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Characterization of Polycrystalline SrRuO3 Thin Films Deposited by DC Magnetron Sputtering Method
Sanghyun Park,Suk-Kyoung Hong,Ae-Kyoung Lee,Hae-Chan Park,Ji-Hye Choi,Min-Ho Kang,권순용,Sung Joo Hong,Sung Kyu Lim,Sung-Sil Cho,Sung-Yeon Hwang,이완규,Young-Jin Son 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
Polycrystalline SrRuO3 (SRO) thin films were deposited on SiO2/Si substrate by using the DC magnetron sputtering method for application as buffer electrodes in PZT ferroelectric capacitors. The process parameters, such as the substrate temperature, the pre-heating time, the DC power and the oxygen gas ratio, were systematically varied to obtain high-quality SRO thin films. Among the various process conditions, the substrate temperature was a major factor having a significant effect on the electrical resistivity and the microstructure. Regardless of the deposition conditions, the SRO films showed a columnar structure and a highly (121) orientation at substrate temperatures higher than 450 C. The lowest resistivity obtained was about 440 μ ·cm for the 30-nm-thick SRO film deposited at 550 C. The PZT capacitor with the SRO buffer layer showed a very high remanent polarization value (2Pr 60 μC/cm2) and a small fatigue loss (10 %) after 1 × 1011 switching cycles.%
Lee, Sanghyun,Park, Sung-Hyeon,Jang, Kihun,Yu, Seongil,Song, Chiho,Kim, Hak-Sung,Ahn, Heejoon Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.724 No.-
<P><B>Abstract</B></P> <P>Cobalt-based nanomaterials have received considerable attention in electric energy-storage devices due to their outstanding electrochemical characteristics. However, multiple time- and energy-consuming steps and complex reduction processes for producing cobalt and cobalt oxide nanostructures are disrupting their substantive commercialization. Here, we propose a facile, ultra-fast, and versatile method for the fabrication of cobalt and cobalt oxide nanostructures using an intense pulsed white light (IPWL) photothermal reduction technique. The mechanism of the IPWL photothermal reduction of cobalt and cobalt oxide is firstly studied by measuring the in-situ temperature of the Co(NO<SUB>3</SUB>)<SUB>2</SUB>-coated carbon fiber paper (CFP) substrate during IPWL irradiation and analyzing the crystal structures of the IPWL-irradiated samples. Cobalt nanoflakes and cobalt oxide nanoparticles are synthesized on the surface of the CFP substrate by irradiating IPWL for 10 ms at ambient temperature and pressure with various energy densities from 10 to 30 J cm<SUP>−2</SUP>. The Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticle/CFP and Co nanoflake/CFP samples are further utilized as an electrode, and each electrode exhibits high specific capacity of 29 and 73 mA h g<SUP>−1</SUP>, respectively, at a current density of 1 A g<SUP>−1</SUP>. Since this novel photothermal reduction technique is applicable to other transition metals and metal oxides, it is a promising method for not only energy storage systems, but also for energy generation applications, filters, sensors, and catalysis systems.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Facile, ultra-fast, versatile IPWL photothermal reduction technique is proposed. </LI> <LI> Co nanoflakes and cobalt oxide nanoparticles are fabricate on CFP by IPWL. </LI> <LI> The mechanism of the IPWL photothermal reduction of cobalt/cobalt oxide is studied. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The intense pulsed white light (IPWL) photothermal reduction process enables ultra-rapid and facile synthesis of cobalt nanoflakes and cobalt oxide nanoparticles on carbon fiber paper (CFP). The IPWL-induced Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticle/CFP and Co nanoflake/CFP electrodes exhibit high specific capacity, as well as excellent rate capability and cycle stability.</P> <P>[DISPLAY OMISSION]</P>
성상현(Sanghyun Sung),홍순석(Soonseok Hong),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Torque converter in automatic transmission transfers the engine power to transmission by ATF. A Torque converter consists of the hydrodynamic clutch device and the lock-up clutch device. The retaining plate and driven plate are part of the lock-up clutch. Lock-up clutch transfers the engine torque directly to autotransmission. So it must have resistance and durability. In this study, we found the effect from Shape of mechanical stopper on retaining plate. The shpe of mechanical stopper has effect on the stress distribution of lock-up clutch.
ELECTRICAL PROPERTIES OF Pb(Zr,Ti)O3 FERROELECTRIC CAPACITOR ON TiN/W PLUG STRUCTURE
Hwang, Sung-Yeon,Son, Young-Jin,Cho, Sung-Sil,Park, Sanghyun,Lee, Ae-Kyoung,Lee, Baek-Hee,Kim, Yoon-Jung,Park, Nam-Kyun,Park, Hae-Chan,Chang, HEON-YONG,Hong, Suk-Kyoung,Hong, Sung Joo,Choi, Ji-Hye,Kwe Taylor Francis 2007 Integrated ferroelectrics Vol.89 No.1
<P> We investigated the electrical properties of ferroelectric Pb(Zr,Ti)O3(PZT) capacitor on TiN/W storage node contact plug that is capacitor over bitline(COB) cell structure for a high density ferroelectric memory. In order to protecting TiN/W contact plug from oxidation failure during furnace annealing of PZT capacitor, the oxidation barrier of Ti1 - xAlxN (x∼ 0.25) film was interposed at between Pt/IrO2/Ir bottom electrode and TiN/W plug of the COB cell, resulting in the robust contact resistance property of 27 ohm per contact plug after furnace annealing performed at 600°C in O2 ambient for 90 min. The remanent polarization value and leakage current density of the fully integrated PZT capacitor with a top electrode area of 1.8 × 1.8 um2 on TiN/W contact plug showed 32 μ C/cm2 and 2.5 × 10- 6A/cm2, respectively.</P>
동적 거동을 이용한 토크컨버터 댐퍼 충격량 및 강도에 대한 연구
성상현(Sanghyun Sung),홍순석(Soonseok Hong),장재덕(Jaeduk Jang),주인식(Insik Joo),배대성(DaeSeong Bae) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Torque converter in automatic transmission transfers the engine power to transmission by ATF. A Torque converter consists of the hydrodynamic clutch device and the lock-up clutch device. The retaining plate and driven plate are part of the lock-up clutch. Lock-up clutch transfers the engine torque directly to automatic transmission. So it must have resistance and durability. And between retaining plate and driven plate happen impact. To analysis the dynamic Motion of damper system has been carried out using Torque Converter Toolkit made by OPEN API module in DAFUL. This paper is provided torque converter engineer with useful information for stopper impact and stress of damper system.