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4시 20분부터 제1과학관 31214 e+강의실에서 다과를 준비하오니 많은 참석 부탁드립니다.

아 래

Title: Single-molecule chemistry and spectroscopy on ultrathin insulating films

Speaker: Dr. Yousoo Kim ( RIKEN, Japan )

Date & Time: Nov. 18 (Wed.) 2015, 4:30 PM

Place: Natural Science 1,  Room No. 31214

Abstract: Ultrathin insulating films grown on metal substrate has been a subject of great
interest for investigation of individual adsorbate atoms and molecules using a scanning
tunneling microscope (STM), because of electronic decoupling between the adsorbate
and supporting metal surface under an STM junction. Here, I will talk about two
representative works that we have done about energetics at the single-molecule
interfaces on the ultrathin insulating films.
The chemical reactivity of a water molecule on an
ultrathin MgO film supported by the Ag(100) substrate
depends greatly on film thickness and be enhanced
compared to that achieved with their bulk counterpart [1].
The change of chemical reactivity of ultrathin MgO film
depending on the film thickness can be explained by the
strengthening of the interaction between the oxide and
metal interface layers [2]. Our results clearly show that
such structural imperfections at the interface can improve
the chemical reactivity of the MgO film supported by an
Ag substrate [3].
Optical properties of a single metal-free phthalocyanine (H2Pc) molecule on the
2-ML thick NaCl film supported by Ag(111) have been also studied by scanning
tunneling luminescence spectroscopy. I will discuss about the single molecule reaction
of an H2Pc molecule with tunneling electrons and accompanied optical property
changes in a single-molecule luminescence spectra.
[1]. H.-J. Shin, J. Jung, K. Motobayashi, S. Yanagisawa, Y. Morikawa, Y. Kim, and M.
Kawai, Nat. Mater. 9, 442 (2010).
[2]. J. Jung, H.-J. Shin, Y. Kim, and M. Kawai, Phys. Rev. B 82, 085413 (2010);
[3]. J. Jung, H.-J. Shin, Y. Kim, and M. Kawai, J. Am. Chem. Soc. 133, 6142 (2011); J.
Am. Chem. Soc. 134, 10554 (2012)

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