FUNAHASHI Masahiro

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Name
FUNAHASHI Masahiro
Affiliation
Kagawa University
Section
Faculty of Engineering
Job title
Associate Professor

Research Interests

 
 

Research Areas

 
 

Education

 
 
 - 
1994
Graduate School, Division of Chemistry, The University of Tokyo
 
 
 - 
1991
Faculty of Science, The University of Tokyo
 

Published Papers

 
Atsushi Seki, Masahiro Funahashi, Masahiro Funahashi
Organic Electronics: physics, materials, applications   62 311-319   Nov 2018
© 2018 Elsevier B.V. We have previously reported a chiral photovoltaic (CPV) effect in a ferroelectric chiral smectic C (SmC*) phase of π-conjugated liquid crystals. This CPV effect is caused by the internal electric field originated from spontane...
Unique Superparamagnetic-like Behavior Observed in Non-π-delocalized Nitroxide Diradical Compounds Showing Discotic Liquid Crystalline Phase
Y. Takemoto, E. Zaytseva, K. Suzuki, N. Yoshioka, Y. Takanishi, M. Funahashi, Y. Uchida, T. Akita, J. Park, D. G. Mazhukin, S.Shimono, H. Takahashi, J. Yamauchi, R. Tamura
Chemistry - A European Journal   24 accepcted   2018   [Refereed]
Kato Takashi, Yoshio Masafumi, Ichikawa Takahiro, Soberats Bartolome, Ohno Hiroyuki, Funahashi Masahiro
NATURE REVIEWS MATERIALS   2(4)    Apr 2017   [Refereed]
Ryutaro Yamaoka, Masahiro Funahashi
ChemistrySelect   2 11934-11941   Jan 2017   [Refereed]
© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Novel liquid-crystalline (LC) nickel phthalocyanine (Ni-Pc) complexes bearing eight oligosiloxane moieties such as disiloxane and trisiloxane were synthesized and their liquid-crystalline propert...
Masahiro Funahashi
Polymer Journal   49(1) 83-83   Jan 2017
© 2017 The Society of Polymer Science, Japan (SPSJ) All rights reserved.Unlike conventional liquid crystals bearing alkyl chains, perylene tetracarboxylic bisimide (PTCBI) derivatives bearing oligosiloxane moieties were synthesized. The oligosilox...
Atsushi Seki, Yusuke Funatsu, Masahiro Funahashi
Physical Chemistry Chemical Physics   19 16446-16455   Jan 2017
© the Owner Societies 2017. (S)- and (R)-forms of chiral π-conjugated ferroelectric liquid crystals were synthesized. The dielectric properties in the ferroelectric liquid-crystalline (FLC) phases were evaluated using the Sawyer-Tower method. Spon...
Masahiro Funahashi, Nozomi Takeuchi, Akinari Sonoda
RSC Advances   6(22) 18703-18710   Jan 2016   [Refereed]
© The Royal Society of Chemistry 2016. Mesomorphic and electron transport properties are compared for liquid-crystalline (LC) perylene tetracarboxylic bisimide (PTCBI) derivatives bearing linear disiloxane and trisiloxane chains, as well as bis(tr...
Kaede Takenami, Shinobu Uemura, Masahiro Funahashi
RSC Advances   6(7) 5474-5484   Jan 2016
© The Royal Society of Chemistry 2016. A perylene tetracarboxylic bisimide (PTCBI) derivative bearing four cyclotetrasiloxane rings that forms a columnar phase at room temperature despite the presence of the bulky cyclotetrasiloxane rings was prep...
Atsushi Seki, Masahiro Funahashi
Chemistry Letters   45(6) 618-618   Jan 2016
© 2016 The Chemical Society of Japan.Photovoltaic effects in ferroelectrics have attracted much attention due to their potential of generating a large open-circuit voltage. Recently, we focus on an anomalous photovoltaic effect in ferroelectric li...
Atsushi Seki, Masahiro Funahashi
Heterocycles   92(1) 30-30   Jan 2016
© 2016 The Japan Institute of Heterocyclic Chemistry. Heteroaromatic skeletons are important functional units for optic and electronic materials. For the construction of novel functional soft matter, the self-assembled system utilizing the heteroa...
Taichi Hamamoto, Masahiro Funahashi
Journal of Materials Chemistry C   3 6891-6900   Jul 2015   [Refereed]
© The Royal Society of Chemistry. A dimer bearing two phenylterthiophene parts linked by a chiral moiety with a minimized molecular volume has been synthesized. This chiral dimer exhibits a chiral nematic phase and its helical structure can be fix...
Funatsu Yusuke, Sonoda Akinari, Funahashi Masahiro
JOURNAL OF MATERIALS CHEMISTRY C   3(9) 1982-1993   Mar 2015   [Refereed]
© 2015 The Royal Society of Chemistry. Ferroelectric liquid-crystalline phenylterthiophene derivatives bearing a decenyl group, disiloxane chain, and cyclotetrasiloxane ring were synthesized. These compounds exhibited a chiral smectic C (SmC∗) pha...
Masahiro Funahashi, Takashi Kato
Liquid Crystals   42(5/6) 909-917   Jan 2015   [Refereed]
© 2015 Taylor & Francis. It is fundamentally important to study the relationships between structures and properties of liquid crystals. Professor G.W. Gray developed new rod-like nematic liquid crystals, 4-alkyl- and 4-alkoxy-4ʹ-cyanobiphenyls, wh...
Mizuho Kondo, Yukihiro Inoue, Yuki Koeduka, Masahiro Funahashi, Akira Heya, Naoto Matsuo, Nobuhiro Kawatsuki
Chemistry Letters   44(7) 1010-1012   Jan 2015
© 2015 The Chemical Society of Japan. Two types of phenylenevinylene terthiophene with and without cyano side substitution were synthesized to investigate the effect of the molecular structure on optoelectronic properties. The oligothiophene with ...
M. Funahashi
Journal of Materials Chemistry C   2 7451-7459   Sep 2014
In contrast to solid-state organic semiconductors, superstructures can be constructed in liquid-crystalline (LC) phases, using chirality, hybridization with nanofibers, and nanosegregation. Chiral LC molecules form LC phases with helical structure...
Masahiro Funahashi, Akinari Sonoda
Physical Chemistry Chemical Physics   16(17) 7754-7763   May 2014   [Refereed]
Electron transport characteristics in nanosegregated columnar phases of perylene tetracarboxylic bisimide (PTCBI) derivatives bearing oligosiloxane chains are studied over wide temperature ranges using a time-of-flight (TOF) method. In the ordered...
Masato Mitani, Shogo Yamane, Masafumi Yoshio, Masahiro Funahashi, Masahiro Funahashi, Takashi Kato
Molecular Crystals and Liquid Crystals   594 112-121   May 2014
Copyright © Taylor & Francis Group, LLC. 5,5′-Bis(2-phenylethynyl)-2,2′-bithiophene derivative 1 containing dendritic moieties linked through amide groups was synthesized. Compound 1 exhibits a rectangular columnar phase on slow cooling from the i...
Masahiro Funahashi, Yusuke Funatsu, Kaede Takenami, Kunihiro Seike, Akinari Sonoda
21st International Display Workshops 2014, IDW 2014   1 56-59   Jan 2014
© 2014 ITE and SID. In contrast to conventional liquid crystalline semiconductors bearing linear alkyl chains, we have synthesized π-conjugated liquid crystals bearing cyclotetrasiloxane rings. Their thin films produced by a spin-coating method ca...
Masahiro Funahashi
Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry   72(9) 1006-1017   Jan 2014   [Refereed]
Liquid-crystalline semiconductors exhibit good carrier transport properties as well as solution-processability. The applications to field-effect transistors, light-emitting diodes, and solar cells have been studied. Liquid-crystalline perylene tet...
Yuna Kim, Masahiro Funahashi, Nobuyuki Tamaoki
RSC Advances   4(105) 60511-60518   Jan 2014   [Refereed]
© The Royal Society of Chemistry. We synthesized novel liquid crystalline semiconductors bearing an extended π-conjugated mesogen based on thieno[3,2-b]thiophene, which exhibit high solubility and low phase transition temperature. In particular, l...
Masahiro Funahashi, Mika Yamaoka, Kaede Takenami, Akinari Sonoda
Journal of Materials Chemistry C   1(47) 7872-7878   Dec 2013
Liquid-crystalline perylene tetracarboxylic bisimide derivatives bearing heptamethylcyclotetrasiloxane moieties have been synthesized. Compound 2 bearing four heptamethylcyclotetrasiloxane moieties exhibits a rectangular columnar phase at room tem...
Masahiro Funahashi, Akinari Sonoda
Dalton Transactions   42(45) 15987-15994   Dec 2013   [Refereed]
A liquid-crystalline (LC) perylene tetracarboxylic bisimide (PTCBI) derivative bearing a triethylene oxide chain as well as two pentamethyldisiloxane chains was synthesized. This compound exhibits an ordered lamellar phase at room temperature, and...
Masahiro Funahashi, Tomohiko Ishii, Akinari Sonoda
ChemPhysChem   14(12) 2750-2758   Aug 2013
A liquid-crystalline (LC) phenylterthiophene derivative, which exhibited an ordered smectic phase at room temperature, was purified by vacuum sublimation under a flow of nitrogen. During the sublimation process, thin plates with sizes of 1 mm grew...
Masahiro Funahashi, Yusuke Funatsu, Tomohiko Ishii, Akinari Sonoda
Proceedings of the International Display Workshops   1 40-43   Jan 2013
© 2013 ITE and SID. The carrier mobilities of liquid crystalline semiconductors exceed 0.1 cm 2 V 1 s -1 and they are comparable to those of molecular crystals. In this study, the hole transport characteristic in the ordered smectic phase of a 2-p...
Masahiro Funahashi, Akinari Sonoda
Journal of Materials Chemistry   22(48) 25190-25197   Dec 2012
A liquid-crystalline (LC) semiconductor based on perylene tetracarboxylic bisimide (PTCBI) bearing four 1,1,1,3,3-pentamethyldisiloxane chains was synthesized. This LC PTCBI derivative exhibits ordered columnar phases and the low temperature colum...
Masahiro Funahashi
Proceedings of SPIE - The International Society for Optical Engineering   8475 84750E   Dec 2012   [Refereed]
Conventional liquid-crystalline (LC) semiconductors have been molecules consisting of a π-conjugated moiety and alkyl chains. For example, phenylterthiophene derivatives bearing alkyl chains exhibit ordered smectic phase at room temperature and ar...
M. Funahashi
Proceedings of the International Display Workshops   1 17-20   Dec 2012
Conventional liquid-crystalline (LC) semiconductors have been molecules consisting of a π-conjugated moiety and alkyl chains. In this paper, we report a molecular design of LC electronic materials based on nanosegregation. Electrochromic LC molecu...
Masahiro Funahashi, Akinari Sonoda
Organic Electronics: physics, materials, applications   13(9) 1633-1640   Sep 2012   [Refereed]
Liquid-crystalline perylene tetracarboxylic acid bisimide derivatives 1 and 2 bearing 1,1,1,2,2,3,3-heptamethyltrisiloxane chains at the end of alkyl side-chains have been synthesized. Compound 1 having four trisiloxane chains exhibits a hexagonal...
Masahiro Funahashi, Nozomi Takeuchi, Naoyuki Tomita, Tomohiko Ishii, Akinari Sonoda
Proceedings of the International Display Workshops   1 553-556   Dec 2011
In this study, we designed and synthesized n-type perylene tetracarboxylic bisimide (PTCBI) and p-type phthalocyanine derivatives bearing oligosiloxane side chains. These compounds exhibit columnar phases at room temperature. Moreover, because of ...
Masahiro Funahashi, Fapei Zhang, Nobuyuki Tamaoki
IEICE Transactions on Electronics   E94-C(11) 1720-1726   Nov 2011   [Refereed]
Thin-film transistors based on Liquid-crystalline phenylterthiophenes, 3-TTPPh-5 and 3-TTPPhF4-6 are fabricated with a spincoating method. The devices exhibit p-type operation with the mobility on the order of 10 -2 cm 2V -1s -1. The field-effect ...
Nuita Midori, Sakuda Junji, Hirai Yuki, Funahashi Masahiro, Kato Takashi
CHEMISTRY LETTERS   40(4) 412-413   Apr 2011   [Refereed]
Aya Matsui, Masahiro Funahashi, Toru Tsuji, Takashi Kato
Chemistry - A European Journal   16(45) 13465-13472   Dec 2010
Side-chain liquid-crystalline siloxane polymers bearing terthiophene moieties as mesogenic pendant groups have been synthesized. An alkenylterthiophene derivative was treated with poly(hydrogenmethylsiloxane) and poly(dimethylsiloxane-co-hydrogenm...
Masahiro Funahashi, Fapei Zhang, Nobuyuki Tamaoki
IDW'10 - Proceedings of the 17th International Display Workshops   2 1705-1708   Dec 2010
Thin-film transistors based on Liquid-crystalline phenylterthiophene, 3-TTP-Ph-5 were fabricated with a solution-shared deposition method. The transistors on Si/SiO 2 substrates exhibit the field-effect mobility of the hole reached 8×10 -2 cm 2V -...
Sanami Yazaki, Masahiro Funahashi, Junko Kagimoto, Hiroyuki Ohno, Takashi Kato
Journal of the American Chemical Society   132(22) 7702-7708   Jun 2010
New molecular materials combining ionic and electronic functions have been prepared by using liquid crystals consisting of terthiophene-based mesogens and terminal imidazolium groups. These liquid crystals show thermotropic smectic A phases. Nanos...
Fapei Zhang, Masahiro Funahashi, Nobuyuki Tamaoki
Organic Electronics: physics, materials, applications   11(3) 363-368   Mar 2010   [Refereed]
We have fabricated the flexible field-effect transistors based on the liquid crystalline phenylterthiophene derivative via a solution process. A dielectric layer of polyvinyl alcohol (PVA) are deposited on a polyimide sheet substrate by a spin-coa...
舟橋 正浩, Yoshiko Shoji, Takima Yasuda, Takashi Kato
J. Mater. Chem.   20(1) 173-179-179   Jan 2010   [Refereed]
Aligned self-assembled fibers have been obtained for a phenylbithiophene derivative with a laterally fluorinated phenylene group by the application of electric fields. These fibrous aggregates exhibit photoconductive properties due to the stacking...
Masahiro Funahashi
Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers   63(10) 1374-1375   Dec 2009   [Refereed]
Masahiro Funahashi
Polymer Journal   41(6) 459-469   Aug 2009   [Refereed]
Carrier transport in liquid-crystal phases, design of liquid-crystalline semiconductors with high carrier mobilities, and their application to field-effect transistors are reviewed. High carrier mobility has been observed in the smectic phases of ...
Makoto Yoneya, Makoto Yoneya, Masahiro Funahashi, Hiroshi Yokoyama, Hiroshi Yokoyama
Proceedings of SPIE - The International Society for Optical Engineering   7232 1-72320   Apr 2009   [Refereed]
In this study, the structure and dynamics of a liquid crystalline semiconductor dioctylterthiophene system, 8-TTP-8, were examined by molecular dynamics simulations. We especially focus on the melting transition from the crystal to the liquid crys...
Takuma Yasuda, Hirotaka Ooi, Jun Morita, Yusuke Akama, Kiyoshi Minoura, Masahiro Funahashi, Takeshi Shimomura, Takashi Kato
Advanced Functional Materials   19(3) 411-419   Feb 2009   [Refereed]
A series of liquid-crystalline (LC) π-conjugated oligothiophenes bearing three or two alkoxy chains at their extremities has been designed and synthesized. These polycatenar oligothiophenes form various LC nanostructures including smectic, columna...
Fapei Zhang, Masahiro Funahashi, Nobuyuki Tamaoki
Organic Electronics: physics, materials, applications   10(1) 73-84   Feb 2009   [Refereed]
The authors fabricated thin films by solution processes using liquid-crystalline (LC) semiconductors, 5-alkyl-5''-(4-hexyltetrafluorophenyl)-2,2':5',2''-terthiophene (2-5). Films of 5-propyl-5''-(4-hexyltetrafluorophenyl)-2,2':5',2''-terthiophene ...
Liquid Crystalline Semiconductors and Their Application to Thin-Film Transistors
舟橋 正浩
58(2) 60-60   Feb 2009   [Refereed]
Fapei Zhang, Masahiro Funahashi, Nobuyuki Tamaoki
IDW '08 - Proceedings of the 15th International Display Workshops   2 1495-1498   Dec 2008
Thin-film transistors based on Liquid crystalline oligothiophene derivatives were fabricated. The transistors with the high performance were produced by the simple solution process. When the surface of the gate dielectrics were treated with octatr...
Sanami Yazaki, Masahiro Funahashi, Takashi Kato
Journal of the American Chemical Society   130(40) 13206-13207   Oct 2008   [Refereed]
A new electrochromic molecule comprised of π-conjugated and ionic moieties has been designed and synthesized. It forms a nanosegregated smectic phase in which ion-conductive layers of imidazolium salts are located between hole transport layers of ...
Hiroshi Noguchi, Tsuyoshi Michinobu, Tsuyoshi Michinobu, Nozomu Fujii, Masahiro Funahashi, Masahiro Funahashi, Masatoshi Tokita, Junji Watanabe, Kiyotaka Shigehara, Kiyotaka Shigehara
Journal of Polymer Science, Part A: Polymer Chemistry   46(15) 5101-5114   Aug 2008   [Refereed]
Cyanotolane or fluorotolane mesogens were for the first time introduced into the fumarate monomer under basic conditions. All fumarate monomers undergo radical polymerization in benzene in the presence of dimethyl 2,2′-azobis(isobutyrate) as an in...
Takashi Nakanishi, Takashi Nakanishi, Takashi Nakanishi, Yanfei Shen, Jiaobing Wang, Shiki Yagai, Shiki Yagai, Masahiro Funahashi, Takashi Kato, Paulo Fernandes, Helmuth Möhwald, Dirk G. Kurth, Dirk G. Kurth
Journal of the American Chemical Society   130(29) 9236-9237   Jul 2008   [Refereed]
Fullerenes, C60, modified with long alkyl chains form long-range ordered lamellar mesophases permitting a high C60 content. The mesomorphic fullerenes feature reversible electrochemistry and a comparably high electron carrier mobility making them ...
Masahiro Funahashi, Fapei Zhang, Nobuyuki Tamaoki, Jun Ichi Hanna
ChemPhysChem   9(10) 1465-1473   Jul 2008   [Refereed]
5-Hexyl-5″-hexynyl-2,2′:5′,2″-terthiophene exhibits the smectic E phase below 200°C and does not crystallize when it is cooled to -100°C. Between 200 and -100°C, non-dispersive transport is observed for holes and electrons with time-of-flight spec...
M. Funahashi, F. Zhang, F. Zhang, N. Tamaoki
IDW '07 - Proceedings of the 14th International Display Workshops   2 459-462   Dec 2007
2-Alkyl-5"-(p-alkylphenyl)terthiophene derivatives were synthesized and around room temperature, they exhibited highly ordered smectic phases in which fast electronic carrier transport is possible. This compound was applied to thin film transistor...
V. Ajay Mallia, Masahiro Funahashi, Nobuyuki Tamaoki
Journal of Physical Organic Chemistry   20(11) 878-883   Nov 2007   [Refereed]
4-Heptylazobenzene (HAB) has been covalently attached to cholesterol (Ch) by varying the methylene spacers and to cyanobiphenyl (CB) moiety with an octyl methylene linkage. Enhancement of short-range translational correlations in the chiral nemati...
Masahiro Funahashi, Harutoki Shimura, Masafumi Yoshio, Takashi Kato
Structure and Bonding   128 151-179   Aug 2007
Liquid-crystalline (LC) polymers that exhibit ionic or electronic conduction are described. Anisotropic and efficient transportation of electrons and ions is expected for these materials. The ordered LC nanostructures of LC polymers having ion- or...
Fapei Zhang, Masahiro Funahashi, Nobuyuki Tamaoki
Applied Physics Letters   91(6) 63515   Aug 2007
The authors have prepared liquid crystalline (LC) semiconducting thin films with smectic phases at room temperature from 5-propyl- 5″ -(4-pentylphenyl)- 2, 2′: 5′, 2″ -terthiophene (3-TTPPh-5) by spin-coating process. The films consist of large-si...
Takashi Kamei, Masabumi Kudo, Haruhisa Akiyama, Momoyo Wada, JuN'Ichi Nagasawa, Masahiro Funahashi, Nobuyuki Tamaoki, Taro Q P Uyeda
European Journal of Organic Chemistry   3053   Jul 2007
Takashi Kamei, Masabumi Kudo, Haruhisa Akiyama, Momoyo Wada, Jun'ichi Nagasawa, Masahiro Funahashi, Nobuyuki Tamaoki, Taro Q P Uyeda
European Journal of Organic Chemistry   2007(11) 1846-1853   Jun 2007   [Refereed]
We demonstrate significant visible-light photoresponsivity in a synthesized oligonucleotide containing a built-in pseudonucleotide possessing a 4-(dimethylarnino)azobenzene (4-DMAzo) side chain. In dry DMSO as solvent, two clearly distinguishable ...
Masahiro Funahashi, Nobuyuki Tamaoki
Chemistry of Materials   19(3) 608-617   Feb 2007   [Refereed]
We have synthesized three phenylquaterthiophene derivatives (liquid-crystalline semiconductors that exhibit a chiral nematic phase) and investigated their carrier transport characteristics in the chiral nematic phases with the time-of-flight techn...
Masahiro Funahashi, Fapei Zhang, Nobuyuki Tamaoki
Advanced Materials   19(3) 353-358   Feb 2007   [Refereed]
A solution-processable smectic liquid-crystalline semiconductor with fast ambipolar carrier transport for organic field-effect-transistors was synthesized. The homogeneous smectic thin films of liquid-crystalline semiconductors were fabricated by ...
Masahiro Funahashi, Masahiro Funahashi, Nobuyuki Tamaoki
Molecular Crystals and Liquid Crystals   475 123-135   Jan 2007   [Refereed]
We have synthesized 2-[5-(4-[(S)-2-methylbutoxy]phenyl)-3-methyl]-2'''- propyl-2:5'-2':5''-2'':5'''-quaterthiophene (10), a liquid crystalline semiconductor that exhibits a chiral nematic phase, and used the time-of-flight technique to determine i...
M. Funahashi, F. Zhang, N. Tamaoki
IDW '06 - Proceedings of the 13th International Display Workshops   1 19-22   Dec 2006
asymmetrically substituted oligothiophene derivatives were synthesized and around room temperature, they exhibited highly ordered smectic phases in which fast electronic carrier transport. In particular high electron mobility exceeding over 0.2 cm...
Masahiro Funahashi, Masahiro Funahashi
Molecular Crystals and Liquid Crystals   458 3-10   Nov 2006   [Refereed]
Liquid crystalline semiconductors have been recognized as one of promising materials potential for opto-electronics applications. However increase in carrier mobility as well as extension of mesomorphic temperature range is indispensable for pract...
Masabumi Takahashi, Kentaro Masui, Hiroki Sekiguchi, Nobuhiko Kobayashi, Atsunori Mori, Atsunori Mori, Masahiro Funahashi, Nobuyuki Tamaoki
Journal of the American Chemical Society   128(33) 10930-10933   Aug 2006   [Refereed]
Synthesis of oligothiophenes of well-defined structures that possess 2-8 thiophene units is performed with a new synthetic strategy involving C-H homocoupling of bromothiophenes and cross-coupling with organostannanes. Tolerance of the carbon-brom...
Tsuyoshi Michinobu, Tsuyoshi Michinobu, Takashi Nakanishi, Jonathan P. Hill, Masahiro Funahashi, Katsuhiko Ariga
Journal of the American Chemical Society   128(32) 10384-10385   Aug 2006   [Refereed]
Room temperature liquid C 60 derivatives bearing a 2,4,6-trialkyloxyphenyl branch show a dramatic decrease in viscosity with an increase in the length of the alkyl chains. This feature, when combined with electrochemical activities similar to thos...
Masahiro Funahashi, Nobuyuki Tamaoki
ChemPhysChem   7(6) 1193-1197   Jun 2006   [Refereed]
(Figure Presented) Carrier transport characteristics in the chiral nematic phase of 2-[5-(4-[(S)-2-methylbutoxy]phenyl)-3-methyl]-2′″-propyl-2: 5′-2′:5″-2″:5′″-quaterthiophene, a liquid-crystalline semiconductor (see picture), are determined with ...
Masahiro Funahashi, Masahiro Funahashi, Jun Ichi Hanna
Molecular Crystals and Liquid Crystals   436 1179-1189   Dec 2005   [Refereed]
Smectic semiconductors with high carrier mobility were designed and synthesized. The hole mobility of 3-TTP-yne-4 and 3-QTP-yne-3 at room temperature was 0.06cm2/Vs and 0.1cm2/Vs, respectively. They exhibit highly ordered smectic phases around roo...
Yuichiro Haramoto, Yuichiro Haramoto, Yuko Kawada, Atushi Mochizuki, Masato Nanasawa, Seiji Ujiie, Masahiro Funahashi, Kohki Hiroshima, Takamasa Kato
Liquid Crystals   32(7) 909-912   Jul 2005   [Refereed]
We report a new possibility for liquid crystalline organic semiconductors. These materials exhibit smectic liquid crystalline phases, in which the molecules assume a smectic molecular order by self-assembly. Because of the strong dispersion force ...
Masahiro Funahashi, Jun Ichi Hanna
Advanced Materials   17(5) 594-598   Mar 2005   [Refereed]
The thiophene-based smectic liquid crystals were examined for their high carrier mobility at ambient temperatures. Asymmetrically substituted terthiophene and quaterthiophene derivatives, were synthesized. The charge-carrier mobility was determine...
Naoki Yoshimoto, Masahiro Funahashi, Jun Ichi Hanna
Molecular Crystals and Liquid Crystals   409 493-504   Dec 2004   [Refereed]
We have fabricated a novel charge carrier transport material composed of a liquid crystalline molecule and a cross-linked polymer. This composite system exhibited high hole mobility comparable with that of the pure liquid crystalline material. The...
Masahiro Funahashi, Jun Ichi Hanna
Molecular Crystals and Liquid Crystals   410 529-540   Dec 2004   [Refereed]
We synthesized dialkylterthiophene derivatives ω-substituted with cyclohexylethyl moiety, which exhibit smectic mesophases at room temperature, and investigated their charge carrier transport properties. In particular, transpentylcyclohexylethyl-p...
Masahiro Funahashi, Jun Ichi Hanna
Chemical Physics Letters   397(4/6) 319-323   Oct 2004   [Refereed]
The impurity effect on the charge carrier transport in a smectic liquid crystal was investigated by time-of-flight experiments with a model system of a 2-phenylnaphthalene derivative of 2-(4′-octylpheny)-6-dodecyloxynaphthalene (8-PNP-O12) and a n...
Jun Ichi Hanna, Masahiro Funahashi
Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry   62(8) 799-810   Aug 2004   [Refereed]
In these ten years, two separate groups including the author's discovered the electronic conduction in liquid crystals, whose electrical conduction had been believed to be ionic for a long time. Since then, we have synthesized model compounds and ...
Akira Ohno, Akira Ohno, Kensuke Kurotaki, Akihide Haruyama, Masahiro Funahashi, Jun Ichi Hanna, Jun Ichi Hanna
Proceedings of SPIE - The International Society for Optical Engineering   4991 274-281   Nov 2003
We have investigated the hole transport in smectic mesophases by Monte Carlo simulation based on a two-dimensional hopping transport in Gaussian-distributed density of states and time-of-flight experiments. We found that their unique carrier trans...
Modeling of electronic charge transport in smectic liquid crystals
舟橋 正浩
4991 274-281   Aug 2003   [Refereed]
Enhanced light emission from self-organizing molecular semiconductors by using organic thin film transistors
舟橋 正浩
4800 229-237   Jun 2003   [Refereed]
Yasuo Toko, Masahiro Funahashi, Jun Ichi Hanna
Proceedings of SPIE - The International Society for Optical Engineering   4800 229-237   Dec 2002
Electro-optical characteristics were studied on the organic semiconductor materials exhibiting molecular alignment based on molecular self-organization in their liquid crystal phases. It was confirmed that these organic semiconductor materials exh...
Carrier transport properties in crosslinked polymer/liquid crystalline semiconductors
舟橋 正浩, 吉本 尚起, 半那 純一
Mat. Res. Soc. Symp. Proc.,   709 147-152   Sep 2002   [Refereed]
Yuichiro Haramoto, Taito Yamada, Masato Nanasawa, Masahiro Funahashi, Junichi Hanna, Seiji Ujiie
Liquid Crystals   29(8) 1109-1111   Aug 2002   [Refereed]
New conductive thermotropic liquid crystalline materials having a piperazine ring in the central core: 1-[4-(9-decenyloxy)phenyl]-4-alkylpiperazines (6) were synthesized. The mesomorphic behaviours of these compounds and their conductivity in the ...
Electro-optical characteristics of self-organizing molecular semiconductor aligned by polyimide film
舟橋 正浩
Mol. Cryst. Liq. Cryst.   367 1354 - 1361   Jul 2002   [Refereed]
Naoki Yoshimoto, Masahiro Funahashi, Jun Ichi Hanna
Materials Research Society Symposium - Proceedings   709 147-152   Jan 2002
A novel composite system containing of liquid crystalline semiconductor and crosslinked polymer exhibited high hole mobilities with comparison of that of pure liquid crystalline molecules. The carrier transport properties were influenced by the po...
Hiroki Maeda, Masahiro Funahashi, Jun Ichi Hanna
Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals   366 2111-376   Dec 2001
We have investigated the charge transport properties in smectic photoconductive liquid crystal of 2-phenylnaphthalene derivatives in focus on the electrical nature of the boundaries at the phase transition from liquid crystalline phase into the cr...
Takahiro Kamitani, Masahiro Funahashi, Jun Ichi Hanna
International Conference on Digital Printing Technologies   546-549   Dec 2001
The impurity effect on the carrier transport in a 2-phenylnaphthalene derivative of 6-(4'-octylphenyl)- 2-dodecyloxynaphthlene (8-PNP-O12), which is a liquid crystalline photoconductor and we call Self-organizing Molecular Semiconductors (SOMS), w...
Masahiro Funahashi, Jun Ichi Hanna
Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals   368 4071-4078   Dec 2001
We have studied the carrier transport properties of the two series of smectic mesophases, from SmA to SmE phases, and from SmC to SmG phases in 2-pahenynaphthalene and terthiophene derivatives by time of flight measurements. We examine the experim...
Probe of molecular ordering in photoconductive smectic mesophases by transient photocurrent measurement
舟橋 正浩
Mol. Cryst. Liq. Cryst.   368 303-310   Jul 2001   [Refereed]
Electrical properties of domain boundary in photoconductive smectic mesophases and their crystal phases
舟橋 正浩
Molecular Crystals and Liquid Crystals   366 2221-2228   Jun 2001   [Refereed]
Hiroki Maeda, Masahiro Funahashi, Jun Ichi Hanna
Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals   346 183-192   Dec 2000   [Refereed]
Smectic mesophases in the calamitic liquid crystalline materials such as 2-phenylnaphthalene derivatives exhibit fast ambipolar carrier transport, whose mobility is up to 10-2 cm2/Vs. For these mesophases, we have investigated the effect of defect...
Masahiro Funahashi, Jun Ichi Hanna
International Conference on Digital Printing Technologies   461-466   Dec 2000
The general features of electrical properties of a new class of organic photoconductors, i.e., photoconductive liquid crystals, to which we prefer "Self-organizing Molecular Semiconductors" as a conceptual name, are reviewed briefly. And in two se...
Hiroki Maeda, Masahiro Funahashi, Jun Ichi Hanna
Materials Research Society Symposium - Proceedings   598    Dec 2000
Calamitic liquid crystalline photoconductors such as 2-(4′-octylphenyl)-6-butyloxynaphthalene (8-PNP-O4) and 2-(4′-octylphenyl)-6-dodecyloxynaphthalene (8-PNP-O12) exhibit fast ambipolar carrier transport in all the smectic mesophases up to 1.0×10...
Masahiro Funahashi, Jun Ichi Hanna
Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry   58(9) 887-892   Sep 2000   [Refereed]
Recently, a new class of organic materials, i.e., self-organizing molecular semiconductors has been created. This materials exhibit self-organizing molecular alignment and excellent carrier transport properties compared with the conventional amorp...
舟橋 正浩
J. Soc.Photo. Sci. Tech. Japan   63(2) 69-77-77   Jun 2000   [Refereed]
Masahiro Funahashi, Jun Ichi Hanna
Applied Physics Letters   76(18) 2574-2576   May 2000   [Refereed]
Dialkylterthiphene derivatives exhibiting self-organization of molecular alignment were synthesized and their electrical properties were studied. It was found that these materials exhibited very fast electron transport in smectic mesophases as wel...
Hong Zhang, Masahiro Funahashi, Jun ichi Hanna
Proceedings of SPIE - The International Society for Optical Engineering   3939 126-134   Jan 2000
The spectral sensitization and photosensitization efficiency of a liquid crystalline photoconductor, 2-(4′-octylphenyl)-6-dodecyloxy-naphthalene (8-PNP-O12) with C70 were investigated by steady-state and transient photocurrent measurements in term...
Masahiro Funahashi, Jun Ichi Hanna
Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals   331 2369-2376   Dec 1999   [Refereed]
We have characterized carrier transport in mesophases of 2-phenyl-naphthalene derivatives by transient photocurrent measurements. In contrast to ionic conduction of isotropic and nematic (N) phase, electronic and ambipolar carrier transport was ob...
Hong Zhang, Hiroki Maeda, Masahiro Funahashi, Jun ich Hanna
Proceedings of SPIE - The International Society for Optical Engineering   3799 168-177   Dec 1999
The photo-hole generation process in the smectic phases of a liquid crystalline photoconductor, 2-(4′-octylpheny)-6-dodecyoxylnaphthalene (8-PNP-O12) was investigated by using steady-state and transient photocurrent measurements. It was revealed t...
Kyoko Kogo, Hiroki Maeda, Hiroaki Kato, Masahiro Funahashi, Jun Ichi Hanna
Applied Physics Letters   75(21) 3348-3350   Nov 1999   [Refereed]
An organic ferroelectric photoconductor, 2-[(S)-4-(6-methylheptyloxy)phenyl]-6-decylnaphthalene, was prepared and its photoconductive and ferroelectric behaviors were characterized by steady-state and transient electrical measurements. This materi...
Microsecond photo-response in liquid crystalline photoconductor doped with C70 under illumination of visible light
舟橋 正浩
75 2484 -2486   Aug 1999   [Refereed]
Photo-hole generation in smectic liquid crystalline photoconductor
舟橋 正浩
3799 168-177   Aug 1999   [Refereed]
Masahiro Funahashi, Jun Ichi Hanna
Applied Physics Letters   74(18) 2584-2586   May 1999
The spectral photosensitization of a liquid crystalline photoconductor (8-PNP-O12) was investigated by doping the photoconductor with C70. Results showed that the doping prompted the photoconductor's liquid crystal cells to exhibit a photoresponse...
Masahiro Funahashi, Jun Ichi Hanna
Japanese Journal of Applied Physics, Part 2: Letters   38(2A) 132-135   Feb 1999   [Refereed]
Photoconductive anisotropy of a liquid crystalline photoconductor, 2-(4′-octylphenyl)-6-dodecyloxynaphthalene (8-PNP-O12) exhibiting smectic B (SmB) and smectic A (SmA) phases, was studied by steady-state and transient photocurrent measurements fo...
Nobuharu Iwasawa, Masahiro Funahashi, Satoshi Hayakawa, Taketo Ikeno, Koichi Narasaka
Bulletin of the Chemical Society of Japan   72(1) 85-97   Jan 1999   [Refereed]
Bicyclic cyclopropanols having an olefinic side chain are oxidized-with manganese(III) tris(pyridine-2-carboxylate) to generate cyclic β-keto radicals with ring-expansion. These cyclize intramolecularly, affording bicyclic radical intermediates. T...
Microsecond photo-responce in liquid crystalline photoconductor doped with C70 under illumination of visible light
Applied Physics Letters   75 2484-2486   1999
Jun Ichi Hanna, Masahiro Funahashi
International Conference on Digital Printing Technologies   498-501   Dec 1998
Carrier transport properties of a calamitic liquid crystalline photoconductor (Calamitic LCPC), 2-pheny-naphthalene derivatives were investigated by steady state and transient photocurrenl measurements. These materials exhibited calamitic mesophas...
Kyoko Kogo, Tadashi Goda, Masahiro Funahashi, Jun Ichi Hanna
Applied Physics Letters   73(11) 1595-1597   Dec 1998   [Refereed]
Liquid crystal cells containing a homogeneously aligned calamitic liquid crystalline semiconductor, 2-(4-octylphenyl)-6-dodecyloxynaphthalene, doped with dyes such as 3-(2-benzothiazolyl)7-diethylaminocoumarin, emitted a visible light when a dc bi...

Misc

 
Carrier transport in liquid crystalline semiconductors
舟橋 正浩
Transworld Research Network, Recent Develop. of Appl. Phys.   6 839-857   Nov 2003

Research Grants & Projects

 
Electronic and photonic physics and material design of liquid crystalline semiconductors