研究者詳細 - 旭　良司

論文 - 旭　良司

分割表示 170 件中 141 - 160 件目／全件表示 >>

大脇健史, 森川健志, 青木恒勇, 旭良司, 多賀康訓, 磯村典武

表面科学 : hyomen kagaku = Journal of the Surface Science Society of Japan 24 巻 ( 1 ) 頁： 25 - 30 2003年1月

記述言語：日本語掲載種別：研究論文（その他学術会議資料等）出版者・発行元：公益社団法人日本表面科学会

N-doped titanium oxide photocatalyst is found to be activated by visible light irradiation as well as ultraviolet irradiation. We evaluated its crystal structure, N states in the lattice, composition, and surface morphology using X-ray diffiraction (XRD), X-ray photoemission spectroscopy (XPS), and scanning probe microscopy (SPM). As a result, it is found that the materials have rutile or anatase crystal structure with nitrogen doped into substitutional sites of oxygen in TiO2, which contributes band gap narrowing. It is also confirmed that XPS measurement was influenced by surface treatment such as Ar ion bombardment.

DOI： 10.1380/jsssj.24.25

Accurate first-principles detailed-balance determination of Auger recombination and impact ionization rates in semiconductors 査読有り

Picozzi S, Asahi R, Geller CB, Freeman AJ

PHYSICAL REVIEW LETTERS 89 巻 ( 19 ) 2002年11月

Impact Ionization in GaAs within A Screened Exchange Density Functional Formalism 査読有り

Picozzi S.

Journal of Computational Electronics 1 巻 ( 3 ) 頁： 421 - 424 2002年10月

First-principles calculations for understanding high conductivity and optical transparency in InxCd1-x films 査読有り

Asahi R, Wang A, Babcock JR, Edleman NL, Metz AW, Lane MA, Dravid VP, Kannewurf CR, Freeman AJ, Marks TJ

THIN SOLID FILMS 411 巻 ( 1 ) 頁： 101 - 105 2002年5月

Surface properties of the refractory metal-nitride semiconductor ScN: Screened-exchange LDA-FLAPW investigations 査読有り

Stampfl C, Asahi R, Freeman AJ

PHYSICAL REVIEW B 65 巻 ( 16 ) 頁： 1 - 4 2002年4月

Impact ionization in GaAs: A screened exchange density-functional approach 査読有り

Picozzi S, Asahi R, Geller CB, Continenza A, Freeman AJ

PHYSICAL REVIEW B 65 巻 ( 11 ) 頁： 1 - 4 2002年3月

Photocatalysts sensitive to visible light - Response 査読有り

Asahi R, Morikawa T, Ohwaki T, Aoki K, Taga Y

SCIENCE 295 巻 ( 5555 ) 頁： 627 - 627 2002年1月

Electronic structure of misfit-layered calcium cobaltite 査読有り

Asahi R, Sugiyama J, Tani T, Xia CT

XXI INTERNATIONAL CONFERENCE ON THERMOELECTRICS, PROCEEDINGS ICT '02 頁： 203 - 206 2002年

Excited states and optical properties entirely from first principles: Extended FLAPW method and its graphical user interface 査読有り

Kim MY, Asahi R, Freeman AJ

JOURNAL OF COMPUTER-AIDED MATERIALS DESIGN 9 巻 ( 3 ) 頁： 173 - 201 2002年

Electronic structure of misfit-layered calcium cobaltite 査読有り

Asahi R., Sugiyama J., Tani T.

Physical Review B - Condensed Matter and Materials Physics 66 巻 ( 15 ) 頁： 1 - 7 2002年

Electronic structure of misfit-layered calcium cobaltite 査読有り

Asahi R.

International Conference on Thermoelectrics, ICT, Proceedings 2002-January 巻頁： 203 - 206 2002年

Effect of GGA on the half-metallicity of the itinerant ferromagnet CoS2 査読有り

Shishidou T, Freeman AJ, Asahi R

PHYSICAL REVIEW B 64 巻 ( 18 ) 2001年11月

Electronic structure and small polaron hole transport of copper aluminate 査読有り

Ingram BJ, Mason TO, Asahi R, Park KT, Freeman AJ

PHYSICAL REVIEW B 64 巻 ( 15 ) 2001年10月

Computational band-structure engineering of III-V semiconductor alloys 査読有り

Geller CB, Wolf W, Picozzi S, Continenza A, Asahi R, Mannstadt W, Freeman AJ, Wimmer E

APPLIED PHYSICS LETTERS 79 巻 ( 3 ) 頁： 368 - 370 2001年7月

Visible-light photocatalysis in nitrogen-doped titanium oxides 査読有り

Asahi R, Morikawa T, Ohwaki T, Aoki K, Taga Y

SCIENCE 293 巻 ( 5528 ) 頁： 269 - 271 2001年7月

Indium-cadmium-oxide films having exceptional electrical conductivity and optical transparency: Clues for optimizing transparent conductors 査読有り

Wang A, Babcock JR, Edleman NL, Metz AW, Lane MA, Asahi R, Dravid VP, Kannewurf CR, Freeman AJ, Marks TJ

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 98 巻 ( 13 ) 頁： 7113 - 7116 2001年6月

Band-Gap Narrowing of Titanium Dioxide by Nitrogen Doping 査読有り

Morikawa Takeshi, Asahi Ryoji, Ohwaki Takeshi, AOKI Koyu, TAGA Yasunori

Japanese journal of applied physics. Pt. 2, Letters 40 巻 ( 6 ) 頁： L561 - L563 2001年6月

Electronic structure and physical properties of early transition metal mononitrides: Density-functional theory LDA, GGA, and screened-exchange LDA FLAPW calculations 査読有り

Stampfl C, Mannstadt W, Asahi R, Freeman AJ

PHYSICAL REVIEW B 63 巻 ( 15 ) 2001年4月

Band-Gap Narrowing of Titanium Dioxide by Nitrogen Doping. 査読有り

Morikawa Takeshi, Asahi Ryoji, Ohwaki Takeshi, Aoki Koyu, Taga Yasunori

Japanese Journal of Applied Physics 40 巻 ( 6 ) 頁： L561 - L563 2001年

記述言語：英語掲載種別：研究論文（その他学術会議資料等）出版者・発行元：The Japan Society of Applied Physics

TiO2-based powder, including 0.1 at% of N doped in the rutile lattice, has been synthesized by oxidation of TiN. As a result, a significant shift of the absorption edge to a lower energy in the visible-light region has been observed. The substitutional doping of N into the TiO2 lattice is found to be effective; its 2p states contribute to the band-gap narrowing by mixing with O 2p as shown in ab initio electronic structure calculations.

DOI： 10.1143/JJAP.40.L561

Effect of GGA on the half-metallicity of the itinerant ferromagnet CoS2 査読有り

Shishidou T., Freeman, A.J., Asahi, R.

Physical Review B - Condensed Matter and Materials Physics 64 巻 ( 18 ) 2001年

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