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Research Output 1990 2019

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., Nov 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
8 Citations (Scopus)

Various orientations of pendant dye attached to polyamic Langmuir and Langmuir-Blodgett films studied by an optical second-harmonic generation interferometry technique

Tamada, T., Yokoyama, S., Kajikawa, K., Ishikawa, K., Takezoe, H., Fukuda, A., Kakimoto, M. A. & Imai, Y., Jan 1 1994, In : Thin Solid Films. 244, 1 -2 pt 3, p. 754-757 4 p.

Research output: Contribution to journalConference article

Langmuir Blodgett films
Langmuir-Blodgett films
Harmonic generation
Interferometry
harmonic generations
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., Nov 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
9 Citations (Scopus)

Preparation of chromophoric dipolar dendrons as second-order nonlinear optical material

Yokoyama, S. & Mashiko, S., Dec 1 1997, In : Materials Research Society Symposium - Proceedings. 488, p. 765-770 6 p.

Research output: Contribution to journalConference article

Dendrimers
Optical materials
optical materials
Harmonic generation
harmonic generations
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
2 Citations (Scopus)
Azobenzene
Dimers
optical activity
dimers
monomers
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
160 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
Dendrimers
Azobenzene
chromophores
Chromophores
augmentation
Dendrimers
Azobenzene
chromophores
augmentation
Chromophores
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

Single-mode random laser in weakly scattering dendrimer waveguides

Otomo, A., Yokoyama, S., Otomo, S., Nakahama, T. & Mashiko, S., 2000, Conference on Lasers and Electro-Optics Europe - Technical Digest. IEEE, p. 367 1 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Dendrimers
Laser modes
Waveguides
Scattering
Stimulated emission
28 Citations (Scopus)

STM induced photon emission from adsorbed porphyrin molecules on a Cu(100) surface in ultrahigh vacuum

Fujita, D., Ohgi, T., Deng, W. L., Nejo, H., Okamoto, T., Yokoyama, S., Kamikado, K. & Mashiko, S., May 20 2000, In : Surface Science. 454, 1, p. 1021-1025 5 p.

Research output: Contribution to journalConference article

Porphyrins
Ultrahigh vacuum
porphyrins
ultrahigh vacuum
Photons
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
13 Citations (Scopus)

Effect of the metal/organic interface phenomena on the current-voltage characteristics of organic single electron tunneling device

Kubota, T., Yokoyama, S., Nakahama, T., Mashiko, S., Noguchi, Y., Majima, Y. & Iwamoto, M., Aug 1 2001, In : Thin Solid Films. 393, 1-2, p. 379-382 4 p.

Research output: Contribution to journalConference article

Electron tunneling
Current voltage characteristics
electron tunneling
Metals
Electric potential

Electrical properties of organic single electron tunneling device

Kubota, T., Yokoyama, S., Nakahama, T., Mashiko, S., Noguchi, Y., Hashizume, K., Manaka, T. & Iwamoto, M., Dec 1 2001, p. 541-544. 4 p.

Research output: Contribution to conferencePaper

Electron tunneling
Electric properties
Rhodamines
Macromolecules
Tunnels
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
129 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 journalConference article

Dendrimers
Laser applications
laser applications
dendrimers
Optical Properties
724 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
18 Citations (Scopus)

Spatial photon confinement and super-radiation from dye cored dendrimer

Yokoyama, S., Otomo, A., Nakahama, T. & Mashiko, S., Aug 1 2001, In : Thin Solid Films. 393, 1-2, p. 124-128 5 p.

Research output: Contribution to journalConference article

Dendrimers
dendrimers
Chromophores
chromophores
Coloring Agents
6 Citations (Scopus)

Stimulated emission in dendrimer-doped polymer waveguides

Otomo, A., Otomo, S., Yokoyama, S. & Mashiko, S., Aug 1 2001, In : Thin Solid Films. 393, 1-2, p. 278-283 6 p.

Research output: Contribution to journalConference article

Dendrimers
Stimulated emission
dendrimers
stimulated emission
Polymers

Synthesis of new dendrimers based on 6,8-dinitroquinazoline and 3,5-dimercaptobenzyl blocks

Miki, H., Yokoyama, S. & Mashiko, S., Dec 1 2001, In : Materials Research Society Symposium - Proceedings. 660

Research output: Contribution to journalConference article

Dendrimers
dendrimers
synthesis
photoelectronics
electron orbitals
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