A5046427078- Molecular Junctions and Nanostructures
- Quantum and electron transport phenomena
- Surface Chemistry and Catalysis
- Quantum Dots Synthesis And Properties
- Carbon Nanotubes in Composites
- Spectroscopy and Quantum Chemical Studies
- Mechanical and Optical Resonators
- Force Microscopy Techniques and Applications
- Advanced Electron Microscopy Techniques and Applications
- Molecular Communication and Nanonetworks
- Advanced Chemical Physics Studies
- bioluminescence and chemiluminescence research
- Nanotechnology research and applications
- Plasmonic and Surface Plasmon Research
- Photochemistry and Electron Transfer Studies
- Terahertz technology and applications
- Surface and Thin Film Phenomena
- Fullerene Chemistry and Applications
- Energetic Materials and Combustion
- Advanced Fluorescence Microscopy Techniques
- Fire dynamics and safety research
- Online Learning and Analytics
- Metallurgy and Material Forming
- Combustion and Detonation Processes
- Organic Electronics and Photovoltaics
RIKEN
2016-2025
Pioneer (Japan)
2024-2025
The University of Tokyo
1997-2019
Nippon Soken (Japan)
2017
Hiroshima University
2011-2015
National Institute for Materials Science
2004-2006
Nara Institute of Science and Technology
2002
Intrinsic molecular fluorescence from porphyrin molecules on Au(100) has been realized by using a nanoscale multimonolayer decoupling approach with nanoprobe excitation in the tunneling regime. The origin of luminescence is established observed well-defined vibrationally resolved spectra. fluoresce at low "turn-on" voltages for both bias polarities, suggesting an mechanism via hot electron injection either tip or substrate. excited decay radiatively through Franck-Condon pi(*)-pi transitions.
We investigate the near-field interaction between an isolated free-base phthalocyanine molecule and a plasmon localized in gap NaCl-covered Ag(111) surface tip apex of scanning tunneling microscope. When is located close proximity molecule, asymmetric dips emerge broad luminescence spectrum generated by current. The origin explained energy transfer molecular excitons quantum mechanical interference effect, where vibrations provide additional degrees freedom dynamic process.
Single-molecule nanospectroscopy Microscopic understanding and molecular-level control of individual electronic quantum states a single molecule are long-standing challenge in spectroscopy. Imada et al. found that narrow-line tunable laser combined with scanning tunneling microscope was able to generate photoluminescence spectra the vibrational molecules micro–electron volt energy resolution submolecular spatial resolution. The authors also discovered way tune levels through linear Stark...
Electron transport and optical properties of a single molecule in contact with conductive materials have attracted considerable attention because their scientific importance potential applications. With the recent progress experimental techniques, especially by virtue scanning tunneling microscope (STM)-induced light emission, where current STM is used as an atomic-scale source for induction emission from molecule, it has become possible to investigate single-molecule at subnanometer spatial...
Coupling an intense electric field of terahertz (THz) pulse to a scanning tunneling microscope (STM) has opened new avenues for conducting ultrafast electron manipulation and tracking quantum dynamics at the nanometer spatial resolution. Here we combined THz-field-driven STM with photon detection system demonstrated nanospectroscopic investigations STM-induced luminescence triggered by electrons. Owing abundant spectral information on photons, were able separately measure characterize from...
The ultrafast manipulation of molecular states by charge transfer is essential for characterizing and controlling dynamics. In this study, we demonstrated exciton formation in a single molecule through electron tunneling processes between metal tip scanning microscope (STM) using phase-controlled terahertz (THz) pulse. pronounced luminescence the well-defined system under distinct carrier-envelope phase THz pulse revealed that sequential state-selective electron-tunneling to frontier...
The combination of terahertz (THz) pulses with scanning tunneling microscopy (STM) enables us to investigate ultrafast dynamics at material surfaces high spatial (nanoscale) and temporal (femtosecond) resolution. In this Perspective, we review the basic principles THz-STM, outline related literature, discuss its future outlook capable advancing nanoscience, especially by introducing further THz-STM luminescence spectroscopy, which can extract more fruitful information about nanoscale...
Nanoscale organic electroluminescence was induced by positioning a sharp tungsten tip on the surface of free-base porphyrin $({\mathrm{H}}_{2}\mathrm{TBPP})$ monolayer top PtTBP (PtTBPP) multilayers Cu(100) substrate in an ultrahigh vacuum scanning tunneling microscope (STM) system. The well-defined molecular fluorescence spectra are perfectly matched with conventional photoluminescence spectrum from bulk ${\mathrm{H}}_{2}\mathrm{TBPP}$ molecules. nanoscale PtTBPP do not fluoresce; rather,...
We investigate adsorption effects of copper phthalocyanine molecules on excitons and trions in air-suspended carbon nanotubes. Using photoluminescence excitation spectroscopy, we observe that exciton energy redshifts gradually with the molecular deposition thickness. The trion emission is also observed at large amounts, which indicates charge transfer between Analysis spectra for individual tubes reveal a correlation exciton-trion separation energy, showing many-body interaction energies...
Exciton dynamics governs versatile functions of molecules such as photon emission, photovoltaic and photo chemical reactions. For clarifying the excitons in a molecule, an optical measurement with high spatiotemporal resolution is required because have short lifetimes their behavior local region important for properties. Luminescence spectroscopy based on scanning tunneling microscope (STM) enable to investigate properties sub-nanometer spatial [1-2] . In this method, luminescence (STL)...
In this paper, effects of the difference between air injection velocity and fuel on rapidly mixed tubular flame have been investigated. A parameter αst which is ratio to at stoichiometric condition has introduced, five burners with different αst, 0.6, 1.2, 2.4, 6.0 11.9 were examined. Stability limits propane-air local concentrations unburned mixture determined. Results show that, = 0.6 in burner a stable can be established range Φ 0.45 2.1 0.48 2.15. When increased almost two times higher...
Energy transfer is an essential process in photosynthesis and various energy-harvesting devices. So far, nanoscale features of energy transfers are unknown because the limited spatial resolution conventional methods. We conducted a molecular-level investigation molecular dimers consisting free-base phthalocyanine magnesium (H2Pc MgPc) by scanning tunneling luminescence spectroscopy. Local excitation MgPc with current microscope give rise to from nearby H2Pc as result transfer. demonstrate...