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Preparation of large Cu3Sn single crystal by Czochralski method
Kong Minsik,Park Sang-Eon,Kim Hye Jung,Song Sehwan,Ryu Dong-Choon,Kang Baekjune,Sohn Changhee,Kim Hyun Jung,Kim Youngwook,Yoon Sangmoon,Go Ara,Jeen Hyoungjeen,Park Sungkyun,Jeong Se-Young,Kang Chang-J 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.7
Cu3Sn was recently predicted to host topological Dirac fermions, but related research is still in its infancy. The growth of large and high-quality Cu3Sn single crystals is, therefore, highly desired to investigate the possible topological properties. In this work, we report the single crystal growth of Cu3Sn by Czochralski (CZ) method. Crystal structure, chemical composition, and transport properties of Cu3Sn single crystals were analyzed to verify the crystal quality. Notably, compared to the mm-sized crystals from a molten Sn fux, the cm-sized crystals obtained by the CZ method are free from contamination from fux materials, paving the way for the follow-up works.
Hwang, Minsik,Kang, Jeongmin,Seong, Kwang-dong,Kim, Dae Kyom,Jin, Xuanzhen,Antink, Wytse Hooch,Lee, Chaedong,Piao, Yuanzhe Elsevier 2018 ELECTROCHIMICA ACTA Vol.270 No.-
<P><B>Abstract</B></P> <P>Ni-Co hydroxide nanoneedles embedded in graphene hydrogel are fabricated using an efficient two-step method and further explored as a binder-free electrode for high-performance asymmetric supercapacitors. First, freestanding graphene hydrogel is prepared via reduction in a mild condition. Second, Ni-Co hydroxide nanoneedles embedded in graphene hydrogel are obtained using a simple hydrothermal method. The existence of many hydrophilic functional groups in graphene hydrogel results in the generation of well-dispersed Ni-Co hydroxide nanoneedles throughout the graphene nanosheet. Moreover, the freestanding property of graphene hydrogel allows it to be used as a binder-free electrode, which can improve the energy density of the asymmetric supercapacitor without inhibiting its high power capabilities. The composite shows an excellent capacity of 544 C g<SUP>−1</SUP> at 2 A g<SUP>−1</SUP> in a three-electrode system. Moreover, the binder-free asymmetric supercapacitor achieves excellent performance with an energy density of 32.74 Wh kg<SUP>−1</SUP> at a power density of 320 W kg<SUP>−1</SUP> and good cycling stability with 85% capacitance retention at a current density of 10 mA cm<SUP>−2</SUP> after 5000 cycles. Therefore, the Ni-Co hydroxide nanoneedles embedded in graphene hydrogel have immense potential as electrochemically active materials for the development of high-performance supercapacitors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ni-Co hydroxide nanoneedles embedded in 3D graphene hydrogel were prepared by an efficient two-step method. </LI> <LI> The nanocomposite of Ni-Co hydroxide/graphene hydrogel was used as a binder-free supercapacitor electrode. </LI> <LI> The nanocomposite shows a high capacity of 544 C g<SUP>−1</SUP> at 2 A g<SUP>−1</SUP> in a three-electrode system. </LI> <LI> The asymmetric supercapacitor prepared by using the nanocomposite shows excellent power/energy density and cycling stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The paper reported the Ni-Co hydroxide nanoneedles embedded in graphene hydrogel using facile two-step method. The asymmetric supercapacitor prepared by using the nanocomposite shows excellent energy density and cycling stability.</P> <P>[DISPLAY OMISSION]</P>
아크 융해로를 이용한 β-Ti<SUB>3</SUB>O<SUB>5</SUB> 및 λ-AlxTi<SUB>3-x</SUB>O<SUB>5</SUB>의 합성
공민식(Minsik Kong),김서희(Seohee Kim),김민재(Min Jae Kim),강명준(Myeongjun Kang),지광철(Gwangcheol Ji),박성욱(Seonguk Park),이지성(Jisung Lee),손영준(Yeongjun Son),박성균(Sungkyun Park),옥종목(Jong Mok Ok) 한국물리학회 2024 새물리 Vol.74 No.1
Ti₃O<SUB>5</SUB> exhibits a metal-insulator transition (MIT) accompanied by a structural change from β- phase to λ-phase at 514 K. During the transition, Ti₃O<SUB>5</SUB> demonstrates significant resistance changes and high thermal energy storage characteristics. To harness the beneficial characteristics of Ti₃O<SUB>5</SUB>, it is essential to develop a growth method that yields homogeneous samples and to control the phase transition temperature. In this study, we successfully synthesized high-quality β-Ti₃O<SUB>5</SUB> and λ-AlxTi₃−xO5 polycrystalline samples using an arc melting method. Furthermore, the structural and physical properties of β-Ti₃O<SUB>5</SUB> and λ-AlxTi₃−xO<SUB>5</SUB> were investigated as a function of the Al doping ratio. Our results suggest that the arc melting method provides an effective way to synthesize high-quality Ti₃O<SUB>5</SUB> and control the transition temperature of the MIT.
김민식(Minsik Kim),권지원(Jiwon Kwon),강준영(Junyoung Kang),이진욱(Jinwook Lee),김승열(Sunglyul Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently, particle number concentration emitted by diesel internal combustion engine has focused on attention because the nano-sized particles are suspected being hazardous of air pollution as well as human body. In this study, by using the PPS (Pegasor Particle Sensor) system which can measure nano-particle from engine-out emissions, it is investigated the particle emission characteristic at various diesel engine-operating conditions. The PPS system operates by electro-statically charging particles passing through its body and then measuring the current produced by the charged particles as they leave the sensor. The particles are charged by ions generated by a corona discharge, which is generated around a sharp tip at high voltage. Under the steady state operation of the 2.0L CRDi diesel engine with different operating condition (1000,1500,2000 rpm), the nano-sized particle emission characteristic was measured at the downstream position of DOC system. According to this experiment result, more engine load increases, more particle concentration increases. Also, it has slowly become after installizing DOC.
Min, Minsik,Kang, Dahye,Jung, Sungwoo,Hong, Sungwoo WILEY‐VCH Verlag 2016 Advanced synthesis & catalysis Vol.358 No.8
<P><B>Abstract</B></P><P>Efficient rhodium‐catalyzed direct C–H phosphorylation of (hetero)arenes was developed. Various directing groups and a wide range of substrates, including heterocycles, can be utilized in this C–H phosphorylation process, allowing for the rapid installation of the phosphonate group into medicinally and biologically important privileged scaffolds. The efficient and straightforward method could serve as a new tool to streamline late‐stage C–H functionalization for preparing aryl phosphonates, which are important structural motif in synthetic and medicinal chemistry.</P>