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Magnetic properties of eletrodeposited CoW thin film alloys
Ko, Jang Myoun 한밭대학교 산업과학기술연구소 2001 논문집 Vol.5 No.-
CoW계 박막 필름을 citrate bath에서 전기화학적인 방법으로 제조하여 마크네틱 특성을 조사하였다. 텅스턴 함량은 전착에 사용된 전류밀도에 따라 변화가 거의 없었으나 마그네틱 특성은 전류밀도에 크게 의존하였다. 즉 낮은 전류밀도인 10 ㎃㎝^-2에서는 하드 마그내틱(H_C.// =145 Oe), 높은 전류밀도인 100 ㎃㎝^-2에서는 소프트 마그내틱 (H_C.// =22 Oe) 특성을 나타내었다. 이러한 결과는 CoW 계 합금의 구조적 차이에 기인함을 x-선회절 법에 의해 밝혔다. 즉 낮은 전류밀도인10 ㎃㎝^-2에서는 hcp Co_3W 구조, 높은 전류밀도인 100 ㎃㎝^-2에서는 fcc CoW solid solution이 지배적으로 많이 형성되며, 이러한 상의 변화가 마그내틱 특성에 크게 영향을 미침을 알 수 있었다. CoW thin film alloys have been electrodeposited from the citrate bath to understand their magnetic properties with different current densities at 70 ℃. Deposit tungsten contents were independent of current density while magnetic properties shifted from hard (H_C.// = 145 Oe) to soft (H_C.// = 22 Oe) with increasing a current density from 10 to 100 ㎃㎝^-2. X-ray diffraction data indicated that hexagonal close packed(hcp) Co_3W phase was dominantly electrodeposited at 10 ㎃㎝^-2 while face centered cubic(fcc) CoW solid solution was dominantly formed at 100 ㎃㎝^-2, indicating that hcp Co_3W possesses hard magnetic and fcc CoW possesses soft magnetic property.
( Alfredmadzamuse ),( Jang Myoun Ko ),( Sang Hern Kim ),( Hyun Woo Cho ),( Yong Min Lee ),( Kwang Man Kim ),( Jong Huy Kim ) 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Flexible sheets consisting of acrylonitrile-butadiene rubber (NBR) and vapor-grown carbon fiber (VGCF) are newly prepared varying the composition (VGCF 20-30 wt.%) for use as a current collector of supercapacitor electrodes. The as-prepared VGCF/NBR is then electrodeposited by aniline using a potentiodynamic cyclic voltammetry to yield a polyaniline (PANI)/VGCF/NBR composite electrode. It is confirmed that the electrical conductivity of VGCF/NBR current collector can be enhanced as the content of VGCF increases. Cyclic voltammetry result for the PANI/VGCF/NBR composites shows that the sample with 30 wt.% VGCF achieves a maximum specific capacitance (271.8 F g-1) at 5 mV s-1 and also reaches a superior specific capacitance at high scan rates. Such supercapacitor performance is possibly originated from the synergistic effect consisting of higher polarity of nitrile groups in NBR, conducting pathway of VGCF, and electroactive property of PANI.
Novel supercapacitor materials including OLED emitters
Kim, Seungho,Jang, Kihun,Park, Beom-Soo Michael,Ahn, Heejoon,Ko, Jang Myoun,Park, Jongwook The Royal Society of Chemistry 2016 NEW JOURNAL OF CHEMISTRY Vol.40 No.1
<P>This study constitutes the first attempt to use an OLED emitter material as a novel supercapacitor component. In supercapacitor tests, the specific capacitance (33.07 F g(-1)) of a poly(9-(3-vinyl-phenyl)-anthracene) (PVPA)/multi-walled carbon nanotube (MWCNT) mixture was found to be approximately three times that of the system composed of the MWCNTs alone.</P>