEM) has solved many questions in biochemistry, materials science, environmental science, and catalysis. Such observations could greatly benefit from high-resolution offered by aberration-corrected TEMs. However the relatively thick SiN windows necessary to encapsulate the liquid under vacuum and even the liquid trapped between the windows degrades the TEM resolution and signal-to-noise ratio.   Thus, most of critical events are still vague due to the lack of ability to study specimen in liquid with atomic resolution. Here, we introduce a new type of liquid cell using graphene sheets to encase colloidal growth solution for in-situ high-resolution TEM (HR-TEM) imaging. The flexibility, mechanical strength and impermeability of graphene allow for the solution to remain liquid within the TEM vacuum while Pt nanoparticles grow and combine under the influence of the electron beam. We demonstrate in-situ observations of the growth, dynamics, and three-dimensional structures of individual colloidal nanocrystals by using graphene liquid cell TEM. I further show in-situ HR-TEM of lithiation process for diverse anode materials, which are not achievable with any other current methods.

 

No. Subject Author Date Views
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226 9/12 (Tue) Prof. Pil Jin, Yoo (Sungkyunkwan Univ) ADMINI 2017.09.08 680
225 9/11 (Mon) Won Joon, Cho (Lawrence Berkeley National Lab, Berkeley) ADMINI 2017.09.06 761
224 9/13 (Wed) Dr. In Kyung Yoo (SAIT) ADMINI 2017.09.06 934
» 8/24 (Tue) Prof. Jong Min Yuk (MSE KAIST) ADMINI 2017.08.24 941
222 6/16 (Fri) Dr. Bok Yeop Ahn (Harvard University) ADMINI 2017.06.13 2423
221 6/12 (Mon) Prof. C. Suryanarayana (University of Central Florida) ADMINI 2017.06.05 1116
220 6/2 (fri) Robert M. Ulfig (CAMECA Instruments Inc) ADMINI 2017.06.01 1003
219 6/5 (Mon) Dr. Aron Varga/Dr. Andriy Lotnyk ADMINI 2017.05.30 1190
218 5/30 (Tue) Prof. Chang Hyeon Ko (Sookmyung Univ) ADMINI 2017.05.26 1234
217 5/23 (Tue) Prof. Don Hyeong Ha (Choongang university) ADMINI 2017.05.19 900
216 5/16 (Tue) Prof. Eun Sun Cho (KAIST CBE) ADMINI 2017.05.10 1096
215 5/2 (Tue) Prof. Seung Woo Lee (SKKU) ADMINI 2017.04.28 1174
214 4/25 (Tue) Prof. Hyeong Sup Choi (Seoul National University of Science and Technology) ADMINI 2017.04.20 1042
213 4/11 (Tue) Prof. Kyeong Sook Choi (Eulji National University, Medical school) ADMINI 2017.04.07 1100
212 4/4 (Tue) Mrs. Eun Joo Jang (Samsung) ADMINI 2017.03.31 1182
211 3/28 (Tue) Prof. Lim Won Bin (Jeonnam National University) ADMINI 2017.03.24 1019
210 3/21 (Tue) Prof. Park Sang Duk (Seoul National University) ADMINI 2017.03.20 950
209 3/14 (Tue) Dr. Hwa Nyun Kim (LG) ADMINI 2017.03.11 991
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