Satoshi Kaneko

Adsorption sites of molecules critically determine the electric/photonic properties and the stability of heterogeneous molecule-metal interfaces. Then, selectivity of adsorption site is essential for development of the fields including organic electronics, catalysis, and biology. However, due to current technical limitations, site-selectivity, i.e., precise determination of the molecular adsorption site, remains a major challenge because of difficulty in precise selection of meaningful one among

The formation of the single benzene molecule junction was investigated for Au and Ag electrodes by conductance measurements and inelastic tunneling electron spectroscopy at 10 K. While a single benzene molecule junction was hardly formed for the Au electrodes, a single benzene molecule junction was formed for the Ag electrodes. The single Ag/benzene/Ag junction showed a fixed conductance value of 0.24 G0 (G0 = 2e2/h), indicating the formation of a well-defined single benzene molecule junction. B

Single-molecule junctions are ideal test beds for investigating the fundamentals of charge transport at the nanoscale. Conducting properties are strongly dependent on the metal-molecule interface geometry, which, however, is very poorly characterized due to numerous experimental challenges. We report on a new methodology for characterizing the adsorption site of single-molecule junctions through the combination of surface enhanced Raman scattering (SERS), current-voltage (<i>I</i>-<i>V</i>) curv

A 600-MHz single-chip multiprocessor, which includes two M32R 32-bit CPU cores , a 512-kB shared SRAM and an internal shared pipelined bus, was fabricated using a 0.15-/spl mu/m CMOS process for embedded systems. This multiprocessor is based on symmetric multiprocessing (SMP), and supports modified-exclusive-shared-invalid (MESI) cache coherency protocol. The multiprocessor inherits the advantages of previously reported single-chip multiprocessors, while its multiprocessor architecture is optimi

The electron transport through a single endohedral Ce@C${}_{82}$ metallofullerene bridging between metal electrodes was investigated with experimental (break junction) as well as theoretical (density functional theory coupled with the nonequilibrium Green's function formalism) techniques. The single Ce@C${}_{82}$ molecule junction showing a high and fixed conductance value was fabricated by direct binding of the metallofullerene to Ag electrodes. The junction had a conductance of 0.28(\ifmmode\p

The characterization of single-molecule structures could provide significant insights into the operation mechanisms of functional devices. Structural transformation via isomerization has been extensively employed to implement device functionalities. Although single-molecule identification has recently been achieved using near-field spectroscopy, discrimination between isomeric forms remains challenging. Further, the structure-function relationship at the single-molecule scale remains unclear. He

Electron transport through noncovalent interaction is of fundamental and practical importance in nanomaterials and nanodevices. Recent single-molecule studies employing single-molecule junctions have revealed unique electron transport properties through noncovalent interactions, especially those through a π-π interaction. However, the relationship between the junction structure and electron transport remains elusive due to the insufficient knowledge of geometric structures. In this article, we e

We report the fabrication of a highly conductive single pyrazine molecular junction with Pt leads. Mechanically controllable break-junction measurements at low temperatures show two distinct high and low conductance states. These conductance values are two orders of magnitude larger than those of a conventional single molecular junction with anchoring groups because of direct binding of the π conjugated molecule to a metal electrode with large density of states at the Fermi energy. Inelastic ele

A water molecule exhibits characteristic properties on the basis of hydrogen bonding. In the past decade, single water molecules placed in non-hydrogen-bonding environments have attracted growing attention. To reveal the fundamental properties of a single water molecule, endohedral fullerene H₂ O@C₆₀ is an ideal and suitable model. We examined the electronic properties of H₂ O@C₆₀ by performing single-molecule measurements. The conductance of a single

We investigated the change in the metal-molecule interaction in a 1,4-benzenedithiol (BDT) single-molecule junction using a combination of surface-enhanced Raman scattering spectra and current-voltage curves. During the stretching process, the conductance of the junction systematically decreased, accompanied by an increase in the vibrational energy of the CC stretching mode. By analyzing the current-voltage curves and Raman spectra, we found that the interaction between the π orbital of BDT and

We study the conductance and geometry of the Cu atomic junction in the presence of N2, through combination of experimental measurement and theoretical calculation. A mechanically controllable break-junction measurement at low temperature reveals N2 molecules stabilize a Cu atomic junction, and reduce its conductance value. The length analysis about the Cu atomic junction indicates that it is elongated with the length of a few atoms, although it is not elongated without molecules. We investigate

We have developed a system for the simultaneous measurement of electrical conductance and thermopower of the single benzenedithiol (BDT) molecular junction, which was characterized by inelastic electron tunneling spectroscopy, at low temperature. The simultaneous measurements revealed a negative correlation between the electrical conductance and the thermopower. Strong metal–molecule coupling at the single BDT molecular junction leads to high conductance and low thermopower because of the broade

Specifying the geometric and electronic structures of a metal-molecule interface at the single-molecule level is crucial for the improvement of organic electronics. A single-molecule junction (SMJ) can be used to investigate interfaces because it can be regarded as an elementary unit of the interface structure. Although considerable efforts have been made to this end, the detection of structural changes in SMJs associated with metal-molecule interactions remains challenging. In this study, we de

Broadband noise reduction has been investigated by embedding a high-density thin-film decoupling capacitor as much as 1 μF in a laminate package. A complex programmable logic device (CPLD) was mounted on the laminate package instead of bare chip as a noise generating circuits. Then, the package was mounted on an evaluation board. Eight output buffer circuits of the CPLD were simultaneous switched. Switching noise between the power and ground pads on the package has been dramatically reduced by t

We have studied surface-enhanced Raman scattering (SERS) of aminobenzenethiol (ABT) and benzenedithiol (BDT) single molecules bridging Au electrodes (single-molecule junction) at different bias voltages. The SERS intensity of the ABT single-molecule junction increased with the bias voltage, and the non-totally symmetric b2 mode appeared at a high bias voltage. Meanwhile, the SERS intensity did not change with the bias voltage in the case of the BDT single-molecule junction. The bias voltage-indu