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Your search keyword '"Suematsu, Hiroyoshi"' showing total 2 results
Start Over Author "Suematsu, Hiroyoshi" Topic nanotubes
2 results on '"Suematsu, Hiroyoshi"'

1. Photoconductivity of single-walled carbon nanotubes.

Author

Fujiwara, Akihiko, Matsuoka, Yasuyuki, Suematsu, Hiroyoshi, Ogawa, Naoki, Miyano, Kenjiro, Kataura, Hiromichi, Maniwa, Yutaka, Suzuki, Shinzou, and Achiba, Yohji

Subjects
PHOTOCONDUCTIVITY, NANOTUBES, CARBON
Abstract

We have investigated photoconducting properties of mat samples of singlewalled carbon nanotubes (SWNTs) in order to clarify the mechanism of photoconductivity. Two peaks are observed in photoconductivity spectra around 0.7 and 1.2 eV for both samples of SWNTs synthesized by arc discharge and laser ablation methods, which can be interpreted as the photocurrent in the semiconductor phase of nanotubes. No threshold in applied voltage is observed for the occurrence of photoconductivity. Results show that the photoconductivity is an intrinsic feature of SWNTs and that junction areas do not play an important role on photoconductivity. [ABSTRACT FROM AUTHOR]

Published
2001

2. Local current density detection of individual single-wall carbon nanotubes in a bundle.

Author

Fujiwara, Akihiko, Iijima, Ryosuke, Ishii, Kenji, Suematsu, Hiroyoshi, Kataura, Hiromichi, Maniwa, Yutaka, Suzuki, Shinzo, and Achiba, Yohji

Subjects
NANOTUBES, ATOMIC force microscopy
Abstract

We have measured the local current density on individual single-wall carbon nanotubes (SWNTs) with the conducting tip of an atomic force microscope; the SWNTs make up a nanometer-scale electronic circuit on an insulating substrate. Scanning tunneling spectroscopy measurements at certain positions on a SWNT bundle show that both metallic and semiconducting nanotubes can coexist in a bundle. The approach applied in this experiment appears as a powerful technique for the investigation of the spatial variation of current density and electronic states of nanometer-scale electronic devices. [ABSTRACT FROM AUTHOR]

Published
2002
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