Dr. Hisato Yasumatsu, Toyota Technological Institute

Nano-Space Two-Dimensional Charge Polarization Induced at Interface between Monatomic-Layered Cluster Disk and Solid Surface

Physical Chemistry Seminar Series

Aiming to educe novel functions from clusters on the basis of their fundamental properties such as electron confinement, variety of atomic arrangements, etc., one can enhance these specific properties by interactions with a solid surface. We have discovered in our STM measurements [1-4] that a negative electric charge are accumulated at the interface between a monatomic-layered close-packed platinum cluster disk and a silicon surface, while a positive one is confined but delocalized in the cluster disk [3]; the cluster impact [5] was employed for the preparation of the samples having uni-size clusters [1]. This two-dimensional charge polarization in a nano-space induces a strong electric field in a molecular size, leading to cluster-specific catalytic and photoelectric activities. This cluster-surface system reveals low-temperature activation of O2

[1] H. Yasumatsu, T. Hayakawa, S. Koizumi and T. Kondow, J. Chem. Phys. 123, 124709 (2005). Virtual J. Nanoscale Sci. Technol. 12 (2005).
[2] H. Yasumatsu, T. Hayakawa and T. Kondow, J. Chem. Phys. 124, 014701 (2006).
[3] H. Yasumatsu, T. Hayakawa and T. Kondow, Chem. Phys. Lett. 487, 279 (2010).
[4] H. Yasumatsu, P. Murugan and Y. Kawazoe, submitted to Phys. Stat. Solidi (2011).
[5] H. Yasumatsu and T. Kondow, Rep. Prog. Phys. 66, 1783-1832 (2003).
[6] H. Yasumatsu, M. Fuyuki, T. Hayakawa and T. Kondow, J. Phys. Conf. Ser. 185, 012057 (2009).
[7] H. Yasumatsu, Euro. Phys. J. D, 63, 195-200 (2011).
[8] T. Hayakawa, H. Yasumatsu and T. Kondow, Euro. Phys. J. D 52, 95-98 (2009).
[9] T. Hayakawa and H. Yasumatsu, submitted to Phys. Chem. Chem. Phys. (2011).
[10] S. K. Pregler, T. Hayakawa, H. Yasumatsu, T. Kondow and S. B. Sinnott, Nuc. Instrum. Methods Phys. Res. B 262, 240 (2007).

For more information contact Prof. Mostafa El-Sayed (404-894-0292).