Research

　Single electron transistors (SET) were fabricated using ultra-thin gold nanowires (AuNWs), which are synthesized via a chemical reduction process. By using these AuNWs as Coulomb islands, achieving high charging energy, easy connection with electrodes and effective gating are expected. We demonstrated a AuNW-based SET exhibiting transport properties based on a single-Coulomb island, where the periodical Coulomb oscillations and diamonds can be clearly observed.

Publications
- “Single electron transistors with ultra-thin Au nanowires as a single Coulomb island”
M. Yoshihira, S. Moriyama, H. Guerin, Y. Ochi, H. Kura, T. Ogawa, T. Sato, and H. Maki, Appl. Phys. Lett., 102 (2013) 203117.

- “Coulomb blockade phenomenon in ultra-thin gold nanowires”
H. Guerin, M. Yoshihira, H. Kura, T. Ogawa, T. Sato, H. Maki, Journal of Applied Physics, 111, 054304 (2012).

　Electrochemical ON/OFF-switching of absorption (electrochromism) has received attention for applications in displays. We demonstrate the display devices by using electrochromic materials based on metallosupramolecular polymers, which are prepared by complexation of metal ions and bis-terpyridine ligands. These are interesting materials due to their electrochromic properties based on the appearance/disappearance of metal-to-ligand charge transfer (MLCT) absorptions, which are triggered by electrochemical redox of the metal ions.

Publications
- “Electrochemical Switching of Luminescence in a Ru(II)-Based Metallo-Supramolecular Polymer Device”
Y. Muronoi, J. Zhang, M. Higuchi, H. Maki, Chem. Lett., 42 (2013) 761–763.

- “Electrochemically switchable photoluminescence of an anionic dye in a cationic metallo-supramolecular polymer”
Takahiro Suzuki, Takashi Sato, Jian Zhang, Miki Kanao, Masayoshi Higuchi, and Hideyuki Maki, J. Mater. Chem C, 2016, 4, 1594-1598(2016).