Refine your search:     
Report No.
 - 
Search Results: Records 1-5 displayed on this page of 5
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Electron-beam-induced color imaging of acid-chromic polymer films

Maekawa, Yasunari; Yuasa, Kanako*; Enomoto, Kazuyuki; Matsushita, Harumi*; Kato, Jun*; Yamashita, Takashi*; Ito, Kazuo*; Yoshida, Masaru

Chemistry of Materials, 20(16), p.5320 - 5324, 2008/08

 Times Cited Count:2 Percentile:9.32(Chemistry, Physical)

Polymer films with acid-responsive chromic dyes and acid generators have been designed for an electron beam (EB)-induced color imaging system. Arylsulfonic acid esters and triphenylsulfonium salts were used as an EB-sensitive acid generator; the acid (H$$^{+}$$) allows a chromic reaction with rhodamine B base (RB) and 4,4'-bis(dimethylamino)benzhydrol (BH) to be triggered. Upon EB irradiation, poly(methyl methacrylate) (PMMA) films consisting of RB or BH and acid generators exhibited a characteristic absorption band with $$lambda$$max at 560 and at 612 nm, respectively, and an isosbestic point. These spectral changes clearly indicate that colorless chromic dyes in PMMA are transformed selectively to the colored form. The color imaging of these films was performed by electron beam direct writing (EBDW) with a 50 nm diameter beam to form 100 - 1000 nm line and space patterns and was evaluated by optical and confocal laser microscopy. EBDW on the acid chromic polymer films, especially for BH, yielded clear color imaging of 100 - 200 nm line and space patterns with a dose of only 10 $$mu$$C/cm$$^{2}$$. The confocal laser microscopy gave thinner lines than the laser wavelength (632.8 nm), probably because of the large change in refractive index of the patterned film induced by EB irradiation even with a low energy dose.

Journal Articles

Refractive index change and color imaging of acid-chromic polymer films using EB-induced acid generation

Kato, Jun; Yuasa, Kanako; Matsushita, Harumi*; Maekawa, Yasunari; Enomoto, Kazuyuki; Ishii, Tatsuhito*; Ito, Kazuo*; Yamashita, Takashi*

Journal of Photopolymer Science and Technology, 19(1), p.105 - 110, 2006/00

 Times Cited Count:2 Percentile:6.52(Polymer Science)

The novel electron beam (EB)-induced color imaging system, consisting of polymer films with acid-responsive chromic molecules (chromic dyes) and EB-acid generators (EBAGs) was proposed. EB irradiation of the acid-chromic polymer films induced acid generation from EBAG, resulting in color formation of the acid-chromic molecules (protonated forms). Nanoscale color imaging on the acid- chromic polymer films was carried out using EB scanning direct drawing. Clear color imaging of 200 nm square and 100 nm line/space patterns could be observed with a dose of only 50 $$mu$$C cm$$^{-2}$$. Furthermore, the large EB-induced refractive index change of these films (0.013 at 632.8 nm) was observed in both TE and TM modes by an m-line method, which is sufficient to create an optical circuit.

Journal Articles

Electron-beam-induced fries rearrangement and oxidation reactions of sulfonic acid esters in crystalline state

Yuasa, Kanako; Enomoto, Kazuyuki*; Maekawa, Yasunari; Kato, Jun*; Yamashita, Takashi*; Yoshida, Masaru

Journal of Photopolymer Science and Technology, 17(1), p.21 - 28, 2004/07

 Times Cited Count:9 Percentile:31.15(Polymer Science)

The electron beam (EB)-induced reactions of arylsulfonic acid esters, phenyl p-toluenesulfonate (1a), phenyl benzenesulfonate (1b), and phenyl 1-naphthalenesulfonate (1c), were examined in the balk state. The EB irradiation of 1a afforded the Fries rearrangement products, o- and p-hydroxyphenyl p-tolylsulfones (2a and 3a), phenol (5), and the oxidation product of 2a, o,p-dihydroxyphenyl p-tolylsulfone (4a), which has not been observed in photolysis. The irradiation of 1b, which is liquid at room temperature, gave Fries products, 5, and the oxidation product, o,p-dihydroxyphenyl phenylsulfone. On the other hand, the EB-induced reaction of 1c proceeded with the lowest reactivity through crystal to crystal transformation to afford Fries products and 5, but not oxidation product. The mechanistic study reveals that oxidation product 4a generated by the oxidation reaction of ortho-Fries product 2a but not para-isomer 3a with an active oxidant, which should result from the decomposition of 1a.

Oral presentation

Electron beam-induced color imaging of acid-chromic polymer films

Enomoto, Kazuyuki; Yuasa, Kanako*; Kato, Jun*; Matsushita, Harumi*; Yamashita, Takashi*; Ito, Kazuo*; Yoshida, Masaru; Maekawa, Yasunari

no journal, , 

The polymer films with acid-responsive chromic molecules Rhodamine B base and 4,4'-bis(dimethylamino)benzhydrol as an acid-chromic compound with electron beam-acid generators were well designed for the novel electron beam-induced color imaging system. Electron beam scanning direct drawing of the acid-chromic polymer films gave clear color imaging of 100-200 nm line/space patterns with a dose of only 10 $$mu$$C cm$$^{-2}$$.

Oral presentation

Electron beam-induced reaction of polymer films containing chromic dye molecules

Enomoto, Kazuyuki; Yuasa, Kanako*; Kato, Jun*; Matsushita, Harumi*; Yamashita, Takashi*; Ito, Kazuo*; Yoshida, Masaru; Maekawa, Yasunari

no journal, , 

A color forming performance for fabricating nanoscale patterned polymer films has been examined using electron beam direct writing (EBDW) techniques. Upon EB irradiation the poly(methyl methacrylate) film consisting of 3 wt% bis(dimethylamino)benzhydrol and the equimolar sulfonium salt has an absorption band at 560 nm, which is assigned to protonated benzhydrol. The appearance of the new band at 560 nm with an isosbestic point in the spectral changes of indicates the quantitative transformation from colorless benzhydrol to the protonated form. The film is then exposed with a raster scanning by EBDW. Upon EB irradiation they also undergo chemical changes to provide optical differentiation between the exposed and unexposed regions. The blue-colored line/space patterns of 100 - 200 nm with a dose of 10 $$mu$$C/cm$$^{2}$$ are achieved.

5 (Records 1-5 displayed on this page)
  • 1