論文 - 井田 隆
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Plasmon absorption of gold nanoparticles and their morphologies observed by AFM（共著） 査読あり
H. ISHIKAWA, T. IDA, K. KIMURA
Surface Review and Letters 3 ( 1 ) 1153 - 1156 1996年02月
記述言語：英語 掲載種別：研究論文（学術雑誌）
We have studied the effect of heat treatment on Au-island film prepared by a sputtering method, atomic force microscopy (AFM), and UV-VIS spectrophotometry. The structure and absorption spectrum of Au-island film are significantly changed by heat treatment, which corresponds to the visible color change from blue to red. In order to elucidate the relation between the structural and optical changes, we have simulated the change of spectrum using the Maxwell-Garnett theory. The calculated spectra are qualitatively in agreement with the experimental spectra.
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Structure and solid-state properties of the stable ring-oxidized conductor CoPc(AsF<sub>6</sub>)<sub>0.5</sub>: interaction between ring pi-electrons and cobalt d-electrons（共著） 査読あり
H. Yamakado, T. Ida, A. Ugawa, K. Yakushi, K. Awaga, Y. Maruyama, K. Imaeda, H. Inokuchi
Synthetic Metals 62 ( 2 ) 169 - 178 1994年01月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Structure and solid state properties of the conductive salt of (phthalocyaninato) cobalt, CoPc(AsF<sub>6</sub>)<sub>0.5</sub>（共著） 査読あり
K. Yakushi, H. Yamakado, T. Ida, A. Ugawa, K. Awaga, Y. Maruyama, K. Imaeda, H. Inokuchi
Synthetic Metals 56 ( 1 ) 1699 - 1704 1993年03月
記述言語：英語 掲載種別：研究論文（学術雑誌）
A conducting crystal of (phthalocyaninato)cobalt hexafluoroarsenate CoPc(AsF6)0.5 is prepared by an electrochemical method. Temperature-dependent electrical conductivity of dc and 9.4 GHz shows that CoPc(AsF6)0.5 is a narrow-gap semiconductor with activation energies of 327 K for dc and 138 K for 9.4 GHz. Thermoelectric power is +40 μV/K - +50μV/K in the range 100–300 K. The sign of the thermoelectric power is consistent with our earlier spectroscopic result that Pc ring is mainly oxidized contrary to the analogous material CoPcI. Optical spectrum along the c axis exhibits strong and weak peaks at 0.29 eV and 1.2 eV. Magnetic susceptibility is composed of a Curie-Weiss part with C = 0.056 emu mol−1 and a nearly temperature-independent part with the magnitude of 5 × D−4 emu/mol/ All these data indicates the localizaion of holes (U>4t) like in (TMTTF)2X and Ag(DMe-DCNQI)2. This localization seems to be related to the exchange interaction between the unpaired d-electron on Co and the π-electron on macrocyclic ligand.
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Measurement of magnetic susceptibility of magnesium ultrafine particles（共著） 査読あり
T. Ida, K. Kimura
Zeitschrift fur Physik D 26 ( Supplement 1 ) S140 - S142 1993年03月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
The static magnetic susceptibilities of Mg fine particles have been measured by Faraday method, varying the temperature from 2 to 300 K and the magnetic field up to 5 T. The experimental results show diamagnetic deviation of fine particles from bulk magnetizatiion in the higher field region than ~1 T. It suggests size dependent saturation of paramagnetism or enhancement of diamagnetism in a high magnetic field.
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Structure of the charge-transfer complex of (DBTTF)(BTDA-TCNQ) （共著） 査読あり
K. Iwasaki, T. Ida, A. Kawamoto, A. Ugawa, Y. Yamashita, K. Yakushi, T. Suzuki
Acta Crystallographica C 48 ( 11 ) 1982 - 1984 1992年11月
記述言語：英語 掲載種別：研究論文（学術雑誌）
2-(1,3-Benzodithiol-2-ylidene)-1,3-benzodithiolo-2,2'-(4,6,10,12-tetraaza-5,11-dithiatricyclo-[7.3.0.0]dodeca-3,6,9,12-tetraene-2,8-diylidene)bis-propanedinitrile, (DBTTF)(BTDA-TCNQ), C14H8S4-C12N8S2, M=624.8, orthorhombic, Pnmn, a = 12.940(3), b=13.551(3), c=7.440(2)Å, V=1304.6(5)Å<sup>3</sup>, Z=2, Dm=1.60, Dx=1.59 g cm<sup>-3</sup>, λ(Mo Kα)=0.71073Å, μ=4.96 cm<sup>-1</sup>, F(000)=632, T=293K, R=0.067 (wR=0.062) for 1028 reflections. The components of the complex, DBTTF (donor) and BTDA-TCNQ (acceptor), form a mixed-stack column along the c axis. There are no intermolecular contacts shorter than the sum of the van der Waals radii within the molecular stack and between the stacks.
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Polarized reflectance spectra of single crystals of the phthalocyanine radicals NiPc(AsF<SUB>6</SUB>)<SUB>0.5</SUB>, H<SUB>2</SUB>Pc(AsF</SUB>6</SUB>)<SUB>0.67</SUB>, and LiPc（共著） 査読あり
K. Yakushi, T. Ida, A. Ugawa, H. Yamakado, H. Ishii, H. Kuroda
The Journal of Physical Chemistry 95 ( 20 ) 7636 - 7641 1991年10月
記述言語：英語 掲載種別：研究論文（学術雑誌）
DOI： 10.1021/j100173a016
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Pressure dependence of the polarized reflectance spectrum of a solid charge-transfer complex, perylene-hexacyanobutadiene (HCBD)（共著） 査読あり
T. Ida, K. Yakushi, H. Kuroda, H. Yamochi, G. Saito
Chemical Physics 156 ( 1 ) 113 - 122 1991年09月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
The polarized reflectance spectrum of the perylene-HCBD complex has been measured at high pressures up to 26 kbar. Extraordinary intensity of the charge-transfer band is observed at high pressures, which cannot be reproduced by a conventional analytical model such as a dimer or trimer model. It is shown that this intensity can be naturally explained by applying the results of diagrammatic valence-bond calculations for an infinite-chain model, which has been reported by Painelli et al. [J. Chem. Phys. 87 (1987) 1705]. The degree of charge transfer varrho, the transfer integral t, and the site-energy difference from the donor to acceptor Δ at each pressure are estimated, and the pressure dependence of t and Δ is found to be ∂ ln t/∂P = +2.9% kbar−1 and ∂Δ/∂P = −9.6 meV kbar−1, respectively.
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d-pi Interaction in conducting phthalocyaninatocobalthexafluoroarsenate, CoPc(AsF<SUB>6</SUB>)<SUB>0.5</SUB>（共著） 査読あり
Kyuya Yakushi, Hideo Yamakado, Takashi Ida, Akito Ugawa
Solid State Communications 78 ( 10 ) 919 - 923 1991年06月
記述言語：英語 掲載種別：研究論文（学術雑誌）
The spectroscopic study of semiconductive CoPc(AsF6)0.5 evidences the ligand-centered oxidation. The possible origin of the semiconductive band gap is related to the magnetic interaction between the itinerant π-electrons on the ligand channel and the unpaired d-electrons interacting antiferromagnetically within the Co2+ channel.
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Polarized reflectance spectra of DCNQI salts（共著） 査読あり
Kyuya Yakushi, Akito Ugawa, Gen Ojima, Takashi Ida, Hiroyuki Tajima, Akiko Koayashi, Reizo Kato, Hayao Kobayashi
Molecular Crystals and Liquid Crystals 181 217 - 231 1990年04月
記述言語：英語 掲載種別：研究論文（学術雑誌）
Temperature dependence of the polarized reflectance spectra have been measured on the single crystals of (DMe-DCNQI)2Ag, (DMe-DCNQI)2Na, (MeBr-DCNQI)2Cu, and (DMe-DCNQI)2-Cu (DCNQI stands for dicyanoquinonediimine). The optical spectra evidence one-dimensional band structures of Ag- and Na-salts and anisotropic three-dimensional ones of Cu-salts. The dimensionality crossover is found in (MeBr-DCNQI)2Cu around the metal-insulator phase transition.
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High-pressure optical study of partially oxidized metallophthalocyanines and metallotetrabenzoporphyrins（共著） 査読あり
Takashi Ida, Hideo Yamakado, Hideki Masuda, Kyuuya Yakushi, Daisuke Kanazawa, Hiroyuki Tajima, Haruo Kuroda
Molecular Crystals and Liquid Crystals 181 243 - 252 1990年04月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
The reflectance spectra of (phthalocyaninato)-nickel(II) hexafluoroarsenate ([Ni(pc)]2AsF6) and (tetrabenzoporphyrinato)nickel(II) hexafluoroarsenate ([Ni(tbp)]3(AsF6)(C10H7Cl)) were measured at high pressures. The pressure dependence of the reflectance spectrum of [Ni(pc)]2AsF6 suggests that the charge-carrying hole moves from the organic ligand to the central metal ion under high pressure.
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Reflectance spectra of DCNQI salts（共著）
H. Tajima, G. Ojima, T. Ida, H. Kuroda, A. Kobayashi, R. Kato, H. Kobayashi, A. Ugawa, K. Yakushi
The Physics and Chemistry of Organic Superconductors 51 ( 1 ) 49 - 53 1990年04月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Optical spectra of highly conducting phthalocyanine salts（共著）
K. Yakushi, H. Yamakado, T. Ida, A. Ugawa, H. Masuda, H. Kuroda
The Physics and Chemistry of Organic Superconductors 51 ( 1 ) 54 - 57 1990年04月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Microwave conductivity of the phthalocyanine anddicyanoquinonediimine salts（共著）
H. Yamakado, A. Ugawa, T. Ida, K. Yakushi
The Physics and Chemistry of Organic Superconductors 51 ( 1 ) 311 - 314 1990年04月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Takashi Ida, Kyuya Yakushi, Haruo Kuroda
The Journal of Chemical Physics 91 ( 6 ) 3450 - 3455 1989年09月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
The polarized reflectance spectrum of the perylene–TCNQ complex has been measured at high pressure up to 27 kbar using a diamond anvil cell incorporated into a microspectrophotometer. The degree of charge transfer (ρ), the transfer integral (t), and the site‐energy difference (Δ) are estimated at each pressure from analysis of the charge‐transfer band. The pressure dependences of t and Δ are found to be ∂ ln t/∂P=+2.3% kbar−1 and ∂Δ/∂P=−6.4 MeV kbar−1, respectively. It is shown that the observed pressure dependence of the stabilization energy of the charge‐transfer excited state is mainly attributable to the change in the electrostatic energy accompanying the lattice contraction.
DOI： 10.1063/1.456873
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Optical study of bis(propylenedithio)tetrathiafulvalenium(BPDT-TTF) salts（共著） 査読あり
K. Yakushi, H. Tajima, T. Ida, M. Tamura, H. Hayashi, H. Kuroda, A. Kobayashi, R. Kato
Synthetic Metals 24 ( 4 ) 301 - 309 1988年06月
記述言語：英語 掲載種別：研究論文（学術雑誌）
Polarized reflectance spectra of (BPDT-TTF)3(PF6)2 and (BPDT-TTF)2I3 were measured at room temperature over the spectral region from 720 cm−1 to 25 000 cm−1. Both of these salts exhibited one-dimensional behaviour in contrast to the BEDT-TTF (bis-(ethylenedithio)tetrathiafulvalenium) salts. The transfer integrals and the on-site Coulomb energy of these materials were estimated by analysing the optical spectra, and the on-site Coulomb energy of (BPDT-TTF)3(PF6)2 was found to be significantly larger than that of TCNQ salts.
