Majima Lab
Laboratory for Materials and Structures
Dept. of Materials Science and Engineering
Tokyo Institute of Technology
4259 R3-5 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan.

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Research Highlight


Chemically assembled single-electron transistors

 We have fabricated a chemically assembled SET consisting of electroless-gold plated nanogap electrodes and synthesized Au nanoparticles chemically anchoring on both side of the nanogap electrodes. Rhombic shape Coulomb diamonds result from chemically anchoring of the core of the Au nanoparticle at both ends between the electroless-Au-plated nanogap electrodes. (Nanoscale., 8, 4720, 2016).

Electroless Gold Plating

Nanogap electrodes fabrication by using electroless gold plating

 We have established the simultaneous fabrication process of less than 5 nm nanogap electrodes by using electroless gold plating method with iodine tincture and ascorbic acid (known as vitamin C). These nanogap electrodes allows us to establish molecular devices and single electron devices, which work at room temperature with high yield. (Appl. Phys. Lett., 91,203107, 2007).

Coulomb Blockade Electron Shuttle

Coulomb blockade electron shuttle devices as current standard device

 We have demonstrated one by one electron and hole transportation by nanomechanical resonance and electron tunneling using Coulomb blockade phenomena. (Appl. Phys. Lett., 91, 053120, 2007)

Single molecular orientation switching of an endohedral metallofullerene

We have demonstrated an Endohedral Metallofullerene shows switching behavior for the first time.
Since endohedral metallofullerene has dipole moment, we have measured negative difference conductance due to the dipole change in scanning tunneling spectroscopy.
The paper published in Nano Letters (Nano Lett., 5, 1057, 2005) has been cited as an example of molecular devices in International Technology Roadmap for Semiconductors (ITRS) 2005.

STM tip / vacuum / Tb@C82 / SAM / Au(111) Tb@C82 Molecular Switch

Scanning Lorentz force microscopy

Scanning Lorentz Force Microscopy

We have proposed and developed a novel magnetic imaging technique using scanning probe microscopy by detecting Lorentz force acting on a conductive tip, called scanning Lorentz force microscopy (SLFM).

Single electron on a gold nanodot observed by noncontact atomic-force spectroscopy

Toward Coulomb blockade single electron shuttle device, single electron on a gold nanodot in a double-barrier tunneling structure has been observed by noncontact atomic-force spectroscopy.

non-contact atomic force microscopy nc-AFS

Simultaneous measurement method for charge injection and carrier transport properties in organic thin-film transistors (OTFTs)

In order to understand charge injection and carrier transport properties in organic thin-film transistors (OTFTs), we have proposed and developed a simultaneous measurement method for displacement current and transfer curves in both top-contact and bottom-contact OTFTs under device operation.

 pentacene bottom contact thin-film transistor Model Analysisoutput characteristics