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Howells, Calvyn T.,Marbou, Khalid,Kim, Haeri,Lee, Kwang Jin,Heinrich, Benoî,t,Kim, Sang Jun,Nakao, Aiko,Aoyama, Tetsua,Furukawa, Seiichi,Kim, Ju-Hyung,Kim, Eunsun,Mathevet, Fabrice,Mery, St&eacut The Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.11
<P>We demonstrate that blending fluorinated molecules in PEDOT:PSS hole transport layers (HTL) induces charge transfers which impact on both charge extraction and photogeneration within organic photovoltaic (OPV) devices. OPVs fabricated with modified HTL and two photoactive polymer blends led systematically to power conversion efficiencies (PCE) increases, with PTB7:PC70BM blend exhibiting PCE of ∼8.3%,<I>i.e.</I>∼15% increase compared to pristine HTL devices. A reduced device-to-device characteristics variations was also noticed when fluorinated additives were used to modify the PEDOT:PSS. Shading lights onto the effect of HTL fluorination, we show that the morphology of the polymer:PCBM blends remains surprisingly unaffected by the fluorinated HTL surface energy but that, instead, the OPVs are impacted not only by the HTL electronic properties (work function, dipole layer, open circuit voltage, charge transfer dynamic) but also by alteration of the complex refractive indices (photogeneration, short circuit current density, external quantum efficiencies, electro-optic modelling). Both mechanisms find their origin in fluorination induced charge transfers. This work points towards fluorination as a promising strategy toward combining both external quantum efficiency modulation and power conversion efficiency enhancement in OPVs. Charge transfers could also be used more broadly to tune the optical constants and electric field distribution, as well as to reduce interfacial charge recombinations within OPVs.</P>
Nguyen, Nhung T. T.,Lo, Tien N. H.,Kim, Jaheon,Nguyen, Huong T. D.,Le, Toan B.,Cordova, Kyle E.,Furukawa, Hiroyasu American Chemical Society 2016 Inorganic Chemistry Vol.55 No.12
<P>A presynthesized, square planar copper imidazole complex, [Cu(imidazole)(4)](NO3)(2), was utilized as a precursor in the synthesis of a new series of zeolitic imidazolate frameworks, termed ZIF-202, -203, and -204. The structures of all three members were solved by single-crystal X-ray diffraction analysis, which revealed ZIF-203 and -204 having successfully integrated square planar units within the backbones of their respective frameworks. As a result of this unit, the structures of both ZIF-203 and -204 were found to adopt unprecedented three-dimensional nets, namely, ntn and thl, respectively. One member of this series, ZIF-204, was demonstrated to be highly porous, exhibit exceptional stability in water, and selectively capture CO2 over CH4 under both dry and wet conditions without any loss in performance over three cycles. Remarkably, the regeneration of ZIF-204 was performed under the mild conditions of flowing a pure N-2 gas through the material at ambient temperature.</P>
Nguyen, Phuong T. K.,Nguyen, Huong T. D.,Pham, Hung Q.,Kim, Jaheon,Cordova, Kyle E.,Furukawa, Hiroyasu American Chemical Society 2015 Inorganic Chemistry Vol.54 No.20
<P>Four crystalline, porous metal–organic frameworks (MOFs), based on a new hexatopic linker, 1′,2′,3′,4′,5′,6′-hexakis(4-carboxyphenyl)benzene (H<SUB>6</SUB>CPB), were synthesized and fully characterized. Interestingly, two members of this series exhibited new topologies, namely, <B>htp</B> and <B>hhp</B>, which were previously unseen in MOF chemistry. Gas adsorption measurements revealed that all members exhibited high CO<SUB>2</SUB> selectivity over N<SUB>2</SUB> and CH<SUB>4</SUB>. Accordingly, breakthrough measurements were performed on a representative example, in which the effective separation of CO<SUB>2</SUB> from binary mixtures containing either N<SUB>2</SUB> or CH<SUB>4</SUB> was demonstrated without any loss in performance over three consecutive cycles.</P><P>The synthesis of metal−organic frameworks (MOFs) using multicarboxylate linkers has afforded new materials with unique structural features and interesting intrinsic properties. Accordingly, we prepared a new hexacarboxylate linker, and through one-pot solvothermal reactions, four new crystalline MOFs were constructed. All members exhibited selective CO<SUB>2</SUB>-capture properties, and a representative example was demonstrated to effectively separate CO<SUB>2</SUB> from binary gas mixtures containing N<SUB>2</SUB> or CH<SUB>4</SUB>.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2015/inocaj.2015.54.issue-20/acs.inorgchem.5b01900/production/images/medium/ic-2015-01900p_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic5b01900'>ACS Electronic Supporting Info</A></P>
Tumor Imaging by Monoclonal Antibodies Labeled with Radioactive Metal Ions
( K. Endo ),( H. Sakahara ),( T. Nakashima ),( M. Koizumi ),( M. Kunimastsu ),( H. Ohta ),( T. Furukawa ),( Y. Ohmomo ),( Y. Arano ),( A. Yokoyama ),( K. Okada ),( O. Yoshida ),( S. Hosoi ),( T’ Nakam 대한핵의학회 1984 핵의학 분자영상 Vol.18 No.2
Dynamic PID Gain Changing Control for DC-DC Converter
Y. Furukawa,D. Mitsutake,T. Shirakawa,H. Maruta,F. Kurokawa 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper presents a digital control method where changes PID parameter setting dynamically to improve transient characteristics of dc-dc converters. In the conventional PID control, those control parameters are selected as suitable values to satisfy stable characteristics both in transient state and steady state and keep the stability of system. Therefore, the value of control parameter tends to be a small one. In this paper, we propose the method where the PID parameter setting is changed to the suitable one in the transient state, where the value of control parameter is designed just to improve the transient response and takes larger one compared to the conventional PID control method. Using the proposed method, the transient response can be improved without the loss of stability of dc-dc converter.
Y. Hara,T. Furukawa,K. Mizushima,S. Sato,T. Shirai,K. Noda,E. Takeshita 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
A two-dimensional dosimetry system was developed for the quality assurance (QA) of therapeuticscanned ion beams at Heavy Ion Medical Accelerator in Chiba (HIMAC). This system consists of afluorescent screen and a charge-coupled device (CCD) camera. To evaluate the performance of thissystem, we carried out a few experiments concerning QA procedures. A verification of this systemwas also carried out by comparing the film dosimetry and the ionization chamber array. Also, weverified several types of corrections for errors, e.g., background and vignetting, that distort themeasurement results. As a result, we confirmed that this system could be used for QA proceduresof the therapeutic scanned ion beams.
Beam Spot Imaging System Using a Fluorescent Screen for Carbon-ion Radiotherapy
K. Mizushima,E. Takeshita,T. Furukawa,Y. Hara,T. Shirai,K. Katagiri,K. Noda 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
A two-dimensional (2D) beam imaging system with a fluorescent intensifying screen and highspeedcharge-coupled device (CCD) camera was developed to observe the fluctuations of the beamposition and size. This system can perform imaging of the beam spot and the calculation of bothits position and size from the obtained image with a cycle-time of 20 ms. For quality assurance ofscanned carbon-ion therapy, we measured the stability of the unscanned-beam position and size byusing this system at the isocenter in a treatment room. We confirmed that the fluctuation rangesof its position and size were less than the tolerance for scanning irradiation.