The 300th MANA & the 130th ICYS Joint Seminar
Dr. Jianhua Gao & Dr. Ken Watanabe
| Date | December 7, Friday |
| Time | 15:30-16:30 |
| Place | Seminar room #811, 8F, Central Bldg., Sengen Site, NIMS |
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15:30-16:00
Growth of Single-layer Graphene on Single Crystal Pt(111) Substrates
The typical sp2–bonded graphene layer with honeycomb crystal structure, have attracted special interests in both fundamental research and potential applications because of its remarkable properties and chemical stability. Especially graphene grown on metal substrate such as Pt(111) substrate are much interesting because of its weak interaction between graphene and substrate. Here we report the fabrication of single-layer graphene on carbon-doped single-crystal Pt(111) (0.05 %) substrate by surface segregation and on Pt(111) substrate by chemical vapor deposition, respectively. It is found that single-layer graphene islands can form on Pt(111) surfaces, the size can be up to about 50µm. The atomic structure of graphene islands has been investigated by scanning tunneling microscopy (STM), which exhibit hexagonal atomic lattice, indicating the weak interaction between graphene and the Pt(111) substrate. By chemical vapor deposition, the wafer-scale single-layer graphene can be achieved.
Speaker
Dr. Jianhua Gao, ICYS-Sengen Researcher, NIMS
Chair
Dr. Kenjiro Miyano, Managing Director, ICYS, NIMS
16:00-16:30
Oxygen diffusion study on mixed ionic-electronic conductive oxides
Mixed ionic-electronic conductors are materials which exhibit both oxide ionic and electronic (electron and/or hole) conductivity. Therefore, those materials have been paid much attention as electrochemical devices for energy and environmental fields such as an electrode of SOFC, a gas sensor, an oxygen permeable membrane, membrane reactors for synthesis gases and so on. It is well known that the oxygen diffusivity acts as the important role, in order to control the performance of mixed conductors. Here, in this talk, I will talk about evaluation of the oxygen diffusivity and oxygen non-stoichiometry in mixed conductors, using the oxygen tracer diffusion and the secondary ion mass spectrometry (SIMS).
Speaker
Dr. Ken Watanabe, ICYS-MANA Researcher, MANA, NIMS
Chair
Dr. Kazunori Takada, MANA PI, MANA, NIMS