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마이크로볼로미터 응용을 위한 스핀 스프레이로 증착된 스피넬 박막
전창준,이귀웅,레득탕,정영훈,윤지선,백종후,조정호,Jeon, Chang Jun,Lee, Kui Woong,Le, Duc Thang,Jeong, Young Hun,Yun, Ji Sun,Paik, Jong Hoo,Cho, Jeong Ho 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.12
Spinel thin films were prepared by the spin spray technique to develop new thermal imaging materials annealed at low temperature for uncooled microbolometer applications. The spinel thin films were deposited from $[(Ni_{0.30}Co_{0.33}Mn_{0.37})_{1-x}Cu_x]_3O_4$ ($0.1{\leq}x{\leq}0.2$) solutions and then annealed at $400^{\circ}C$ for 1 h in argon. Effects of Cu content (x) and deposition time on the electrical properties of the annealed films were investigated. With increasing deposition time, the resistivity of the annealed films increased. For the annealed films deposited for 1 min, the resistivity of x=0.15 films was lower than that of x=0.1 films due to the different grain sizes. The high temperature coefficient of resistance (TCR) of the annealed films could be obtained at temperature below $50^{\circ}C$. Typically, the resistivity of $127{\Omega}{\cdot}cm$ and TCR of -5.69%/K at $30^{\circ}C$ were obtained for x=0.1 films with deposition time of 1 min annealed at $400^{\circ}C$ for 1 h in argon.
스핀 스프레이 법으로 제조한 망가나이트 박막의 전기적 특성
전창준,정영훈,윤지선,박운익,백종후,홍연우,조정호,Jeon, Chang Jun,Jeong, Young Hun,Yun, Ji Sun,Park, Woon Ik,Paik, Jong Hoo,Hong, Youn Woo,Cho, Jeong Ho 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.1
Effects of pH value and deposition time on the electrical properties of (NMC) Ni-Mn-Cu-O and (NMCC) Ni-Mn-Cu-Co-O thin films were investigated. The NMC and NMCC films were prepared by spin spray method. The crystal structure and thickness of the annealed films were changed by the pH value and deposition time, respectively. A single phase of cubic spinel structure was confirmed for the annealed films deposited from solutions with pH 7.6. The resistivity of the annealed films was affected by the crystal structure and microstructure. The TCR (temperature coefficient of resistance) was dependent on the $Mn^{3+}/Mn^{4+}$. Typically, the resistivity of $70.5{\Omega}{\cdot}cm$ and TCR of -3.56%/K at room temperature were obtained for NMCC films deposited from solutions with pH 7.6 for 5 min, and annealed at $450^{\circ}C$ for 3 h.
0.85NaNbO3-0.15LiNbO3 세라믹스의 구조 및 전기적 특성
전창준 ( Chang Jun Jeon ),정영훈 ( Young Hun Jeong ),윤지선 ( Ji Sun Yun ),남중희 ( Joong Hee Nam ),백종후 ( Jong Hoo Paik ),조정호 ( Jeong Ho Cho ) 한국센서학회 2014 센서학회지 Vol.23 No.2
Structure and electrical properties of 0.85NaNbO3-0.15LiNbO3 ((Li0.15Na0.85)NbO3) ceramics were investigated as a function of sintering temperature. (Li0.15Na0.85)NbO3 ceramics were prepared by conventional solid state processing. A main phase of the orthorhombic perovskite structure and secondary phase of LiNbO3 were confirmed for all sintered specimens. Dense (Li0.15Na0.85)NbO3 ceramics were obtained at sintering temperature above 1050oC. With increasing sintering temperature, the electromechanical coupling factor (kp), piezoelectric constant (d33) and relative dielectric constant (εr) of the sintered specimens increased, while the mechanical quality factor (Qm) decreased. These results are due to the increase of grain size and crystallite size of orthorhombic perovskite structure. Based on the temperature dependence of εr, stable piezoelectric properties were expected because no phase transition found up to 300oC. Typically, kp of 18%, d33 of 34.7 pC/N, εr of 135, and Qm of 62.8 were obtained for the specimens sintered at 1200oC for 5 h.
MOD법으로 제조된 Copper Manganite 박막의 구조 및 NTCR 특성
이귀웅,전창준,정영훈,윤지선,남중희,조정호,백종후,윤종원,Lee, Kui Woong,Jeon, Chang Jun,Jeong, Young Hun,Yun, Ji Sun,Nam, Joong Hee,Cho, Jeong Ho,Paik, Jong Hoo,Yoon, Jong-Won 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.7
Copper manganite thin films were fabricated on $SiN_x/Si$ substrate by metal organic decomposition (MOD) process. They were burned-out at $400^{\circ}C$ and annealed at various temperatures ($400{\sim}800^{\circ}C$) for 1h in ambient atmosphere. Their micro-structure and negative temperature coefficient of resistance (NTCR) characteristics were analyzed for micro-bolometer application. The copper manganite film with a cubic spinel structure was well developed at $500^{\circ}C$ which confirmed by XRD and HRTEM analysis. It showed a low resistivity ($47.5{\Omega}{\cdot}cm$) at room temperature and high NTCR characteristics of $-4.12%/^{\circ}C$ and $-2.15%/^{\circ}C$ at room temperature and $85^{\circ}C$, implying a good thin film for micro-bolometer application. Furthermore, its crystallinity was enhanced with increasing temperature to $600^{\circ}C$. However, the appearance of secondary phase at temperatures higher than $600^{\circ}C$ lead to deteriorate the NTCR characteristics.
이귀웅,전창준,정영훈,윤지선,조정호,백종후,윤종원,Lee, Kui Woong,Jeon, Chang Jun,Jeong, Young Hun,Yun, Ji Sun,Cho, Jeong Ho,Paik, Jong Hoo,Yoon, Jong-Won 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.12
$[(Co_{1-x}Cu_x)_{0.2}(Ni_{0.3}Mn_{0.7})_{0.8}]_3O_4$ ($0{\leq}x{\leq}1$) thin films prepared by metal organic decomposition process were fabricated on SiN/Si substrate for infrared sensor application. Their structural and electrical properties were investigated with variation of Cu dopant. The $[(Co_{1-x}Cu_x)_{0.2}(Ni_{0.3}Mn_{0.7})_{0.8}]_3O_4$ (CCNMO) film annealed at $500^{\circ}C$ exhibited a dense microstructure and a homogeneous crystal structure with a cubic spinel phase. Their crystallinity was further enhanced with increasing doped Cu amount. The 120 nm-thick CCNMO (x=0.6) thin film had a low resistivity of $53{\Omega}{\cdot}cm$ at room temperature while the Co-free film (x=1) showed a significantly decreased resistivity of $5.9{\Omega}{\cdot}cm$. Furthermore, the negative temperature coefficient of resistance (NTCR) characteristics were lower than $-2%/^{\circ}C$ for all the specimens with $x{\geq}0.6$. These results imply that the CCNMO ($x{\geq}0.6$) thin films are a good candidate material for infrared sensor application.
금속유기분해법으로 제조한 니켈 망가나이트 박막의 구조적 특성
이귀웅,전창준,정영훈,윤지선,남중희,조정호,백종후,윤종원,Lee, Kui Woong,Jeon, Chang Jun,Jeong, Young Hun,Yun, Ji Sun,Nam, Joong Hee,Cho, Jeong Ho,Paik, Jong Hoo,Yoon, Jong-Won 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.4
Thin thermistor films of solutions with nickel and manganese oxides were prepared by metal-organic decomposition (MOD). The structural properties of the thin films were investigated as a function of annealing temperature. Field emission scanning electron microscope (FE-SEM) results indicated that the thin films had a thin thickness, smooth and dense surface. The crystallization temperature of $414.9^{\circ}C$ was confirmed from thermogavimetric-differential thermal analysis (TG-DTA) curve. A single phase of cubic spinel structure was obtained for the thin film annealed from $700^{\circ}C$ to $800^{\circ}C$, which was confirmed from the X-ray diffraction (XRD). From the selected area electron diffraction (SAED) in high resolution transmission electron microscope (HRTEM), the nano grains (2~3 nm) of spinel phase with (311) and (222) planes were detected for the thin film annealed at $500^{\circ}C$, which could be applicable to read-out integrated circuit (ROIC) substrate of the uncooled microbolometer with low processing temperature.
윤상준 ( Sang Jun Yoon ),김용구 ( Young Ku Kim ),전창준 ( Chang Joon Jeon ),이재구 ( Jae Goo Lee ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.5
Although biomass syngas is very low calorific gas, it is utilized by means of dual fuel combustion technology in the fields of industrial furnace and boiler as a substitute oil technology. The basic structure of duel fuel combustion burner is designed so that low caloric gas fuel is supplied around an oil burner in the middle. In the present study, three types of mixing burners were manufactured to conduct performance experiment. Low caloric gas was evenly distributed around the oil burner and the method of changing the angle of gas nozzle was applied. CO generation decreased according to the increase of the amount of air for combustion. In addition, the shapes and colors of flame changed according to the proportions of gas and oil used. Remained flame after combustion was from the lack of atomization at the exit of oil burner. Although it was difficult to maintain the optimum air ratio due to different required air ratio for oil and syngas, stable combustion was able to maintained within excess oxygen concentration of 4.7~8.2%. From this study, it was shown that the oil atomization at the exit of fuel oil nozzle was promoted by the increased rate of syngas combustion and the CO concentration in flue gas lower than only fuel oil combustion.