Next-generation detection system Smart Lab

Associate Professor YAMAMOTO Susumu
  • Development of novel X-ray operando measurement methods and their application to surface and interface processes
  • Dynamics of molecules and carriers at surfaces studied by advanced X-ray photoelectron spectroscopies
Operando measurements, X-ray spectroscopy, Ultrafast spectroscopy, Catalyst, Surface chemistry
Research Activities

Catalytic surface science opened by synchrotron radiation X-ray operando measurements

Surfaces and interfaces of materials play important roles as reaction fields in the material and energy conversion processes such as catalysts/photocatalysts, fuel cells, lithium ion batteries. These reaction fields are usually in contact with gas atmospheres and liquids, and it has been difficult to directly observe them using conventional surface science techniques in ultrahigh vacuum. Recently, “operando” measurements, which can directly study the reaction field under the reaction, are developing rapidly.
My research theme is "operando observation of molecules and photo-excited carriers on catalyst surfaces/interfaces" using various light sources such as synchrotron radiation X-rays, infrared light, and ultrashort pulse lasers. In recent years, I developed two operando X-ray photoelectron spectroscopy (XPS) systems (picosecond time-resolved XPS and ambient pressure XPS), and succeeded in studying dynamics of molecules and photo-excited carriers at catalyst surfaces/interfaces. I aim to develop a novel operando measurement method that utilizes soft X-rays as well as Tender/Hard X-rays at the "next-generation synchrotron radiation facility", and to elucidate the mechanism of function expression not only in model systems but also in real materials.

Ambient pressure X-ray photoelectron spectroscopy (AP-XPS) system developed at SPring-8 BL07LSU.

Different wetting behavior of water on two Cu surfaces revealed by O 1s AP-XPS spectra. (p(H2O)= 1 Torr, T= 295 K)

I challenge to develop X-ray operando measurement technologies that can compete with the world at the next generation synchrotron radiation facility.