研究者業績

辻岡 強

ツジオカ ツヨシ  (Tsuyoshi Tsujioka)

基本情報

所属
大阪教育大学 理数情報教育系 (名誉教授)
学位
理学修士(大阪市立大学)
博士(工学)(九州大学)

連絡先
tsujiokacc.osaka-kyoiku.ac.jp
研究者番号
30346225
ORCID ID
 https://orcid.org/0000-0002-6434-8052
J-GLOBAL ID
200901020048249654
researchmap会員ID
5000026374

外部リンク

経歴

 8

委員歴

 2

論文

 107
  • Megumi Dohi, Tsuyoshi Tsujioka
    Japanese Journal of Applied Physics 62(12) 121004-121004 2023年12月8日  査読有り最終著者
    Abstract Estimating the surface glass transition temperature (Tg) of materials is important for making organic devices by vacuum evaporation because the surface Tg affects the interface of layered devices and their performance. The enthalpy state of organic films is related to Tg. Bulk Tg is ordinarily measured by differential scanning calorimetry (DSC), although there is no established method for measuring the surface Tg. The Mg deposition property reflects the surface Tg; no Mg deposition denotes a low surface Tg. In this study, we investigated how annealing affects the bulk and surface Tg of N,N′-Bis-(1-naphthalenyl)-N,N′-bis-phenyl-(1,1′-biphenyl)-4,4′-diamine (NPB) using DSC and the Mg deposition properties. For bulk NPB, enthalpy relaxation occurred after annealing at a temperature below Tg. On the other hand, for vacuum-deposited NPB film, the enthalpy was in a relaxed state just after preparation, although the surface’s enthalpy recovered by annealing at same condition, as identified by the Mg deposition property.
  • Tsuyoshi Tsujioka, Keishi Yamabayashi, Kazuma Kotani
    Small 20 2306145 2023年10月  査読有り筆頭著者責任著者
  • Tsuyoshi Tsujioka
    Journal of Vacuum Science & Technology B 41 052209 2023年9月  査読有り筆頭著者最終著者責任著者
  • 辻岡 強
    表面と真空 66(7) 376-381 2023年7月  査読有り招待有り筆頭著者最終著者責任著者
  • Tsuyoshi Tsujioka, Hatsuka Kusaka
    Advanced Materials Interfaces 9(25) 2201096 2022年9月2日  査読有り筆頭著者責任著者
  • 辻岡強
    材料表面 7(3) 119-127 2022年8月25日  査読有り招待有り筆頭著者最終著者責任著者
  • Megumi Dohi, Tsuyoshi Tsujioka
    Applied Physics A 128 606 2022年6月23日  査読有り最終著者責任著者
  • Tsuyoshi Tsujioka, Hatsuka Kusaka, Arimi Shimotsu
    Journal of Vacuum Science & Technology A 39(4) 043202-1-043202-8 2021年5月12日  査読有り筆頭著者責任著者
  • Tsuyoshi Tsujioka, Akari Nishimura
    Applied Physics A 127 228 2021年3月5日  査読有り筆頭著者責任著者
  • Tsuyoshi Tsujioka, Yuki Nakanishi, Ryo Nishimura, Kingo Uchida
    Dyes and Pigments 186 109069-109069 2021年2月  査読有り筆頭著者責任著者
  • Tsuyoshi Tsujioka, Shoko Ishida
    Japanese Journal of Applied Physics 59 061001-1-061001-6 2020年5月12日  査読有り筆頭著者責任著者
  • Kingo Uchida, Ryo Nishimura, Hiroyuki Mayama, Tsuyoshi Tsujioka, Satoshi Yokojima, Shinichiro Nakamura
    Photosynergetic Responses in Molecules and Molecular Aggregates 405-425 2020年  査読有り
  • T. Tsujioka, S. Matsumoto, K. Yamamoto, M. Dohi, Y. Lin, S. Nakamura, S. Yokojima, K. Uchida
    Applied Surface Science 490 309-317 2019年6月11日  査読有り筆頭著者責任著者
  • T. Tsujioka, K. Hoshimoto
    Advanced Electronic Materials 5 1800491 2019年1月  査読有り筆頭著者責任著者
  • I. Takemoto, T. Tsujioka
    Japanese Journal of Applied Physics 57 121601-1-121601-5 2018年10月31日  査読有り最終著者責任著者
  • Tsuyoshi Tsujioka, Saki Matsumoto
    Journal of Materials Chemistry C 6 9786-9793 2018年  査読有り筆頭著者責任著者
  • Tsuyoshi Tsujioka, Masaki Okuda
    APPLIED SURFACE SCIENCE 426 169-176 2017年12月  査読有り筆頭著者責任著者
    Surfaces and interfaces play an important role in obtaining high-performance organic devices. An essential property of organic films is the surface glass transition temperature (surface-Tg) and many methods for characterizing surface-(Tg) have been studied. We propose a novel method for characterizing surface-Tg based on metal-vapor atom deposition and desorption. We monitored metal-vapor deposition and desorption on organic surfaces using double quartz crystal microbalances. Mg vapor is not deposited on organic surfaces with a low bulk-Tg such as a colorless photochromic diarylethene (DAE) film. This deposition phenomenon is caused by Mg-atom desorption from the surface based on active surface molecular motion. However, Mg deposition began after a certain time of continuous evaporation (deposition-threshold time). The threshold time elongated with increased substrate temperature and elongated dramatically at a substrate temperature several degrees below the bulk-Tg for DAE. The surface molec ular motion becomes active and the metal-atom desorption accelerates as the temperature neared the surface-Tg. Thus a temperature with a dramatic elongation of the threshold time indicates the surface-Tg. This method can be applied to a variety of organic films. (C) 2017 Elsevier B.V. All rights reserved.
  • Tsuyoshi Tsujioka, Riku Shirakawa, Saki Matsumoto, Ryo Nishimura, Kingo Uchida
    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A 35(2) 020603 2017年3月  査読有り筆頭著者責任著者
    Vacuum evaporation, which is widely used to obtain a metal-film coating on substrates and/or targets, results in a large loss of evaporation materials. The authors discovered a selective metalvapor deposition phenomenon in which metal-vapor atoms can be deposited selectively without a shadow mask. The core phenomenon of selective deposition is the desorption of metal-vapor atoms from organic surfaces with a low-glass transition temperature (low-Tg). The authors investigated metal-atom desorption from low-Tg polymer [polydimethylsiloxane (PDMS)] surfaces during vacuum deposition and found that greater than 2-lm-thick PDMS film enables high desorption efficiency. The authors proposed two vacuum deposition methods: metal-vapor transportation and metal-vapor integration. The former method attained reduced substrate surface temperatures during vacuum evaporation and the latter enabled extremely high deposition efficiency and three-dimensional deposition in a one-batch process. These new methods can greatly widen applications of vacuum deposition. (C) 2016 American Vacuum Society.
  • Tsuyoshi Tsujioka, Kazuki Yamamoto
    JAPANESE JOURNAL OF APPLIED PHYSICS 55(6) 061602 2016年6月  査読有り筆頭著者責任著者
    We propose a basic concept of all-electrically operable organic memory with a photochromic diarylethene (DAE) film based on a transistor structure, in which the DAE memory layer is recordable, erasable, and nondestructively readable by an electrical method. To realize such memory, we investigated each elementary process for recording, erasing, or nondestructive reading by current injection and electrostatic methods for the DAE layer. Both ring-opening and ring-closure isomerization reactions were confirmed for the injection of both carriers (electrons and holes). Hole injection induced ring-opening reaction only. These reaction modes can be utilized in the recording and erasing modes. Since no reactions for electron injection and current modulation based on photoisomerization were observed, electron current injection can be applied to nondestructive readout. (C) 2016 The Japan Society of Applied Physics
  • K. Yamamoto, T. Tsujioka
    Materials Letters 179 158-161 2016年5月  査読有り最終著者責任著者
  • Tsuyoshi Tsujioka
    CHEMICAL RECORD 16(1) 231-248 2016年2月  査読有り招待有り
    Selective metal-vapor deposition signifies that metal-vapor atoms are deposited on a hard organic surface, but not on a soft (low glass transition temperature, low T-g) surface. In this paper, we introduce the origin, extension, and applications of selective metal-vapor deposition. An amorphous photochromic diarylethene film shows light-controlled selective metal-vapor deposition, which is caused by a large T-g change based on photoisomerization, but various organic surfaces, including organic crystal and polymers, can be utilized for achieving selective metal-vapor deposition. Various applications of selective metal-vapor deposition, including cathode patterning of organic light-emitting devices, micro-thin-film fuses, multifunctional diffraction gratings, in-plane electrical bistability for memory devices, and metal-vapor integration, have been demonstrated.
  • Noriko Fujinaga, Naoki Nishikawa, Ryo Nishimura, Kengo Hyodo, Seiji Yamazoe, Yuko Kojima, Kazuki Yamamoto, Tsuyoshi Tsujioka, Masakazu Morimoto, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida
    CRYSTENGCOMM 18(38) 7229-7235 2016年  査読有り
    By alternate irradiation with UV and visible light, reversible topographical changes were observed on the microcrystalline surfaces of diarylethene derivatives above the glass transition temperatures (T-g) of their open-ring isomers. For the photogenerated closed-ring isomers, the crystal growth proceeded at the surface softened by molecular movement. This is the self-aggregation of the closed-ring isomers. The photogenerated surface topographies appear depending on the crystal habits of the closed-ring isomers. Reflecting the properties (crystal habits) of diarylethene derivatives, we obtained cubic, needle, and plate-shaped crystals of the closed-ring isomers on the microcrystalline surfaces of the open-ring isomers by irradiation with UV light. Even a derivative having one isopropyl group at a reactive carbon atom, whose closed-ring isomer is thermally unstable, showed photoinduced topographical changes, because the Tg of the open-ring isomer is around ambient temperature.
  • Koji Yamaguchi, Tsuyoshi Tsujioka
    THIN SOLID FILMS 597 220-225 2015年12月  査読有り最終著者責任著者
    We report a selective metal-vapor deposition phenomenon based on solvent printing and evaporation on polymer surfaces and propose a method to prepare fine metal patterns using maskless vacuum deposition. Evaporation of the solvent molecules from the surface caused large free volumes between surface polymer chains and resulted in high mobility of the chains, enhancing metal-vapor atom desorption from the surface. This phenomenon was applied to prepare metal patterns on the polymer surface using solvent printing and maskless metal vacuum deposition. Metal patterns with high resolution of micron scale were obtained for various metal species and semiconductor polymer substrates including poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] and poly(3-hexylthiophene-2,5-diyl). (C) 2015 Elsevier B.V. All rights reserved.
  • Tsuyoshi Tsujioka, Masaki Nobunaga, Megumi Dohi
    ORGANIC ELECTRONICS 26 144-150 2015年11月  査読有り
    Electrical bistability is an essential property for memory devices. We report here the in-plane electrical bistability of photochromic diarylethene (DAE)/Cu composite film, which is prepared by Cu vapor deposition on the DAE surface with a low glass-transition temperature. The low-current level around 10 (8) A was switched to a high-current level of ca. 10 (4) A at a low threshold voltage (Vth) in the first voltage sweep. Once this switching occurred, the high-current level was kept in the second voltage sweep, and electrical bistability was achieved for the in-plane current. Vth was distributed in a wide range of voltages (0.5-10 V), and the colored sample obtained by the UV irradiation showed a relatively higher Vth than the colorless sample. The highest ON-OFF ratio in current was ca. 10(6). The origin of the bistability attributed to the electrical breakdown in the insulated lines that was consisted of DAE in Cu film. The in-plane bistability of the DAE/Cu composite film has good retention time (>60 min) and readout-cycle endurance (>10(6) cycles), indicating that it is suitable for write-once organic semiconductor memory characteristics. (C) 2015 Elsevier B.V. All rights reserved.
  • Naoya Matsui, Tsuyoshi Tsujioka
    ORGANIC ELECTRONICS 15(10) 2264-2269 2014年10月  査読有り
    Photochromic diarylethenes (DAEs) have gained attention as attractive current switching materials by light irradiation in the organic electronics field. We investigated the hole mobility of amorphous films consisting of three types of DAEs using a space-charge-limited current method and a better chemical structure to achieve high mobility. The hole mobility of open-ring (colorless) DAE having benzothiophene rings substituted with triphenylamine (TPA) as an aryl group was 2 x 10(4) times (2 x 10(-6) cm(2)/V s) larger than that of DAE containing thiophene rings without TPA. When the DAE film was irradiated with ultraviolet (UV) light, the hole mobility decreased temporarily at 4% of closed-ring (colored) isomers and then increased to two-three times of the initial colorless state at 85% of the closed-ring isomers. The temporary decrease in the hole mobility originated in the hole trapping effect of the closed-ring molecules in a matrix consisting of open-ring isomers. (C) 2014 Elsevier B.V. All rights reserved.
  • Tsuyoshi Tsujioka, Megumi Dohi
    APPLIED PHYSICS EXPRESS 7(7) 071602 2014年7月  査読有り
    We investigated deposition modulation by noble metals on a photochromic diarylethene (DAE) film. Differences in color and sheet resistance (R-s) between the metal films deposited on the colored and colorless DAE films were observed. We observed R-s ratios of 10(6) for Ag, 10(7) for Cu, and 10(4) for Au. We found that the color and R-s differences were caused by the size differences in the metal nanocrystals on the deposited films. The difference in R-s was increased further after ozone oxidation treatment of the samples. We also demonstrated that this phenomenon can be applied to wiring in electronics and the crosstalk between adjacent wiring can be reduced by ozone oxidation treatment. (C) 2014 The Japan Society of Applied Physics
  • Tsuyoshi Tsujioka
    JOURNAL OF MATERIALS CHEMISTRY C 2(2) 221-227 2014年  査読有り招待有り
    Selective metal deposition signifies that metal vapor atoms are deposited on a hard organic surface but not on a soft (low glass transition temperature) surface. This paper introduces the origin, extension, and device applications of selective metal deposition. A photochromic surface shows the light-controlled selective metal deposition phenomenon, but the surface material is not essential to it; various organic surfaces including organic crystal and polymer surfaces can be used. We demonstrate the applications of selective metal deposition, including cathode patterning for organic light-emitting devices, micro thin-film fuses, and multifunctional diffraction grating. Selective metal deposition can be applied to a variety of electric and optic devices.
  • Tsuyoshi Tsujioka, Naoya Matsui
    JOURNAL OF MATERIALS CHEMISTRY C 2(18) 3589-3596 2014年  査読有り
    Photochromic diarylethene crystal films are promising candidates for future organic memory applications but this has not yet been studied. We found that a specific molecule of photochromic diarylethenes (DAEs) formed a crystal film that consisted of extraordinary large crystallites with a 1 cm scale domain. We investigated the carrier injection/transport characteristics in the DAE crystal film and found that photocontrolled current switching using UV (lambda = 365 nm) irradiation showed a large on- off ratio of 500, which was 50- times that of the amorphous film. Positive temperature dependence of the current was observed for the initial colorless crystal film, whereas negative dependence for the colored and decolored films was observed. The current level of the decolored sample was lower than that of the initial colorless state and the difference in the current levels was based on the change from the crystal to the amorphous state. The results are essential for achieving organic memory applications with DAE crystals.
  • Noriko Fujinaga, Naoki Nishikawa, Shingo Sakiyama, Seiji Yamazoe, Yuko Kojima, Tsuyoshi Tsujioka, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida
    CrystEngComm 15 6 2013年12月28日  
  • Megumi Dohi, Tsuyoshi Tsujioka
    APPLIED PHYSICS EXPRESS 6(9) 091601 2013年9月  査読有り
    The sheet resistance (R-s) of a structure prepared by Ag vapor deposition on an organic photochromic diarylethene (DAE) surface was modulated at a substrate temperature (T-sub) of 50 degrees C. The R-s of a Ag film on the uncolored DAE surface was over 10(6) times higher than that on a colored DAE surface. Such a Ag film with a high R-s was formed by a structure consisting of small Ag nanocrystals. We propose a thin-film micro-fuse (mu-fuse) with a novel structure based on Ag deposition modulation on the DAE surface. The mu-fuse with 700 mu m size blew at a current level of 350 mA at 4.5 V. (c) 2013 The Japan Society of Applied Physics
  • Tsuyoshi Tsujioka
    Soft Matter 9(24) 5681-5685 2013年6月28日  査読有り
    We report a novel function of a polymer coffee-ring surface called metal-vapor deposition modulation where metal-vapor atoms are deposited on the center of the polymer coffee-ring surface using vacuum evaporation but not on the ring-shaped areas at the edge. The essential factor of the metal-deposition modulation is the difference of polymer chain mobility between the center and the ring. In the ring, the solvent evaporation process produces large spaces among surface polymer chains, resulting in high mobility of polymer chains. The desorption of metal vapor atoms from the surface was caused by the high mobility of the polymer chains. This result not only provides new knowledge about the fundamentals of a polymer surface but also suggests a novel technology for engineering and industrial fields using metallic coating technology on polymer surfaces. © 2013 The Royal Society of Chemistry.
  • Naoki Nishikawa, Shingo Sakiyama, Seiji Yamazoe, Yuko Kojima, Ei-ichiro Nishihara, Tsuyoshi Tsujioka, Hiroyuki Mayama, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida
    LANGMUIR 29(25) 8164-8169 2013年6月  査読有り
    We identified the mechanism of the formation of needle-shaped microcrystals on which the contact angle of a water droplet exceeds 170 degrees [Nishikawa, N. et al. Langmuir, 2012, 28, 17817-17824]. The standing needle-shaped crystal of the closed-ring isomer of a diarylethene 3c grew at a much lower temperature than the eutectic temperature by irradiation of UV light on the thin films of the open-ring isomer 3o, due to the epitaxial growth of the 013 plane of 3c over the 110 plane of the crystal lattice of 3o in the subphase. Therefore, the new crystal-growth mechanism triggered by the photoisomerization does not require special inorganic single-crystal substrates and may be called self-epitaxial crystal growth. The needle-shaped crystals appeared well-ordered and stood inclined at an angle of about 60 degrees to the surface. Consequently, the photo-induced rough surface show not only the superhydrophobic lotus effect, but also the antireflection moth-eye effect, and these effects were switchable by alternate irradiation with UV and visible light.
  • Tsuyoshi Tsujioka, Koji Yamaguchi
    Japanese Journal of Applied Physics 52(7) 078002 2013年1月  査読有り
    We report selective metal deposition on a phase-separated polymer blend surface. A polymer blend film consisting of polystyrene (PS) and a polystyrene-block-polybutadiene copolymer (PS-BR) was annealed, and a micro-phase-separated film was obtained. Pb was evaporated onto the phase-separated surface without an evaporation mask and was selectively deposited on the PS phase but not on the PS-BR phase. We achieved fine metal patterns corresponding to the microphase separation. This result suggests a novel method of preparing fine metal patterns for electronics and photonics. © 2013 The Japan Society of Applied.
  • Noriko Fujinaga, Naoki Nishikawa, Shingo Sakiyama, Seiji Yamazoe, Yuko Kojima, Tsuyoshi Tsujioka, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida
    CRYSTENGCOMM 15(42) 8400-8403 2013年  査読有り
    By alternate irradiation with UV and visible light, reversible topographical changes were observed. Step and valley formation while keeping the crystal confinement was observed below the glass transition temperature (T-g), while crystal growth via a softened state was observed above the T-g on the same diarylethene crystalline surface.
  • Naoki Nishikawa, Hiroyuki Kiyohara, Shingo Sakiyama, Seiji Yamazoe, Hiroyuki Mayama, Tsuyoshi Tsujioka, Yuko Kojima, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida
    LANGMUIR 28(51) 17817-17824 2012年12月  査読有り
    A superhydrophobic surface on which the contact angle of a water droplet exceeds 170 degrees was reversibly produced by alternate irradiation with UV and visible light. Superhydrophobicity is due to the formation of densely generated submicrometer sized needle-shaped crystals (less than 0.2-0.3 mu m diameter and 2.2-2.5 mu m long) at 30 degrees C, which is much lower than the eutectic temperature of either isomers of the diarylethene. Below the eutectic temperature, the generated crystals were much smaller than those generated above the eutectic temperature. These smaller crystals more effectively enhanced the superhydrophobicity.
  • Tsuyoshi Tsujioka, Megumi Dohi
    APPLIED PHYSICS EXPRESS 5(4) 041603 2012年4月  査読有り
    We report light-controlled selective Pb deposition on a photochromic surface. Pb evaporation onto the photochromic surface with isomerization patterns at room temperature (24 degrees C) generated no selective deposition; however a slight increase of the substrate temperature around 10-15 degrees C enabled the perfect selective Pb deposition, that is, Pb was deposited on the colored surface but not on the uncolored surface. A preparation of thin-film microfuse (mu-fuse) based on selective Pb deposition was demonstrated using laser scanning and maskless Pb evaporation. The mu-fuse showed a highly sensitive interrupt current level. (C) 2012 The Japan Society of Applied Physics
  • Tsuyoshi Tsujioka, Kosuke Tsuji
    APPLIED PHYSICS EXPRESS 5(2) 021601 2012年2月  査読有り
    Metal-vapor deposition modulation on soft polymer surfaces and its applications are reported. A soft viscous surface of poly(dimethylsiloxane) (PDMS) with a glass transition temperature (T-g) of -123 degrees C showed perfect desorption at room temperature for many kinds of metal vapor. Metal-vapor deposition modulation on PDMS surfaces was applied to the Ca-cathode patterning of an organic light-emitting device, the preparation of thin-film Pb fuse, and the Mg vapor transportation by a pipeline, indicating great potential in various fields of basic research, engineering, and industry. (C) 2012 The Japan Society of Applied Physics
  • Tsuyoshi Tsujioka, Toshiyuki Sasa, Yasuhiro Kakihara
    Organic Electronics 13 681 2012年2月  査読有り
  • Tsuyoshi Tsujioka, Naoya Matsui
    OPTICS LETTERS 37(1) 70-72 2012年1月  査読有り
    We introduce photoreprogrammable dual-function gratings, which show different diffraction in transmission and reflection. Parallel metal lines on the photochromic diarylethene (DAE) surface were prepared by selective metal deposition, enabling one-dimensional diffraction in transmission and reflection. Then, another isomerization pattern was programmed on the DAE layer by light irradiation. This grating generated unique diffraction: onedimensional diffraction in the reflection but two-dimensional diffraction in the transmission, and a dual-function grating was achieved. This programmed state on the DAE layer could be erased by UV irradiation and could be reprogrammed to generate different diffraction by visible laser scanning. This result shows the great potential of the photoreprogrammable dual-function grating as a key element in various future optical devices and systems. (C) 2011 Optical Society of America
  • Keita Tani, Koji Kubono, Kazushige Hori, Kentaro Shoji, Goji Shiga, Muneyuki Yamamoto, Tsuyoshi Tsujioka
    CHEMISTRY LETTERS 40(11) 1267-1268 2011年11月  査読有り
    Diarylethene derivatives, 1c and 1d, having carrier mobilization sites have been synthesized. Their photochromic properties are examined both in solution and in thin film. Current voltage characteristics at photostationary state of 1c and 1d showed drastic current increase compared with the corresponding open-ring isomers 1c and 1d, respectively.
  • Shinichiro Nakamura, Satoshi Yokojima, Kingo Uchida, Tsuyoshi Tsujioka
    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 12(2) 138-150 2011年9月  査読有り
    A diarylethene (DAE) study using thermodynamical physical chemistry, elemental fractal analysis, and quantum chemistry is presented. Attention is focused on the ways the polymer environment affects DAE photochromism and on the ways that DAE photochromism affects surfaces. Non-constant quantum yields in single-molecule measurements, selective metal deposition, and a super-water-repellent fractal surface are discussed after a short summary of the latest experimental results concerning photochromism in DAE molecules. (C) 2011 Elsevier B.V. All rights reserved.
  • Tsuyoshi Tsujioka, Naoya Matsui
    OPTICS LETTERS 36(18) 3648-3650 2011年9月  査読有り
    Dual-functional diffraction gratings, which show different diffractions in transmission and reflection, are proposed as an essential optical element. We utilize a flattening effect of photochromic diarylethene (DAE) in the low glass transition temperature state and selective metal deposition to prepare the gratings. The uncolored lines of the colored DAE layer on a grating substrate with grooves were formed by red-laser scanning, and Mg evaporation onto the substrate without a shadow mask enabled Mg-line formation at right angles to the grooves. After being stored at 27 degrees C for 500 min, the sample showed two-dimensional diffraction in reflection but one-dimensional diffraction in transmission, meaning that a dual-functional grating was achieved. This result shows great potential as a key element for various future optical devices and systems. (C) 2011 Optical Society of America
  • Yusuke Iwai, Tsuyoshi Tsujioka
    JAPANESE JOURNAL OF APPLIED PHYSICS 50(8) 081602 2011年8月  査読有り
    We report on metal deposition selectivity on a photochromic diarylethene (DAE) surface in intermediate vacuum. Selective deposition means that metal vapor is deposited on colored DAE but not on uncolored. Mg was evaporated on the DAE surfaces at various pressures with the introduction of inert gas. Mg was easy to deposit on the uncolored DAE surface in intermediate vacuum (2 x 10(-1) Torr). The easy-deposition effect in intermediate vacuum was explained by the re-adsorption of Mg atoms desorbed from the DAE surface. Mg cathode patterning of an organic light emitting device on the basis of selective deposition in the intermediate vacuum was successfully demonstrated. (C) 2011 The Japan Society of Applied Physics
  • Koji Kubono, Teruo Synmyouzu, Kenta Goto, Tsuyoshi Tsujioka, Keita Tani
    Acta Cryst. E 67 o2194 2011年7月  査読有り
  • Tsuyoshi Tsujioka, Daisuke Natsume, Itaru Onishi
    Optics InfoBase Conference Papers 2011年  
    Photocurrent switching for nondestructive readout of photochromic memory is reported. The photoisomerization of a diarylethene (DAE) molecule in a memory layer switched the photocurrent generated by laser light irradiation. The switching is based on an ionization potential change of the DAE molecules. Excellent ON-OFF ratio of photocurrent was achieved by the irradiation at 780 nm. When the pulsed laser light with a wavelength of 780 nm was repeatedly irradiated to the colored (recorded) and uncolored (initial) memory states, no change of the photocurrent signal levels was observed even after 800x103 cycles, indicating a successful demonstration of the nondestructive readout. © 2011 OSA.
  • Tsuyoshi Tsujioka
    JOURNAL OF MATERIALS CHEMISTRY 21(34) 12639-12643 2011年  査読有り
    In organic electronics, organic crystals are essential materials, and metal deposition on organic surfaces is an important process. We report light-controlled metal deposition on photosensitive organic crystals. Light irradiation to the photosensitive diarylethene (DAE) crystal surface generated another isomer in the crystal lattice and made the surface soft, which caused the Mg-undeposition effect. The light-controlled selective Mg deposition can be applied to fine metal patterning by laser scanning and maskless evaporation. Fine parallel and grid Mg patterning on the DAE crystal surface are demonstrated successfully. This method is promising for fine electrode patterning of various electronics devices with an organic crystal.
  • Tsuyoshi Tsujioka, Itaru Onishi, Daisuke Natsume
    APPLIED OPTICS 49(20) 3894-3899 2010年7月  査読有り
    We report on photocurrent switching based on photoisomerization for the nondestructive readout of photochromic optical memory. The photoisomerization of a diarylethene (DAE) memory layer switched the photocurrent generated in a light-absorbing phthalocyanine layer upon irradiation of a laser light. This switching is based on the ionization potential change of the DAE molecules. Switching characteristics of the photocurrent were investigated for the laser light with a wavelength of 410 nm, 630 nm, or 780 nm. Excellent on-off ratios of the photocurrent were achieved by irradiation at 630 nm and 780 nm. When the pulsed laser light with a wavelength of 780 nm was repeatedly irradiated to the colored and uncolored memory devices, no change of the photocurrent signal levels was observed, even after 8 x 10(5) cycles, indicating a successful demonstration of the nondestructive readout. (C) 2010 Optical Society of America
  • Yusuke Sesumi, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida, Tsuyoshi Tsujioka
    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 83(7) 756-761 2010年7月  査読有り
    Selective metal deposition controlled by light irradiation was achieved for Zn, Mg, and Mn on a photochromic diarylethene (DAE) film; metal vapor atoms were deposited only on the colored film but not on the uncolored film. The deposition properties of the metals were strongly dependent on the deposition rates. Fine metal patterns were produced by laser scanning and a conventional vacuum-evaporation method without a shadow mask. Multiple-metal pattern preparation of Zn, Mg, and Mn via a maskless evaporation in a single vacuum process was also demonstrated.
  • Tsuyoshi Tsujioka, Masahiro Irie
    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 11(1) 1-14 2010年3月  査読有り
    Recent progress in electrical properties of photochromic molecules is reviewed. A typical application of the properties is current switching based on the changes in ionization potential or carrier mobility induced by the photoisomerization of photochromic molecules. Carrier injection-type molecular memories have also attracted wide interest because they are a promising candidate for organic semiconductor devices in the field of organic electronics. Various new applications are proposed using photo-induced electrical, as well as optical, property changes of photochromic molecules. (C) 2010 Elsevier B.V. All rights reserved.
  • Tsuyoshi Tsujioka, Muneyuki Yamamoto, Kentaro Shoji, Keita Tani
    PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES 9(2) 157-161 2010年  査読有り
    Electrical carrier separation from a photoexcited photochromic molecule could be a promising method for controlling the photosensitivity of such a molecule. We report an efficient carrier separation from a photochromic diarylethene (DAE) molecule by adopting a device structure with a heterojunction consisting of an n-type diarylethene layer and a p-type layer of N,N'-di(1-naphthyl)-N,N'-diphenylbenzidine (NPB). A photocurrent originating from carrier separation for the colored photostationary state was observed, even at zero applied voltage. The efficient carrier separation occurred at the interface between the DAE and NPB layers and was the result of the internal electrical field induced by the pn heterojunction.

MISC

 11

講演・口頭発表等

 18

共同研究・競争的資金等の研究課題

 14