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Hirakata, Japan

Suzuki T.,Kwansei Gakuin University | Itoh T.,Japan National Institute of Advanced Industrial Science and Technology | Vantasin S.,Kwansei Gakuin University | Minami S.,Kwansei Gakuin University | And 6 more authors.
Physical Chemistry Chemical Physics | Year: 2014

We develop a bulk silver tip for tip-enhanced Raman scattering (TERS) and obtain TERS spectra of epitaxial graphene on the carbon face of 4H-SiC(000-1) with a high signal-to-noise ratio. Thanks to the high quality of TERS spectra we firstly find that the G band in the TERS spectra exhibits position-by-position variations in both lower wavenumber shifts and spectral broadening. The analysis of the variations reveals that the shifts and broadenings have a linear correlation between each other, indicating that the variations are induced by the position dependent local stress on graphene based on a uniaxial strain model. © the Partner Organisations 2014. Source

Itoh T.,Japan National Institute of Advanced Industrial Science and Technology | Yamamoto Y.S.,Japan Society for the Promotion of Science | Yamamoto Y.S.,Kagawa University | Suzuki T.,Unisoku Co. | And 2 more authors.
Applied Physics Letters | Year: 2016

We report an evaluation method employing darkfield microspectroscopy for silver probes used in tip-enhanced Raman scattering (TERS). By adjusting the darkfield illumination, the diffracted light from the probe outlines disappears and the diffracted light from the surface nanostructures and tips of the probes appears as colorful spots. Scanning electron microscopy reveals that the spectral variations in these spots reflect the shapes of the surface nanostructures. The tip curvatures correlate to the spectral maxima of their spots. Temporal color changes in the spots indicate the deterioration due to the oxidation of the silver surfaces. These results show that the proposed method is useful for in situ evaluation of plasmonic properties of TERS probes. © 2016 AIP Publishing LLC. Source

Irita M.,Tokyo University of Science | Homma Y.,Tokyo University of Science | Miura T.,Unisoku Co.
e-Journal of Surface Science and Nanotechnology | Year: 2013

A single-walled carbon nanotube (SWNT) with well-defined structure has a potential as a probe of scanning microscopy. However, SWNT tip has not been applied to practical use yet because of the difficulty in the tip preparation. We have developed a technology for fabrication of SWNT tips with the yield rate of 25%. Various lengths and shapes of SWNT tips were examined as the probe of ultrahigh vacuum scanning tunneling microscopy (STM). We found that the length of SWNT was a crucial factor for the application to STM. Atomic-scale resolution could be obtained on the surface of highly oriented pyrolytic graphite with an SWNT tip shorter than 300 nm. In the case of ring type SWNT tip, which used the side wall of SWNT, the STM images depended on the scan direction due to the half-ring shape, and atomic-scale resolution could be obtained when scanned along the circumference direction of the ring. Although the stability of the SWNT tip during scanning needs to be improved, present results prove the potential of SWNT for STM probes. © 2013 The Surface Science Society of Japan. Source

Vantasin S.,Kwansei Gakuin University | Yan X.-L.,Japan National Institute of Advanced Industrial Science and Technology | Suzuki T.,Unisoku Co. | Ozaki Y.,Kwansei Gakuin University
e-Journal of Surface Science and Nanotechnology | Year: 2015

Various kinds of carbon nanotube-based and graphene-based nanomaterials are considered as future materials for electronic devices due to their outstanding properties. This review paper reports tip-enhanced Raman scattering (TERS) studies of polymer nanocomposites containing carbon nanomaterials and graphenes. TERS is an emerging spectroscopic tool that combines scanning probe microscopy and Raman spectroscopy. Compared with normal Raman spectroscopy, TERS has much better spatial resolution and sensitivity. The usefulness of TERS technique in studying structure and interactions of nanomaterials is demonstrated by introducing four TERS studies. © 2015 The Surface Science Society of Japan. Source

Isaka Y.,Japan Science and Technology Agency | Yamada Y.,Osaka City University | Suenobu T.,Japan Science and Technology Agency | Nakagawa T.,Unisoku Co. | And 2 more authors.
RSC Advances | Year: 2016

The production of hydrogen peroxide from water and dioxygen was achieved by combination of semiconductor-photocatalysed oxidation of water and photocatalytic two-electron reduction of dioxygen with [RuII((MeO)2bpy)3]2+ ((MeO)2bpy = 4,4′-dimethoxy-2,2′-bipyridine) in the presence of Sc3+ in water under visible light irradiation. © 2016 The Royal Society of Chemistry. Source

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