Search Results - "Umezu, I."

Optical properties of single-wall carbon nanotubes by Kataura, H., Kumazawa, Y., Maniwa, Y., Umezu, I., Suzuki, S., Ohtsuka, Y., Achiba, Y.

“…Four kinds of single-wall carbon nanotubes (SWNTs) with different diameter distribution have been synthesized and optical absorption spectra have been…”
Get full text

Effects of surface adsorption on the photoluminescence wavelength of silicon nanocrystal by Umezu, I., Kimura, T., Sugimura, A.

“…Surface-passivated silicon nanocrystallites were prepared by pulsed laser ablation in hydrogen gas, and the photoluminescence (PL) properties were measured by…”
Get full text

Resonance energy transfer based on shallow and deep energy levels of biotin-polyethylene glycol/polyamine stabilized CdS quantum dots by Lü, W., Tokuhiro, Y., Umezu, I., Sugimura, A., Nagasaki, Y.

“…Fluorescent resonance energy transfer between the poly(ethylene glycol)-b-poly(2-(N,N-dimethylamino)ethyl methacrylate) stabilized CdS quantum dots (QDs) and…”
Get full text

Structural and optical properties of silicon nanoparticles prepared by pulsed laser ablation in hydrogen background gas by MAKINO, T, INADA, M, YOSHIDA, K, UMEZU, I, SUGIMURA, A

“…We studied the structural and optical properties of silicon (Si) nanoparticles (np-Si) prepared by pulsed laser ablation (PLA) in hydrogen (H2) background gas…”
Get full text

Spatial fluctuation enhancement and nonradiative-recombination-center generation due to high Si-doping into GaAs/AlAs short-period-superlattices by Kobori, H., Shigetani, A., Umezu, I., Sugimura, A.

“…Through the time-resolved photoluminescence (TR-PL) measurement for excitons, we have studied the enhancement of spatial fluctuation (SF) and the generation of…”
Get full text

Effects of hydrogen on Si nanoparticles formed by pulsed laser ablation by Inada, M, Nakagawa, H, Umezu, I, Sugimura, A

“…We examined reactive pulsed laser ablation of silicon target in hydrogen atmosphere to form hydrogenated silicon nanoparticles. A correlation between hydrogen…”
Get full text

Correlation between surface oxide and photoluminescence properties of Si nanoparticles prepared by pulsed laser ablation by UMEZU, I, MATSUMOTO, K, INADA, M, MAKINO, T, SUGIMURA, A

“…Hydrogenated silicon nanoparticles were prepared by pulsed laser ablation (PLA) of Si target in hydrogen gas. We observed native oxidation process for 250 days…”
Get full text

Effects of hydrogenation on photoluminescence of Si nanoparticles formed by pulsed laser ablation by Inada, M., Nakagawa, H., Umezu, I., Sugimura, A.

“…We report a photoluminescence (PL) study of hydrogenated Si nanoparticles formed by pulsed laser ablation. Two kinds of visible luminescence centered at 480…”
Get full text

Effects of argon and hydrogen plasmas on the surface of silicon by Umezu, I, Kohno, K, Aoki, K, Kohama, Y, Sugimura, A, Inada, M

“…We investigated the effects of argon and hydrogen plasmas on the structure and electrical properties of the surface of silicon wafers. Surface roughness and…”
Get full text

Preparation of SiNx film by pulsed laser ablation in nitrogen gas ambient by Umezu, I, Yamaguchi, T, Kohno, K, Inada, M, Sugimura, A

Get full text

Preparation of SiN x film by pulsed laser ablation in nitrogen gas ambient by Umezu, I, Yamaguchi, T, Kohno, K, Inada, M, Sugimura, A

“…Silicon nitride films were synthesized by reactive pulsed laser ablation (PLA) of a Si target in N 2 gas atmosphere. At different laser fluences and N 2 gas…”
Get full text

Recombination process of CdS quantum dot covered by novel polymer chains by Umezu, I, Koizumi, R, Sugimoto, A, Inada, M, Makino, T, Sugimura, A, Sunaga, Y, Ishii, T, Nagasaki, Y

“…An organic–inorganic compound was prepared by adding organic material to inorganic, semiconductor nanoparticles. Polyethylene glycol, tethered chains (PEG-TC)…”
Get full text

Nano-oxidation of an amorphous silicon surface with an atomic force microscope by Umezu, I, Yoshida, T, Matsumoto, K, Inada, M, Sugimura, A

“…A surface anodization technique was applied to an amorphous silicon (a-Si) surface by means of an atomic force microscope (AFM). The oxide line height…”
Get full text

Optical and transport studies in coupled InAs quantum dots embedded in GaAs by Inada, M, Umezu, I, Vaccaro, P.O, Yamada, S, Sugimura, A

“…We studied optical and electron transport properties of coupled InAs quantum dots (QDs) embedded in GaAs. Photoluminescence (PL) from the high dot density…”
Get full text

Conduction-type control of Ge films grown on (NH 4) 2S-treated GaAs by molecular beam epitaxy by Inada, M, Fujishima, T, Umezu, I, Sugimura, A, Yamada, S

“…We have performed epitaxial growth of Ge films on (NH 4) 2S-treated GaAs (0 0 1) substrates under various growth temperatures using molecular beam epitaxy. We…”
Get full text

Optical properties of self-assembled InAs quantum dots grown on GaAs(211)A substrate by Sugimura, A, Ohnishi, K, Umezu, I, Vaccaro, P.O

“…We have investigated the photoluminescence (PL) and growth properties of self-assembled InAs/GaAs quantum dots (QD) grown on (211)A-oriented GaAs substrate in…”
Get full text

Optical properties of CdS nanocrystal covered by polymer chains on the surface by Umezu, I., Koizumi, R., Mandai, K., Aoki-Matsumoto, T., Mizuno, K., Inada, M., Sugimura, A., Sunaga, Y., Ishii, T., Nagasaki, Y.

“…We prepared novel CdS nanocrystal by colloid technique; CdS nanocrystal possessing polyethylene glycol tethered chains (PEG-TC) on the surface. A relatively…”
Get full text

A comparative study of the photoluminescence properties of a-SiOx:H film and silicon nanocrystallites by Umezu, I., Yoshida, K., Sugimura, A., Inokuma, T., Hasegawa, S., Wakayama, Y., Yamada, Y., Yoshida, T.

“…Photoluminescence (PL) properties in a-SiOx and Si crystallites with nanometer dimensions were compared to investigate recombination processes and to reveal…”
Get full text

Synthesis of Ni-doped InTaO(4) nanocrystallites by reactive pulsed laser ablation for application to visible-light-operating photocatalysts by Yoshida, T, Toyoyama, H, Umezu, I, Sugimura, A

“…Ni-doped InTaO(4) nanocrystallites were synthesized by a reactive pulsed laser ablation process, aiming at visible-light-operating photocatalysts. The third…”
Get full text

Nano-oxidation of vanadium thin films using atomic force microscopy by VACCARO, P. O, SAKATA, S, YAMAOKA, S, UMEZU, I, SUGIMURA, A

“…We successfully applied the AFM nano-oxidation process to vanadium thin films for the first time. The oxidized line width is smaller and the height is higher…”
Get full text