Journal
MICROSCOPY AND MICROANALYSIS
Volume 28, Issue 1, Pages 53-60Publisher
OXFORD UNIV PRESS
DOI: 10.1017/S1431927621013647
Keywords
early stage of reaction; graphene encapsulation; in situ transmission electron microscopy (TEM); nanoparticle
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Funding
- NRF - Korean government (MSIP) [NRF-2018R1A5A6075959, NRF-2019R1A2C1006730]
- Korea Basic Science Institute (KBSI)
- National Research Facilities & Equipment Center (NFEC) grant - Korean government (MOE) [2019R1A6C1010031]
- Cooperative Center for Research Facilities (CCRF) at Sungkyunkwan University
- National Research Foundation of Korea [2019R1A6C1010031] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Researchers have proposed a methodology utilizing graphene encapsulation to overcome the challenges in observing early stages of spontaneous solid-liquid reactions using a closed-type liquid cell TEM system. By suspending the reaction until the graphene layer is destroyed, solid and liquid are separated, allowing the reaction to proceed.
In situ liquid cell transmission electron microscopy (TEM) is a very useful tool for investigating dynamic solid-liquid reactions. However, there are challenges to observe the early stages of spontaneous solid-liquid reactions using a closed-type liquid cell system, the most popular and simple liquid cell system. We propose a graphene encapsulation method to overcome this limitation of closed-type liquid cell TEM. The solid and liquid are separated using graphene to suspend the reaction until the graphene layer is destroyed. Graphene can be decomposed by the high-energy electron beam used in TEM, allowing the reaction to proceed. Fast dissolution of graphene-capped copper nanoparticles in an FeCl3 solution was demonstrated via in situ liquid cell TEM at 300 kV using a cell with closed-type SiNx windows.
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