JOPSS - Search Results

Search Results: Records 1-20 displayed on this page of 43

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 ...

Journal Articles

Micro-orientation control of silicon polymer thin films on graphite surfaces modified by heteroatom doping

Shimoyama, Iwao; Baba, Yuji; Hirao, Norie*

Advances in Engineering (Internet), 1 Pages, 2018/02

The performance of organic devices largely depends on molecular orientation in organic films. Whereas micro-orientation control of organic molecules is an indispensable technology for integration of organic devices, the method has not been established. We attempted to control micro-orientation of polydimethylsilane (PDMS) thin films by deposition of PDMS on graphite substrates modified by hetero atom doping using ion beam. Polarization dependence measurements of X-ray absorption spectroscopy and molecular orbital calculations clarified that PDMS films have lying, standing, and random orientations on the non irradiated, N $_{2}$ $^{+}$ -irradiated, and Ar $^{+}$ -irradiated graphite surfaces, respectively. Furthermore, photoemission microscopy observation clarified that a PDMS film showed micro-patterns on a graphite surface with a microstructure on the order of m by separating N $_{2}$ $^{+}$ -irradiated and non irradiated areas. These results demonstrate our method is promising for micro-orientation of organic molecules.

Journal Articles

Micro-orientation control of silicon polymer thin films on graphite surfaces modified by heteroatom doping

Shimoyama, Iwao; Baba, Yuji; Hirao, Norie*

Applied Surface Science, 405, p.255 - 266, 2017/05

https://doi.org/10.1016/j.apsusc.2017.01.297

Times Cited Count：1 Percentile：5.94(Chemistry, Physical)

NEXAFS spectroscopy is applied to study orientation structures of polydimethylsilane (PDMS) films deposited on heteroatom-doped graphite substrates prepared by ion beam doping. The Si -edge NEXAFS spectra of PDMS show opposite trends of polarization dependence for non irradiated and N $_{2}$ $^{+}$ -irradiated substrates, and show no polarization dependence for an Ar $^{+}$ -irradiated substrate. Based on a theoretical interpretation of the NEXAFS spectra via first-principles calculations, we clarify that PDMS films have lying, standing, and random orientations on the non irradiated, N $_{2}$ $^{+}$ -irradiated, and Ar $^{+}$ -irradiated substrates, respectively. Furthermore, photoemission electron microscopy indicates that the orientation of a PDMS film can be controlled with microstructures on the order of m by separating irradiated and non irradiated areas on the graphite surface. These results suggest that surface modification of graphite using ion beam doping is useful for micro-orientation control of organic thin films.

Journal Articles

Tritium release from bulk of carbon-based tiles used in JT-60U

Takeishi, Toshiharu*; Katayama, Kazunari*; Nishikawa, Masabumi*; Masaki, Kei; Miya, Naoyuki

Journal of Nuclear Materials, 349(3), p.327 - 338, 2006/03

https://doi.org/10.1016/j.jnucmat.2005.10.018

Times Cited Count：6 Percentile：41.45(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Recovery of retained tritium from graphite tile of JT-60U

Takeishi, Toshiharu*; Katayama, Kazunari*; Nishikawa, Masabumi*; Miya, Naoyuki; Masaki, Kei

Fusion Science and Technology, 48(1), p.565 - 568, 2005/07

https://doi.org/10.13182/FST05-A988

Times Cited Count：1 Percentile：10.45(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Local bonding states of ion-irradiated graphite characterized by photon-stimulated desorption (PSD) spectroscopy

Sekiguchi, Tetsuhiro; Baba, Yuji; Shimoyama, Iwao; Nath, K. G.

Journal of Electron Spectroscopy and Related Phenomena, 144-147, p.437 - 441, 2005/06

https://doi.org/10.1016/j.elspec.2005.01.156

Times Cited Count：3 Percentile：17.62(Spectroscopy)

no abstracts in English

Journal Articles

Tritium release behavior from the graphite tiles used at the dome unit of the W-shaped divertor region in JT-60U

Katayama, Kazunari*; Takeishi, Toshiharu*; Manabe, Yusuke*; Nagase, Hiroyasu*; Nishikawa, Masabumi*; Miya, Naoyuki

Journal of Nuclear Materials, 340(1), p.83 - 92, 2005/04

https://doi.org/10.1016/j.jnucmat.2004.11.005

Times Cited Count：8 Percentile：49.16(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

B-C-N hybrid synthesis by high-temperature ion implantation

Uddin, M. N.; Shimoyama, Iwao; Baba, Yuji; Sekiguchi, Tetsuhiro; Nath, K. G.; Nagano, Masamitsu*

Applied Surface Science, 241(1-2), p.246 - 249, 2005/01

https://doi.org/10.1016/j.apsusc.2004.09.040

Times Cited Count：8 Percentile：37.11(Chemistry, Physical)

Recently, much attention has been given on the synthesis and characterization of graphite-like B-C-N hybrid. Since graphite-like B-C-N hybrid may have semiconducting property, this material is interesting for applications to electronic and luminescent devices. In order to synthesize this material, borazine ion plasma was implanted in graphite at room temperature (RT) and 600 $^{circ}$ C. An ultrahigh vacuum (UHV) chamber with base pressure 10 $^{-7}$ Pa was used for the experiment. The X-ray photoelectron spectroscopy (XPS) study suggested that B atoms in the deposited films are in a wide variety of atomic environment such as BC3, BN3 and B-C-N hybrid. The ratios of these coordinations strongly depend on the temperature during the ion implantation. It was found that the B-C-N hybrid is predominantly synthesized by the implantation at 600 $^{circ}$ C where the surface [B]/([B]+[C]+[N]) ratio ranges from 0.1 to 0.35. The results imply that it is possible to control the composition of B-C-N hybrid by changing the fluence of the ion plasma and the temperature of graphite during ion implantation.

Journal Articles

Characterization of B-C-N hybrid prepared by ion implantation

Shimoyama, Iwao; Baba, Yuji; Sekiguchi, Tetsuhiro; Nath, K. G.; Sasaki, Masayoshi*; Okuno, Kenji*

Journal of Vacuum Science and Technology A, 21(6), p.1843 - 1848, 2003/11

https://doi.org/10.1116/1.1611887

Times Cited Count：6 Percentile：28.18(Materials Science, Coatings & Films)

Ion implantation method is applied to synthesize B-C-N hybrids and their electronic structures are characterized by X-ray photoelectron spectroscopy. A boron nitride film is deposited on a graphite target by borazine plasma implantation. At the interface between the BN film and the graphite, variety of bonding combinations including B-N, B-C, and C-N are observed. This proved that B-C-N hybrids is formed by this method.

Journal Articles

Hydrogen isotope behavior in in-vessel components used for DD plasma operation of JT-60U by SIMS and XPS technique

Oya, Yasuhisa*; Hirohata, Yuko*; Morimoto, Yasutomi*; Yoshida, Hajime*; Kodama, Hiroshi*; Kizu, Kaname; Yagyu, Junichi; Goto, Yoshitaka*; Masaki, Kei; Okuno, Kenji*; et al.

Journal of Nuclear Materials, 313-316, p.209 - 213, 2003/03

https://doi.org/10.1016/S0022-3115(02)01451-4

Times Cited Count：25 Percentile：82.89(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Take-off/incident-angle-dependence of / peak intensity ratio in soft X-ray emission and absorption spectra of graphite and hexagonal boron nitride

Muramatsu, Yasuji; Gullikson, E. M.*; Perera, R. C. C.*

Advances in X-Ray Chemical Analysis, Japan, 34, p.153 - 163, 2003/00

Take-off/incident-angle-resolved soft X-ray emission and absorption spectra of highly oriented pyrolytic graphite (HOPG) and hexagonal boron nitride (h-BN) are measured by using polarized synchrotron radiation. The angle-dependent / peak intensity ratio can be explained by the configuration of - and -orbitals, which provides the information of layer ordering in the graphite-like layered materials.

Journal Articles

Local structures analysis of carbon nitride films by utilizing NEXAFS spectroscopy

Shimoyama, Iwao

Hoshako, 15(1), p.12 - 19, 2002/01

http://www.jssrr.jp/journal/pdf/15/p012.pdf

Since the prediction of the possibility that carbon nitride would have super hard property which exceeds that of diamond, considerable efforts to synthesize this material have been employed. However, local structures in carbon nitride films synthesized have not been revealed enough. We study the local structures utilizing synchrotron radiation and revealed the existence of three kinds of local structures in carbon nitride films, i.e., cyanic structure which has C≡N triple bond, pyridine-like structure which has C=N double bond, and graphite-like structure in which carbon atom is substituted by nitrogen atom in graphite network. In this article, I explain the method of near edge X-ray absorption fine structure (NEXAFS) that we used for this study, and from the comparison with X-ray photoelectron spectroscopy (XPS), I comment the availability of NEXAFS to study the local structures in new materials.

JAEA Reports