Miho Fujihara

University of Miyazaki

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Hisanori Shinohara

Nagoya University

Yasumitsu Miyata

Tokyo Metropolitan University

Ryo Kitaura

National Institute for Materials Science

Ryosuke Inoue

National Defense Medical College

Yutaka Maniwa

Kanagawa University

Hong En Lim

Saitama University

Stephan Irle

Oak Ridge National Laboratory

Susumu Okada

University of Tsukuba

Marie Suzuki

Nagoya University

Haruka Omachi

Nagoya University

Cooperative Institutions

The University of Tokyo

Nagoya University

National Institute of Advanced Industrial Science and Technology

Japan Science and Technology Agency

Tokyo Metropolitan University

Kyoto University

Tokyo University of Science

National Institute for Materials Science

Nagoya University Hospital

University of Tsukuba

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Optical properties of highly-extended, ultrathin graphene nanoribbons in carbon nanotubes

Bulletin of the American Physical Society (2015)

Hong En Lim Yasumitsu Miyata Miho Fujihara Susumu Okada Haruka Omachi

Carbon fibers

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Fabrication and Optical Probing of Highly Extended, Ultrathin Graphene Nanoribbons in Carbon Nanotubes

ACS Nano (2015)

Hong En Lim Yasumitsu Miyata Miho Fujihara Susumu Okada Zheng Liu

Nanotemplated growth of graphene nanoribbons (GNRs) inside carbon nanotubes is a promising mean to fabricate ultrathin ribbons with desired side edge configuration. We report the optical properties of the GNRs formed in single-wall carbon nanotubes. When coronene is used as the precursor, extended GNRs are grown via a high-temperature annealing at 700 °C. Their optical responses are probed through the diazonium-based side-wall functionalization, which effectively suppresses the excitonic absorption peaks of the nanotubes without damaging the inner GNRs. Differential absorption spectra clearly show two distinct peaks around 1.5 and 3.4 eV. These peaks are assigned to the optical transitions between the van Hove singularities in the density of state of the GNRs in qualitative agreement with the first-principles calculations. Resonance Raman spectra and transmission electron microscope observations also support the formation of long GNRs.

Coronene

10.1021/nn507408m

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Selective formation of zigzag-edges in graphene cracks

Bulletin of the American Physical Society (2015)

Miho Fujihara Ryosuke Inoue Yutaka Maniwa Hisanori Shinohara Yasumitsu Miyata

Zigzag

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Visible fluorescence from 5-Angstrom single-wall carbon nanotubes

Bulletin of the American Physical Society (2012)

Yasumitsu Miyata Toshiya Nakamura Miho Fujihara Hong En Lim Ryo Kitaura

Angstrom

Carbon fibers

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Clean and polymer-free transfer of CVD-grown graphene films on hexagonal boron nitride substrates

Japanese Journal of Applied Physics (2017)

Miho Fujihara Shun Ogawa Shintaro Yoshimura Ryosuke Inoue Yutaka Maniwa

This report describes the development of a solution-assisted, polymer-free transfer method and the characterization of chemical vapor deposition (CVD)-grown graphene on hexagonal boron nitride. Raman analysis reveals that polymer-free samples have small variations in G- and 2D-mode Raman frequencies and are minimally affected by charge doping as observed for clean exfoliated graphene. Electrical measurements indicate that charge doping, hysteresis, and carrier scattering are suppressed in polymer-free samples. The results demonstrate that this method provides a simple and effective way to prepare clean heterostructures of CVD-grown, large-area graphene and other two-dimensional materials.

Hexagonal boron nitride

10.7567/jjap.56.055102

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Solution-Phase Extraction of Ultrathin Inner Shells from Double-Wall Carbon Nanotubes

ACS Nano (2010)

Yasumitsu Miyata Marie Suzuki Miho Fujihara Yuki Asada Ryo Kitaura

We present an efficient method to extract inner shells of double-wall carbon nanotubes (DWCNTs) in liquid phase. The extraction of inner from outer shells is achieved by cutting the DWCNTs with vigorous sonication in water containing surfactants. The extracted shells are perfectly isolated single-wall carbon nanotubes (SWCNTs) and can be separated using density gradient ultracentrifugation. Statistical analysis using high-resolution transmission electron microscopy reveals that the enrichment of SWCNTs with narrow diameter (0.62−1.0 nm) up to 100% is achieved from highly pure DWCNTs. Furthermore, the (5,4) SWCNTs, which have the diameter of 0.62 nm, are concentrated. Our findings provide a novel way to obtain very narrow, highly isolated SWCNTs with ultraclean surface that have not been obtained in conventional synthesis methods.

Sonication

Carbon fibers

10.1021/nn1015665

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Citations (45)

Structural control of graphene edges by in-plane cleavage

The Japan Society of Applied Physics (2014)

Miho Fujihara

Cleavage (geology)

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