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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.
여진호,이성갑,이성갑,정혜린 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.5
Piezoelectric 0.94(Na0.5K0.5)NbO3-0.06(Sr0.5Ca0.5)TiO3 ceramics were fabricated by the mixed-oxide method and the structural and dielectric properties was investigated with the variation of the sintering temperature. All specimens were crystallized in the perovskite single phase without any formation of a second phase such as pyrochlore. The specimen sintered at 1200 o C showed the highest relative density of 98%. Electromechanical coupling factor, relative dielectric constant and dielectric loss of NKN-SCT specimens sintered at 1200 o C were 0.25, 2028 and 0.03, respectively. Curie temperature increased with increasing the sintering temperature, and the value of the specimen sintered at 1200 o C was 345 o C.
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.
김용준,이성갑,여진호,조예원 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.6
In this study, we fabricated an electrolyte-insulator-metal (EIM) device incorporating a high-k Al2O3 sensing membrane using a porous anodic aluminum oxide (AAO) through a two-step anodizing process for pH detection. The structural properties were observed by field-emission scanning electron microscopy (FE-SEM) and X-ray diffraction patterns (XRD). Electrochemical measurements taken consisted of capacitance-voltage (C-V), hysteresis voltage and drift rates. The average pore diameter and depth of the AAO membrane with a pore-widening time of 20 min were 123nm and 273.5nm, respectively. At a pore-widening time of 20 min, the EIM device using anodic aluminum oxide exhibited a high sensitivity (56mV/pH), hysteresis voltage (6.2mV) and drift rate (0.25mV/pH).
A potential application of anodic aluminum oxide template as substrate of chemical sensors
조서현,이성갑,여진호 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.1
We fabricated the electrolyte-insulator-metal (EIM) sensor on the base of Si3N4 film-coated AAO (anodic aluminum oxide) template for chemical sensors. The average pore size and the thickness of the AAO template were approximately 160 nm and 168 nm, respectively. The outer oxide layer thickness of the bottom part, the interface between the Al2O3 pore and the Al metal substrate, was thicker than that of the side part, and the thickness of inner oxide layer and outer oxide layer of the bottom part were about 24 nm and 30 nm, respectively. The spacing of lattice plane of the oxide layer was about 2.387 Å. The average pH sensitivity was 51.6 mV/pH.
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.