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바이오센서로 응용을 위한 양극산화알루미늄의 양극산화 온도에 따른 제작 및 전기적 특성
여진호,이성갑,김용준,이영희,Yeo, Jin-Ho,Lee, Sung-Gap,Kim, Yong-Jun,Lee, Young-Hee 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.6
We fabricated the electrolyte-dielectric-metal (EDM) sensor on the base of AAO (anodic aluminum oxide) template with variation of the anodizing temperature. When a surface is immersed or created in an aqueous solution, a discontinuity is formed at the interface where such physicochemical variables as electrical potential and electrolyte concentration change significantly from the aqueous phase to another phase. Because of the different chemical potentials between the two phases, charge separation often occurs at the interfacial region [1]. This interfacial region, togeter with the charged surface, is usually known as the electrical double layer (EDL) [2]. The structural and electrochemical properties of AAO sensor were investigated for applications in capacitive pH sensors. To change the thickness of the AAO template, the anodizing temperature was varied from $5^{\circ}C$ to $20^{\circ}C$, the thickness of the AAO template invreased from 300 nm to 477 nm. The pH sensitivity of sensors with the anodizing temperature of $20^{\circ}C$ showed the highest value of 56.4 mV/pH in the pH range of 3 to 11. The EDM sensor with the anodizing temperature of $20^{\circ}C$ exhibited the best long-term stability of 0.037 mV/h.
이태호,여진호,이성갑,Lee, Tae-Ho,Yeo, Jin-Ho,Lee, Sung-Gap 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.7
In this study, lead-free $(Na_{0.465}K_{0.465}Bi_{0.07})(Nb_{0.93}Ti_{0.07})O_3-0.08MnO_2$ ceramics were fabricated by conventional mixed oxide method. Structural and electrical properties of lead-free $(Na_{0.465}K_{0.465}Bi_{0.07})(Nb_{0.93}Ti_{0.07})O_3-0.08MnO_2$ ceramics with the variation of sintering temperature were investigated. As results of x-ray diffraction analysis, all specimens showed a typical polycrystalline perovskite structure without presence of the second phase. Sintered density increased with an increases of sintering temperature and the specimen sintered at $1,020^{\circ}C$ showed the maximum value of 4.5 $g/cm^3$. The average grain size of the $(Na_{0.465}K_{0.465}Bi_{0.07})(Nb_{0.93}Ti_{0.07})O_3-0.08MnO_2$ specimen sintered at $1,020^{\circ}C$ is about 0.83 ${\mu}m$. Electromechanical coupling factor, relative dielectric constant and dielectric loss of $(Na_{0.465}K_{0.465}Bi_{0.07})(Nb_{0.93}Ti_{0.07})O_3-0.08MnO_2$ specimens sintered at $1,020^{\circ}C$ were 0.252, 741 and 0.043% respectively.
비냉각형 적외선 센서로 응용하기 위한 반도성 YBa<sub>2</sub>Cu<sub>3</sub>O<sub>6+x</sub> 박막의 열처리 온도에 따른 구조적 전기적 특성
이태호,이성갑,여진호,정혜린,Lee, Tae-Ho,Lee, Sung-Gap,Yeo, Jin-Ho,Jung, Hye-Rin 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.10
YBCO thin films on $SiO_2$/Si substrate were fabricated by spin-coaing of an alkoxide-derived precursor and heat treatment. The structural and electrical properties of the YBCO films were investigated as functions of annealing temperature at $600{\sim}800^{\circ}C$. Although YBCO single phase was not synthesized, dense films of YBCO matrix phase and minor second phases have been successfully fabricated at the annealing temperatures of $650{\sim}800^{\circ}C$. Thickness and temperature coefficient of resistance (TCR) of YBCO thin films with annealing temperature of $750^{\circ}C$ were 0.31 ${\mu}m$ and $-2.92%/^{\circ}C$, respectively.
에칭용액의 인산 첨가량에 따른 양극산화 알루미늄 템플레이트의 제작 및 특성
조예원,김용준,여진호,이성갑,김영곤,Jo, Ye-Won,Kim, Yong-Jun,Yeo, Jin-Ho,Lee, Sung-Gap,Kim, Young-Gon 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.7
Anodic aluminum oxides (AAO) fabricated by the two-step anodizing process have attracted much attention for the fabrication of nano template because of pore structure with high aspect ratio, low cost process and ease of fabrication. AAOs are characterized by a homogeneous morphology of parallel pores that grow perpendicular to the template surface with a narrow distribution of diameter, length and inter-pores spacing, all of which can be easily controlled by suitably choosing of the anodizing parameters such as pH of the electrolyte, anodizing voltage and duration of anodizing. In this study, AAO templates were characterized by X-ray diffraction and field-emission scanning electron microscope (FE-SEM). The dependence of the pore size change according to the amount of addition of phosphoric acid, which was used to remove the initial alumina oxide layer, was not observed.