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Yamasaki, Chisato*; Murakami, Katsuhiko*; Fujii, Yasuyuki*; Sato, Yoshiharu*; Harada, Erimi*; Takeda, Junichi*; Taniya, Takayuki*; Sakate, Ryuichi*; Kikugawa, Shingo*; Shimada, Makoto*; et al.
Nucleic Acids Research, 36(Database), p.D793 - D799, 2008/01
Times Cited Count：52 Percentile：71.15(Biochemistry & Molecular Biology)Here we report the new features and improvements in our latest release of the H-Invitational Database, a comprehensive annotation resource for human genes and transcripts. H-InvDB, originally developed as an integrated database of the human transcriptome based on extensive annotation of large sets of fulllength cDNA (FLcDNA) clones, now provides annotation for 120 558 human mRNAs extracted from the International Nucleotide Sequence Databases (INSD), in addition to 54 978 human FLcDNAs, in the latest release H-InvDB. We mapped those human transcripts onto the human genome sequences (NCBI build 36.1) and determined 34 699 human gene clusters, which could define 34 057 protein-coding and 642 non-protein-coding loci; 858 transcribed loci overlapped with predicted pseudogenes.
Takabayashi, Susumu*; Fukuda, Akito*; Tsukazaki, Ryuta*; Koga, Hisashi*; Yamaguchi, Hisato*; Ogawa, Shuichi*; Takakuwa, Yuji*; Tsuda, Yasutaka; Yoshigoe, Akitaka
no journal, ,
Graphene has a wide variety of potential applications, including as a channel material in field-effect transistors and as a gas barrier film. The chemical modification and reformation of graphene was studied using photoemission-assisted plasma. In the C 1s photoelectron spectra of graphene/Cu substrates treated under Townsend discharge conditions, which prevent ion damage, both sp2 carbon (sp2 C-C, sp2 C-H) of graphene and a sp3 carbon (sp3 C-H) were observed by synchrotron radiation XPS, indicating that the six-membered ring structure of graphene was cleaved and hydrogen was bonded to it. On the other hand, annealing in a hydrogen-reducing atmosphere resulted in the disappearance of the sp3 C-H and sp2 C-H peaks and the appearance of the sp3 C-C peak, corresponding to hydrogen desorption.
Fukuda, Akito*; Takabayashi, Susumu*; Yamaguchi, Hisato*; Ogawa, Shuichi*; Takakuwa, Yuji*; Tsuda, Yasutaka; Yoshigoe, Akitaka
no journal, ,
Chemical modification and modification of graphene is widely required. In this presentation, we report the results of XPS analysis of graphene treated in a photoemission assisted Townsend discharge (PATD) regime, which can prevent ion damage. The XPS peaks assigned with sp2 carbon (sp2 C-C, sp2 C-H) and sp3 carbon (sp3 C-H) were observed, suggesting that the six-membered ring structure of graphene was cleaved and hydrogen was bonded to the cleaved structure. After annealing at 700
C for 20 min under an H2-reduction, sp3 C-H and sp2 C-H peaks disappeared and the sp3 C-C peak appeared. Hydrogen is thought to be desorbed by the annealing treatment.
Fukuda, Akito*; Takabayashi, Susumu*; Naito, Haruhiro*; Tanaka, Shuto*; Yamaguchi, Hisato*; Ogawa, Shuichi*; Takakuwa, Yuji*; Tsuda, Yasutaka; Yoshigoe, Akitaka
no journal, ,
Although modification or chemical modification is necessary in graphene applications, the damage due to the modification processes is a serious problem. In this conference, it is reported that the defects confirmed by D-band peak in Raman spectroscopy can be selectively controlled by using the Townsend discharge region of photoemission-assisted plasma, which can prevent ion damage.
Takabayashi, Susumu*; Fukuda, Akito*; Naito, Haruhiro*; Tanaka, Shuto*; Yamaguchi, Hisato*; Ogawa, Shuichi*; Takakuwa, Yuji*; Tsuda, Yasutaka; Yoshigoe, Akitaka
no journal, ,
Modification and chemical modification are required in graphene applications. Photoemission-assisted plasma has attracted attention as a novel process method to prevent ion damage. In only Ar ambient, the sp3 CH peak was observed in the XPS spectrum in addition to the peak attributed to the basal structure of graphene (C-C, C-H). The six-membered ring structure of graphene is considered to be cleaved and hydrogen is added. Annealing in H
ambient caused the disappearance of the sp3 C-H and sp2 C-H peaks and the appearance of a new sp3 C-C peak. This result suggests that hydrogen desorption seems to take place during annealing.
Fukuda, Akito*; Naito, Haruhiro*; Tanaka, Shuto*; Yamaguchi, Hisato*; Ogawa, Shuichi*; Takakuwa, Yuji*; Tsuda, Yasutaka; Yoshigoe, Akitaka; Takabayashi, Susumu*
no journal, ,
Graphene is a two-dimensional material. Its outstanding characteristics such as gas-barrier properties have been remarked. To improve these characteristics or find new one, its modification is indispensable; however, the existing methods may destroy or reduce properties: implantation, adsorption, and chemical modification. We have been using low-energy ion attack of photoemission-assisted Townsend discharge (PATD) plasma. In conventional radio-frequency discharge plasma, a sheath electric field may cause severe damage to graphene. Because of the displacement current, both current and voltage are difficult to measure independently and precisely. Power in watt, which is a product of current and voltage, is used as a variable. However, the current is an extensive variable and is a factor of kinetics of chemical reactions. The voltage is an intensive variable and is a factor of thermodynamics. PATD is a DC plasma. Thus, we can expect precisely-controlled graphene by PATD.
