Abstracts Book - IMRC 2018

• SD5-O011
INVESTIGATION OF LIQUID AND GAS USING ATOMIC RESOLUTION
STEM-EELS
Teruyasu Mizoguchi 1 , Tomohiro Miyata 1 , Yuki Sugimori 1
1 The University of Tokyo, Institute of Industrial Science, Japan.
Atomic resolution analysis using aberration-corrected STEM-EELS has been
mainly applied to crystalline materials. On the other hand, its applications to
liquid and gas have been limited. In this presentation, we are going to present
the atomic resolution analysis of ionic liquid and investigation of the dynamic
behavior of the gaseous molecule.
Ionic Liquids have characteristic properties, such as non-volatility, high ionic
density, and hydrophilicity. Owing to such properties, ionic liquids have been
studied for the wide range of applications. Atomic resolution observation of a
gold doped ionic liquid was conducted by STEM-EELS. TEM specimen for the
ionic liquid was fabricated using the simple method [1], and gold atoms were
clearly observed as bright spots. originating We also observed the dynamics of
monatomic ions in ionic liquids [2].
STEM-EELS method was also applied to investigate gaseous molecules. EELS of
gases were measured at 300 K and 1,300 K using environmental TEM, and the
spectral features were investigated using theoretical calculations. We found that
our method can successfully identify the dynamic behavior of some gaseous
molecules, and the sensitivity of the method is affected by the rigidity of the
molecule. The method has potential to measure the local temperature of
gaseous molecules as well.
[1] T. Miyata and T. Mizoguchi, Ultramicroscopy 178 (2017) 81-87.
[2] T. Miyata, F. Uesugi, and T. Mizoguchi, Science Advances, 3 (2017)
e1701546-1-5.
[3] H. Katsukura, T. Miyata, M.Shirai, H. Matsumoto, and T. Mizoguchi, Scientific
Reports, 7 (2017), 16434-1-9.
Acknowledgment: