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Plasma-Confinement Physics Study in Compact Helical System
stoichi Okamura,A. Fujisawa,A. Shimizu,C. Takahashi,C. Suzuki,H. Iguchi,H. Nakano,H. Matsushita,K. Nagaoka,K. Matsuo,K. Ida,K. Toi,K. Nakamura,K. Matsuoka,M. Yoshinuma,M. Isobe,M. Takeuchi,R. Ikeda,S. 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
In a CHS experiment, various types of transport barrier have been studied. An internal transport barrier (ITB) for electrons in a stellarator was first found in CHS, and the ITB for improved ion confinement was also found. H-mode (edge transport barrier) study in CHS showed many common features in transition to tokamak experiments, although the magnetic surface quantities are very different. Discharges with a combination of ETB and ITB were also found. Two heavy ion beam diagnostics in CHS showed a new direct measurement of zonal flow structure in toroidal confinement. The relation between the fluctuation and the transport barrier was also studied.
PbTiO_3 thin films grown on Pt-covered vicinal SrTiO_3(001) substrates
H. Fujisawa,H. Yane,Y. Hiki,S. Nakashima,M. Shimizu 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
We investigated the growth behavior and domain structure of PbTiO_3 thin films on Pt-covered SrTiO_3 (100) (STO) substrates by metalorganic chemical vapor deposition. The step height and terrace width of single-crystalline Pt films on 1 - 4˚ vicinal STOs along [100] and [110] were 1 - 6 and 80 - 150 nm, respectively. PbTiO_3 films were grown in the Volmer-Weber mode on Pt-covered vicinal STOs, and nanosized islands were formed at the early growth stage. Atomic force microscopy revealed that nucleation of PbTiO_3 predominantly occurred at ascending steps on the Pt surface, and that the lateral growth of PbTiO_3 islands was limited by the steps. X-ray diffraction analysis and piezoresponse force microscopy indicated that a-domain and misfit dislocations were anisotropically introduced in PbTiO_3 thin films on Pt/4˚-vicinal STO along [100]. On [110]-vicinal STOs, no significant influence of the vicinal substrate on the growth behavior or domain structure of PbTiO_3 was observed.
H. Fujisawa,H. Niu,M. Shimizu,M. Sugata 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
We demonstrated deep level transient spectroscopy (DLTS) and isothermal capacitance transient spectroscopy (ICTS) measurements for metal/insulator/semiconductor (MIS) and metal/ferroelectric/insulator/semiconductor (MFIS) structures using insulating TiO2, ZrO2 and ferroelectric Pb(Zr,Ti)O3 (PZT) layers grown by metalorganic chemical vapor deposition (MOCVD). Interface trap densities of MIS diodes with ZrO2 and TiO2 layers measured by the DLTS method were 1:5 3:9 1011 and 5:2 5:5 1011 eV..1cm..2, respectively. By the ICTS method, interface trap densities were successfully measured as 5:4 1011 and 1:5 1012 eV..1cm..2 for Au/PZT/ZrO2/Si diodes with and without plasma nitridation of Si surface.
Preparation of IrO2 Thin Films by MOCVD Using Ir(EtCp)(CHD)
H. Fujisawa,S. Watari,H. Niu,M. Shimizu,N. Oshima 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
We report on MOCVD of IrO2 thin lms by using liquid Ir precursor, Ir(EtCp)(CHD). IrO2 lms were successfully grown on SiO2/Si, Ti/SiO2/Si and Pb(Zr,Ti)O3/Pt/SiO2/Si at 400C and oxygen concentration of as high as 77 %. IrO2 lms prepared on SiO2/Si with and without surfaceoxidizedIr seeds exhibited an electrical resistivity of 103 cm, and a root-mean-square surface roughness of 5 nm. IrO2 lms showed step coverages of 40-50%on SiO2-stepped substrate with L/S (line and space) of 0.7/3.6 and 1.4/2.9 m.
Kang, C.S.,Fujisawa, K.,Ko, Y.I.,Muramatsu, H.,Hayashi, T.,Endo, M.,Kim, H.J.,Lim, D.,Kim, J.H.,Jung, Y.C.,Terrones, M.,Dresselhaus, M.S.,Kim, Y.A. Pergamon Press ; Elsevier Science Ltd 2016 Carbon Vol.107 No.-
<P>Linear carbon chains (LCCs) consisting of sp-hybridized carbon atoms are considered a fascinating 1D system and could be used in the fabrication of the next-generation molecular devices because of its ideal linear atomic nature. A large portion of long LCCs inside multi-walled carbon nanotubes (MWCNTs) were synthesized by atmospheric arc discharge in the presence of boron. Closed-end growth of MWCNTs in the arc process is suggested as a critical condition for the simultaneous growth of LCCs within the inner cores of carbon nanotubes. The strong Raman line around 1850 cm(-1) was used to characterize the degree of filling as well as their structural stability under high temperature thermal treatments. We observed a distinctive change in the electrical conductivity of the MWCNT assembly before and after the disappearance of LCCs due to the expected strong coupling interaction between the LCCs and the innermost tube. This work demonstrates for the first time the enhanced effect of confined linear carbon chains on the overall electrical conductivity of MWCNT assemblies. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Fujisawa, K.,Ka, I.,Le Borgne, V.,Kang, C.S.,Kobayashi, K.,Muramatsu, H.,Hayashi, T.,Kim, Y.A.,Endo, M.,Terrones, M.,El Khakani, M.A. Pergamon Press ; Elsevier Science Ltd 2016 Carbon Vol.96 No.-
<P>Carbon nanotubes (CNTs)/lead sulfide (PbS) quantum dots (QDs) nanohybrids have been synthesized through the controlled decoration of CNTs by PbS-QDs by means of the pulsed laser deposition technique. The size of the PbS-QDs and their surface coverage of the CNTs' surface are monitored through the number of laser ablation pulses. Here, while comparing both single-walled (SW) and double-walled (DW) CNTs based nanohybrids, focus is put on the investigation of their interfacial structure and the effect of inner tube. Anchoring PbS through direct sulfur-carbon chemical bonding between CNTs' outer wall and PbS-QDs, which are thought to be profitable for efficient charge transfer but not for charge transport along CNT's tube axis, are confirmed by Raman spectroscopy and X-ray photoelectron spectroscopy. In the case of double-walled CNTs (DWCNTs), inner tube remains unaffected by ablated PbS species, then it serves efficient conduction way for transferred photo-generated charges. This unique feature of the DWCNTs based nanohybrid, where the photocharges are generated by the chemically bonded PbS-QDs to the outer tube and then efficiently conveyed by the inner tube of the nanotubes, is highly likely at the origin of their significantly higher photo-activity (several hundred times than in SWCNTs-based nanohybrids). (C) 2015 Elsevier Ltd. All rights reserved.</P>