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Research Output 1990 2019

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1990
4 Citations (Scopus)

Synthesis of ultra‐thin films of aromatic polymers at air/water interface

Ueda, T., Yokoyama, S., Watanabe, M., Sanui, K. & Ogat, N., Nov 1990, In : Journal of Polymer Science Part A: Polymer Chemistry. 28, 12, p. 3221-3230 10 p.

Research output: Contribution to journalArticle

Aromatic polymers
Ultrathin films
Polymers
Water
Air
1993
13 Citations (Scopus)
group dynamics
Optical anisotropy
Photoisomerization
Azobenzene
Langmuir Blodgett films
25 Citations (Scopus)

Preparation and In-Plane Anisotropic Photobleaching Properties of Polyimide Langmuir-Blodgett Films Having a Photoresponsive p-Nitroazobenzene Pendant Group

Yokoyama, S., Kakimoto, M. A. & Imai, Y., Jan 1 1993, In : Langmuir. 9, 4, p. 1086-1091 6 p.

Research output: Contribution to journalArticle

Photobleaching
Langmuir Blodgett films
Langmuir-Blodgett films
polyimides
Polyimides
1994
3 Citations (Scopus)

Displacement current generation across single monolayers of polyamic acids having pendant groups at the air-water interface

Naruse, H., Iwamoto, M., Yokoyama, S., Kakimoto, M. A. & Imai, Y., Apr 15 1994, In : Thin Solid Films. 242, 1-2, p. 220-222 3 p.

Research output: Contribution to journalArticle

Monolayers
surface water
acids
Acids
Water
22 Citations (Scopus)

Further investigation of the preparation process of poly(p-phenylenevinylene) Langmuir-Blodgett films

Wu, A., Yokoyama, S., Watanabe, S., Kakimoto, M. A., Imai, Y., Araki, T. & Iriyama, K., May 15 1994, In : Thin Solid Films. 244, 1-2, p. 750-753 4 p.

Research output: Contribution to journalArticle

Langmuir Blodgett films
Langmuir-Blodgett films
Heat treatment
preparation
Sulfides
14 Citations (Scopus)

Imidization Process in a Dye-Labeled Poly(amic acid) Langmuir-Blodgett Film Studied by Optical Second-Harmonic Generation

Yamada, T., Yokoyama, S., Kajikawa, K., Ishikawa, K., Takezoe, H., Fukuda, A., Kakimoto, M. A. & Imai, Y., Apr 1 1994, In : Langmuir. 10, 4, p. 1160-1163 4 p.

Research output: Contribution to journalArticle

Langmuir Blodgett films
Langmuir-Blodgett films
Harmonic generation
harmonic generations
Coloring Agents
9 Citations (Scopus)

Novel Orientation of Azobenzene Pendant Group in Hybrid Monolayers Composed of Polyimide Langmuir‒Blodgett Film and Alkyl Polysiloxane Self-Assembled Monolayer

Yokoyama, S., Yamada, T., Kajikawa, K., Kakimoto, M. A., Imai, Y., Takezoe, H. & Fukuda, A., Dec 1 1994, In : Langmuir. 10, 12, p. 4599-4605 7 p.

Research output: Contribution to journalArticle

Siloxanes
polysiloxanes
Azobenzene
Self assembled monolayers
polyimides
12 Citations (Scopus)

Observation of phase‐separated polymeric LB films using scanning probe microscopy

Yuba, T., Yokoyama, S., Kakimoto, MA. A. & Imai, Y., Jan 1 1994, In : Advanced Materials. 6, 11, p. 888-889 2 p.

Research output: Contribution to journalArticle

Scanning probe microscopy
Polymer films
Polyimides
Phase separation
Microscopic examination
19 Citations (Scopus)

Photochemically Inducible and Erasable Dichroism by Molecular Reorientation of an Azobenzene Pendant Unit in a Polyimide Langmuir‒Blodgett Film

Yokoyama, S., Kakimoto, M. A. & Imai, Y., Dec 1 1994, In : Langmuir. 10, 12, p. 4594-4598 5 p.

Research output: Contribution to journalArticle

Azobenzene
Dichroism
polyimides
Polyimides
dichroism
5 Citations (Scopus)

Photochemical memory system in polyimide Langmuir-Blodgett film with azobenzene pendant group

Yokoyama, S., Kakimoto, M. A. & Imai, Y., Apr 15 1994, In : Thin Solid Films. 242, 1-2, p. 183-186 4 p.

Research output: Contribution to journalArticle

Photoisomerization
Azobenzene
Langmuir Blodgett films
Langmuir-Blodgett films
polyimides
1995
43 Citations (Scopus)

Azimuthal Photoregulation of a Liquid Crystal with an Azobenzene-Modified Polyimide Langmuir-Blodgett Monolayer

Akiyama, H., Kudo, K., Ichimura, K., Yokoyama, S., Kakimoto, M. A. & Imai, Y., Mar 1 1995, In : Langmuir. 11, 3, p. 1033-1037 5 p.

Research output: Contribution to journalArticle

Liquid Crystals
Azobenzene
polyimides
Polyimides
Liquid crystals
3 Citations (Scopus)

The structure of PMDA-PDA polyimide monolayers adsorbed on gold surfaces

Keil, M., Paggel, J. J., Schedel-Niedrig, T., Yokoyama, S., Sotobayashi, H. & Bradshaw, A. M., Jan 1 1995, In : Applied Surface Science. 90, 3, p. 377-381 5 p.

Research output: Contribution to journalArticle

Personal digital assistants
Polyimides
Gold
Monolayers
Scanning tunneling microscopy
1996
17 Citations (Scopus)

Absolute orientation of pendant chromophores attached to the polymer backbone in monolayers at interfaces studied by phase measurement of second-harmonic generation

Kajikawa, K., Yamada, T., Yokoyama, S., Okada, S., Matsuda, H., Nakanishi, H., Kakimoto, M. A., Imai, Y., Takezoe, H. & Fukuda, A., Jan 24 1996, In : Langmuir. 12, 2, p. 580-583 4 p.

Research output: Contribution to journalArticle

Phase measurement
Chromophores
Harmonic generation
chromophores
Monolayers

Morphology study of polyamic acid alkyl amine salts and polyimide Langmuir-Blodgett films by atomic force microscopy

Kakimoto, M. A., Yokoyama, S. & Imai, Y., Aug 1996, In : Unknown Journal. 37, 2, p. 565-566 2 p.

Research output: Contribution to journalArticle

atomic force microscopy
Langmuir Blodgett films
Polyimides
Amines
Atomic force microscopy
2 Citations (Scopus)

STM studies of polyimide monolayers on gold{111} surfaces

Yokoyama, S., Keil, M., Sotobayashi, H., Bradshaw, A. M., Kakimoto, M., Imai, Y. & Lamont, C. L. A., Dec 1 1996, In : Zeitschrift fur Physikalische Chemie. 196, 1, p. 43-54 12 p.

Research output: Contribution to journalArticle

polyimides
Polyimides
Gold
Monolayers
Polymers
7 Citations (Scopus)

Surface observation of Langmuir-Blodgett films of polyamic acid alkylamine salts and polyimide by atomic force microscopy and friction force microscopy

Yokoyama, S., Kakimoto, M. & Imai, Y., Aug 15 1996, In : Synthetic Metals. 81, 2-3, p. 265-270 6 p.

Research output: Contribution to journalArticle

Langmuir Blodgett films
Langmuir-Blodgett films
polyimides
Polyimides
Atomic force microscopy
8 Citations (Scopus)

Surface structure and orientation of polyamic acid alkylamine salt Langmuir-Blodgett films having an azobenzene pendant unit

Yokoyama, S., Kakimoto, M. A., Imai, Y., Yamada, T., Kajikawa, K., Takezoe, H. & Fukuda, A., Jan 1 1996, In : Thin Solid Films. 273, 1-2, p. 254-257 4 p.

Research output: Contribution to journalArticle

Azobenzene
Langmuir Blodgett films
Langmuir-Blodgett films
Surface structure
Salts
1997
11 Citations (Scopus)
Langmuir Blodgett films
Langmuir-Blodgett films
Macromolecules
macromolecules
Dendrimers
43 Citations (Scopus)

Preparation and assembled structure of dipolar dendrons based electron donor/acceptor azobenzene branching

Yokoyama, S., Nakahama, T., Otomo, A. & Mashiko, S., Jan 1 1997, In : Chemistry Letters. 11, p. 1137-1138 2 p.

Research output: Contribution to journalArticle

Dendrimers
Fatty Acids
Electrons
azobenzene
2 Citations (Scopus)

The preparation, orientation and electronic structure of poly(p-phenylenevinylene) (PPV) monolayers on silicon surfaces

Keil, M., Rajagopal, A., Yokoyama, S., Sotobayashi, H., Bradshaw, A. M., Kakimoto, M. A. & Imai, Y., Dec 1 1997, In : Zeitschrift fur Physikalische Chemie. 202, 1-2, p. 87-102 16 p.

Research output: Contribution to journalArticle

Silicon
Electronic structure
Monolayers
Polymers
X ray absorption spectroscopy
1998
25 Citations (Scopus)

Second harmonic generation of dipolar dendrons in the assembled thin films

Yokoyama, S., Nakahama, T., Otomo, A. & Mashiko, S., Jan 1 1998, In : Thin Solid Films. 331, 1-2, p. 248-253 6 p.

Research output: Contribution to journalArticle

Dendrimers
Harmonic generation
harmonic generations
Thin films
thin films
2000
15 Citations (Scopus)
Hamiltonians
examination
Vibrational spectra
Angular momentum
harmonics
4 Citations (Scopus)

Computational and experimental studies of azobenzene dendrons for non-linear optical applications

Yokoyama, S., Mashiko, S., Yamaguchi, Y. & Yokomichi, Y., Aug 1 2000, In : Polymers for Advanced Technologies. 11, 8-12, p. 692-697 6 p.

Research output: Contribution to journalArticle

Dendrimers
Azobenzene
Chromophores
Molecular dynamics
Harmonic generation
13 Citations (Scopus)

Current-voltage characteristics with a step structure of metal/polyirnide/rhodamine-dendrirner/polyimide/ metal junction

Noguchü, Y., Majima, Y., Iwamoto, M., Kubota, T., Yokoyama, S., Nakahama, T. & Mashiko, S., Jan 1 2000, In : IEICE Transactions on Electronics. E83-C, 7, p. 1076-1080 5 p.

Research output: Contribution to journalArticle

Rhodamines
Current voltage characteristics
Polyimides
Metals
Coulomb blockade
159 Citations (Scopus)

Intermolecular coupling enhancement of the molecular hyperpolarizability in multichromophoric dipolar dendrons

Yokoyama, S., Nakahama, T., Otomo, A. & Mashiko, S., Apr 5 2000, In : Journal of the American Chemical Society. 122, 13, p. 3174-3181 8 p.

Research output: Contribution to journalArticle

Dendrimers
Azobenzene
Chromophores
Macromolecules
Optical Rotation
1 Citation (Scopus)

Molecular assembled structure and nonlinar optical property of azobenzene dendrimers

Yokoyama, S. & Mashiko, S., Jan 1 2000, In : KOBUNSHI RONBUNSHU. 57, 10, p. 637-645 9 p.

Research output: Contribution to journalArticle

Dendrimers
Azobenzene
optical property
energetics
Optical properties
4 Citations (Scopus)

Molecular design of novel azobenzene dendrimers

Yamaguchi, Y., Yokomichi, Y., Yokoyama, S. & Mashiko, S., Aug 1 2000, In : Polymers for Advanced Technologies. 11, 8-12, p. 674-684 11 p.

Research output: Contribution to journalArticle

Dendrimers
Azobenzene
Chloroform
Chlorine compounds
Molecular dynamics
51 Citations (Scopus)

Supernarrowing mirrorless laser emission in dendrimer-doped polymer waveguides

Otomo, A., Yokoyama, S., Nakahama, T. & Mashiko, S., Dec 11 2000, In : Applied Physics Letters. 77, 24, p. 3881-3883 3 p.

Research output: Contribution to journalArticle

dendrimers
waveguides
waveguide lasers
polymers
rhodamine
2001
10 Citations (Scopus)

Estimation of organic molecular film structures using surface-plasmon resonance spectroscopy

Zhou, M., Otomo, A., Yokoyama, S. & Mashiko, S., Aug 1 2001, In : Thin Solid Films. 393, 1-2, p. 114-118 5 p.

Research output: Contribution to journalArticle

Surface plasmon resonance
surface plasmon resonance
Spectroscopy
Substrates
spectroscopy
37 Citations (Scopus)
Dendrimers
Azobenzene
dendrimers
Dimers
dimers
10 Citations (Scopus)

Land use classification with textural analysis and the aggregation technique using multi-temporal JERS-1 L-band SAR images

Kurosu, T., Yokoyama, S., Fujita, M. & Chiba, K., Jan 1 2001, In : International Journal of Remote Sensing. 22, 4, p. 595-613 19 p.

Research output: Contribution to journalArticle

synthetic aperture radar
texture
analysis
JERS
land use classification

Laser applications of dendrimers

Mashiko, S., Yokoyama, S., Nakahama, T. & Otomo, A., Dec 1 2001, In : Shinku/Journal of the Vacuum Society of Japan. 44, 11, p. 963-968 6 p.

Research output: Contribution to journalArticle

Dendrimers
Laser applications
laser applications
dendrimers
Superradiance
126 Citations (Scopus)

Nonplanar adsorption and orientational ordering of porphyrin molecules on Au(111)

Yokoyama, T., Yokoyama, S., Kamikado, T. & Mashiko, S., Aug 22 2001, In : Journal of Chemical Physics. 115, 8, p. 3814-3818 5 p.

Research output: Contribution to journalArticle

Porphyrins
porphyrins
Adsorption
Molecules
adsorption
9 Citations (Scopus)

Photoisomerization of azobenzene dendrimer monolayer investigated by Maxwell displacement current technique

Shimura, D., Manaka, T., Nakamoto, M., Zhao, W., Majima, Y., Iwamoto, M., Yokoyama, S., Kubota, T. & Mashiko, S., Dec 1 2001, In : Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers. 40, 12, p. 7085-7090 6 p.

Research output: Contribution to journalArticle

Photoisomerization
Azobenzene
Dendrimers
dendrimers
Isomerization
24 Citations (Scopus)

Photon emission induced by tunneling electrons from a Cu(1 0 0) surface covered with porphyrin molecules

Fujita, D., Ohgi, T., Deng, W. L., Ishige, K., Okamoto, T., Yokoyama, S., Kamikado, T. & Mashiko, S., Nov 1 2001, In : Surface Science. 493, 1-3, p. 702-707 6 p.

Research output: Contribution to journalArticle

Electron tunneling
Porphyrins
electron tunneling
porphyrins
Photons
1 Citation (Scopus)

Remarkable optical properties of dendrimers for laser applications

Otomo, A., Otomo, S., Yokoyama, S., Nakahama, T. & Mashiko, S., Dec 1 2001, In : Proceedings of SPIE - The International Society for Optical Engineering. 4461, p. 180-187 8 p.

Research output: Contribution to journalArticle

Dendrimers
Laser applications
laser applications
dendrimers
Optical Properties
723 Citations (Scopus)

Selective assembly on a surface of supramolecular aggregates with controlled size and shape

Yokoyama, T., Yokoyama, S., Kamikado, T., Okuno, Y. & Mashiko, S., Oct 11 2001, In : Nature. 413, 6856, p. 619-621 3 p.

Research output: Contribution to journalArticle

Porphyrins
Scanning Tunnelling Microscopy
Gold
Equipment and Supplies
Temperature
16 Citations (Scopus)

Theoretical predictions of first-order hyperpolarizabilities of azobenzene dendrimers

Yamaguchi, Y., Yokomichi, Y., Yokoyama, S. & Mashiko, S., Jul 9 2001, In : Journal of Molecular Structure: THEOCHEM. 545, 1-3, p. 187-196 10 p.

Research output: Contribution to journalArticle

Dendrimers
dendrimers
Langmuir Blodgett films
Molecular Dynamics Simulation
Langmuir-Blodgett films
13 Citations (Scopus)

Time-dependent density functional calculations of the Q-like bands of phenylene-linked free-base and zinc porphyrin dimers

Yamaguchi, Y., Yokomichi, Y., Yokoyama, S. & Mashiko, S., Aug 15 2001, In : International Journal of Quantum Chemistry. 84, 3, p. 338-347 10 p.

Research output: Contribution to journalArticle

porphyrins
Dimers
Density functional theory
zinc
dimers
2002
59 Citations (Scopus)

Laser emission from high-gain media of dye-doped dendrimer

Yokoyama, S., Otomo, A. & Mashiko, S., Jan 7 2002, In : Applied Physics Letters. 80, 1, p. 7-9 3 p.

Research output: Contribution to journalArticle

dendrimers
high gain
dye lasers
dyes
lasing
19 Citations (Scopus)

Light emission from porphyrin molecules induced by a scanning tunneling microscope

Dong, Z. C., Kar, A., Zou, Z. Q., Ohgi, T., Dorozhkin, P., Fujita, D., Yokoyama, S., Terui, T., Yamada, T., Kamikado, T., Zhou, M., Mashiko, S. & Okamoto, T., Jul 1 2002, In : Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers. 41, 7 B, p. 4898-4902 5 p.

Research output: Contribution to journalArticle

Light emission
Porphyrins
porphyrins
light emission
Microscopes
38 Citations (Scopus)

Molecularly Resolved Dynamics for Two-Dimensional Nucleation of Supramolecular Assembly

Yanagi, H., Mukai, H., Ikuta, K., Shibutani, T., Kamikado, T., Yokoyama, S. & Mashiko, S., Jun 1 2002, In : Nano Letters. 2, 6, p. 601-604 4 p.

Research output: Contribution to journalArticle

Nucleation
assembly
nucleation
Molecules
nuclei
10 Citations (Scopus)

Novel rigid-rod 2,6-diphenylbenzo[1,2-d:4,5-d′]bisthiazole (DPBBT) derivatives for second-order nonlinear optical chromophores

Lee, S. H., Otomo, A., Nakahama, T., Yamada, T., Kamikado, T., Yokoyama, S. & Mashiko, S., Jan 1 2002, In : Journal of Materials Chemistry. 12, 8, p. 2187-2188 2 p.

Research output: Contribution to journalArticle

Chromophores
Transparency
Derivatives
20 Citations (Scopus)

Photochemical stability of encapsulated laser dyes in dendritic nanoboxes against singlet oxygen

Otomo, A., Otomo, S., Yokoyama, S. & Mashiko, S., Jun 1 2002, In : Optics Letters. 27, 11, p. 891-893 3 p.

Research output: Contribution to journalArticle

dye lasers
oxygen
dyes
bleaching
attachment
25 Citations (Scopus)

STM-induced photon emission from self-assembled porphyrin molecules on a Cu(100) surface

Deng, W., Fujita, D., Ohgi, T., Yokoyama, S., Kamikado, K. & Mashiko, S., Sep 8 2002, In : Journal of Chemical Physics. 117, 10, p. 4995-5000 6 p.

Research output: Contribution to journalArticle

Porphyrins
Scanning tunneling microscopy
porphyrins
scanning tunneling microscopy
Photons
35 Citations (Scopus)
Dimers
Density functional theory
Zinc
zinc
Monomers
4 Citations (Scopus)

Superfluorescence action from rhodamine-cored dendrimer

Yokoyama, S., Nakahama, T., Otomo, A. & Mashiko, S., Feb 18 2002, In : Colloids and Surfaces A: Physicochemical and Engineering Aspects. 198-200, p. 433-438 6 p.

Research output: Contribution to journalArticle

Superradiance
Dendrimers
Rhodamines
dendrimers
rhodamine
25 Citations (Scopus)

Theoretical study of aryl-ring rotation in arylporphyrins

Okuno, Y., Kamikado, T., Yokoyama, S. & Mashiko, S., Oct 11 2002, In : Journal of Molecular Structure: THEOCHEM. 594, 1-2, p. 55-60 6 p.

Research output: Contribution to journalArticle

Energy barriers
Porphyrins
Potential energy
Theoretical Models
rings
46 Citations (Scopus)

Theoretical study of benzonitrile clusters in the gas phase and their adsorption onto a Au(111) surface

Okuno, Y., Yokoyama, T., Yokoyama, S., Kamikado, T. & Mashiko, S., Jun 19 2002, In : Journal of the American Chemical Society. 124, 24, p. 7218-7225 8 p.

Research output: Contribution to journalArticle

Adsorption
Porphyrins
Theoretical Models
Gases
Adsorbates
11 Citations (Scopus)

Theoretical study of solvent effects of first-order hyperpolarizabilities of nitro-azobenzene dendrimers

Yamaguchi, Y., Yokomichi, Y., Yokoyama, S. & Mashiko, S., Feb 14 2002, In : Journal of Molecular Structure: THEOCHEM. 578, 1-3, p. 35-45 11 p.

Research output: Contribution to journalArticle

Dendrimers
dendrimers
Theoretical Models
Molecular Dynamics Simulation
acetonitrile