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한재석,손재상,조상은,조용철,김종민,우현석,김연정,INAMDARAKBAR IBRAHIM,김형상,임현식 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.3
Multi-wall carbon nanotube/polyaniline (CNT/PANI) nanocomposite thin films for electrochemical electrode applications are synthesized on flexible graphene-coated indium-tin-oxide (ITO) substrates by using a drop-casting technique. Graphene serves as an adhesion layer between the CNT/PANI nanocomposite film and the flexible ITO substrate. A nanoscale vermicular morphology of PANI films containing well-dispersed CNTs is formed on the surface of graphene. The electrochemical characteristics of the nanocomposite films are investigated in a 0.5-M LiClO4 + PC electrolyte. The electrical conduction of the CNT/PANI/graphene/ITO film is considerably superior to that of a PANI/ITO film. The cyclic voltammogram measurements indicate that the specific capacitance of the CNT/PANI film is 134 F/g which is 11% higher than that (120 F/g) of the pure PANI film. Most importantly, the nominal capacitance loss of the PANI/CNT film (1.2%) is significantly improved relative to that of the pure PANI film (18.1%) after 100 charge-discharge cycles. We attribute the considerably improved capacity retention of the flexible CNT/PANI electrode to the graphene adhesion layer.
Effect of Surfactants on PANI Morphologies and Supercapacitive Properties
김영삼,손재상,주해리,INAMDARAKBAR IBRAHIM,임현식,김형상 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
Surfactant-mediated polyaniline (PANI) samples were fabricated using an electrodeposition technique for electrochemical supercapacitor applications. We investigated the effect of surfactants such as sodium dodecyl sulfate (SDS), polyvinyl alcohol (PVA), ethylenediaminetetraacetic acid (EDTA) on the PANI morphologies. The surfactants act as a template for PANI deposition during the electrodeposition, modifying the PANI morphology. Scanning electron microscope (SEM) images of the pure PANI samples showed a uniform nanocrystalline structure whilst the surfactant-mediated samples showed overgrown cauliflower-like structures. The electrochemical supercapacitive properties (charge-discharge) were studied in a 0.5 M LiClO4 electrolyte. While the capacitance of the pure PANI sample was 240 Fg−1 at a scan rate of 20 mVs−1, it was 199 Fg−1, 106 Fg−1, and 42 Fg−1 for the PANI-SDS, PANI-PVA and PANI-EDTA samples, respectively. The electrochemical stability of the samples was investigated for 1000 charge-discharge cycles by using cyclic voltammetry measurements.
Polyaniline (PANI) Nanofiber Film의 슈퍼캐패시터 특성 연구
김영삼,손재상,주해리,A. I. Inamdar,정웅,임현식,김형상 한국물리학회 2012 새물리 Vol.62 No.4
In this study, polyaniline (PANI) films were deposited onto ITO substrates by using a pulse galvanostatic method (PGM) for growth times ranging from 900 s to 1800 s. The morphology of the PANI film was characterized using field emission scanning electron microscopy (SEM) and was found to have a nanofiber morphology. The electrochemical properties of the PANI films were measured in a 0.5M LiClO_4 electrolyte by using cyclic voltammetry (CV). When the growth time was 1500 s, the highest specific capacitance of the PANI film was sim713 F/g. Its electrochemical stability was measured in the same electrolyte. When the growth time of the PANI film was 900 s, the capacitance loss was sim15 % after 100 cycles. 본 연구에서는 Pulse galvanostatic method(PGM)을 사용하여 ITO 기판위에 Polyaniline(PANI) nanofiber film을 성장 시간을 900초에서1800초까지 변화시켜 가면서 성장하고 슈퍼캐패시터 특성을 측정하였다. 성장된 PANI film의 표면 특성은 Field Emission Scanning Electron Microscopy(FE-SEM)을 사용하여 측정하였다. SEM image를 통하여 PANI film의 표면이 nanofiber로 성장되었음을 확인하였다. PANI film의전기화학적 특성을 측정하기 위하여 0.5 M LiClO_4에서 Cyclic Voltammetry(CV)를 이용하였다. 성장 시간이 1500초 일 때 캐패시턴스가약 713 F/g으로 가장 높은 값을 가졌다. 전기화학적 안정성을 0.5 M LiClO_4에서 측정하였다. 100 Cycle 후에 900초의 성장 시간을 갖는PANI nanofiber film이 약 15 % capacitance loss를 보였다.
대학 교양체육 수업 참여자의 수업경험에 대한 특성이 수업신뢰, 구전수용 및 구전확산에 미치는 영향
김동환(Kim, Dong-Whan),손재상(Son, Jae-Sang) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.2
This study is aimed at inquiring into the relationship between class experience characteristics of college students who participate in college general physical education, and their acceptance of word of mouth, as well as spread of word of mouth, and concurrently to inquire into what role the class trust among these variables played. In order to achieve this research objective, this study selected 400 students who took the general physical education class during the fall semester in the 2014 school year conducted by the universities located in Seoul Metropolitan City, Gyeonggi-do Province, Chungcheong-do Province and Gangwon-do Province using purposive sampling of the research objects. Among the total 400 copies of collected samples, this study selected a total of 378 copies as final valid samples excepting 22 copies which were judged to be not appropriate for research; with these data, this study obtained the results as follows by conducting frequency analysis, exploratory factor analysis, reliability analysis, correlation analysis, simple & multi-regression analysis using PASW Ver. 18.0. First, it was found that class experience characteristics had a positive influence on class trust. Second, the research results revealed that class experience characteristics had a positive influence on acceptance of word of mouth and spread of word of mouth. Third, class trust was found to have a positive influence on acceptance of word of mouth, and spread of word of mouth.
A. I. Inamdar,임현식,김영삼,손재상,김형상,R. S. Kalubarme,박찬진,김대영 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.1
Polyaniline (PANI) thin films were successfully synthesized using the electrodeposition (ED) technique from a mixed solution of 0.2M aniline and 0.2M H2SO4. PANI films with thicknesses of 220 and 250 nm were synthesized. The formation of compact and amorphous PANI films was confirmed with scanning electron microscopy (SEM) and X-ray diffraction (XRD) measurements. The electrochemical supercapacitor properties of the PANI films were examined using cyclic voltammetry and galvanostatic charge-discharge measurements. A specific capacitance of ∼473 Fg^(−1) at 1 mAcm^(−2) in a 0.5 M H_2SO_4 electrolyte was obtained for the PANI electrodes. The electrochemical stability of the PANI electrodes was investigated using cyclic voltammetry and charge-discharge measurements. Both the films were quite stable with 16% capacitance loss after a few initial charge-discharge cycles.